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H: What voltage rating should capacitor be in this LED driver circuit?
I have a circuit that is used to rapidly turn an LED on and off. There is a capacitor in the circuit to provide some buffering (C1). What minimum voltage rating is required when selecting C1? I want C1 to be a through hole component with the smalle... |
H: Is there a best practice for resistor placement?
Resistors are color-coded by digit, multiplier, then tolerance, but the book I'm reading (comes with the Arduino starter kit) shows its breadboard diagrams with all the resistor tolerance bands leftmost, which seems backwards to me. I understand that resistors are no... |
H: How could I read a digital input (an open/closed switch) from a smartphone without a digitizing board?
I have to read a single digital input signal (a trivial open/closed-circuit push button) and use this signal in an Android application on a smartphone.
Of course, I could connect a tiny Arduino-like board to the U... |
H: 8 bit MCU with 12 bit ADC, possible?
I am trying to measure battery's voltage and current but with a very high accuracy. So i've selected a 12 bit ADC to be interfaced (via I2C) with my micro-controller. My micro-controller will receive these values form the ADC and send them to the PC via the USB.
Now my question ... |
H: Given the dynamic and static power consumption how does one determine the total power for the capacitive load?
I get that the capacitive load is determined which is also indicated by this question:
$$\frac{Power}{Voltage^2 \times frequency} = Capacitive Load$$
However, I am not sure how power (which is given in W... |
H: What is this type of radio fm antenna connector called?
I'm looking for an antenna replacement for my dad's busted radio (iHome IH8) and I'm having some trouble finding the name of this type of plug. The only things I find when searching online are coaxial cables and more professional looking cables and nothing rel... |
H: Use a li-ion battery at two different voltages
I scavenged a li-ion battery from a broken laptop. It is made of 6 Samsung ICR18650 cells (3.75V 2800mAh), parallels two by two so that the total pack is in fact the sum of 3 cells at 3.75V, so 11.25V (it's written 11.1V on the pack).
I have a raspberry pi which can ru... |
H: What is the required bandwidth for QAM modulation?
Why is the allocated bandwith smaller with QAM-16 or 64 compared to e.g. QAM-4? I am not a professional so I'm looking for an intuitive explanation.
AI: NxN-QAM means Quadrature Amplitude Modulation and it is a modulation scheme where the transmitted signal is the ... |
H: FPGA floating pins, when place pull-up/down resistor on Input or Output
I've looked my FPGA datasheet and found that there is no pull-up/down resistors on it's pins(just a pull-up but that need to be enabled). So, when I power up my circuit I've for a "big" amount of time all IO pins of my FPGA floating. Since I've... |
H: Where can the detailed requirements for EU Low Voltage Directive compliance be found?
I'm designing an appliance that probably has to comply with the European Low Voltage Directive.
I've been searching for a guide on how to design a product complying with this directive, but I haven't found any.
I've found this doc... |
H: Transistors emitter pin has lowered output
I have a BD135 NPN and BD136 PNP transistor, When i try to apply 5V of power to the collector pin, The emitter pin Voltage output is much lower.
The goal i want to achieve for this circuit is to control when the motor spins by a programmable circuit board which emits power... |
H: microprocessor 6502 addressing scheme
I'm preparing for a test and I currently stuck with the following question.
We have a 6502 microprocessor. For the execution of an absolute jump the jump address with the address high byte (ADH) and the address low byte (ADL) are loaded into the program counter (PCH,PCL).
The q... |
H: "Hot-knife"/Thermal cutter power supply design
I'm undertaking a DIY rope cutter project to avoid paying for the ~$150 store bought ones.
Many resources online told me to use a light dimmer + transformer configuration and I had planned to go a step further and build the dimmer too, using the circuit from this sit... |
H: Using a LS248 7-segment driver, but segments are dim. Can't figure out why
I'm building a project where I want to use two double-digit 7-segment-LED displays (green, common cathode). From what I've read, a shift register wouldn't be able to source enough current, so I decided upon using a SN74LS248N IC (datasheet).... |
H: Poorman's shunt theory
Background
I'm doing a DIY project of bulding a 1kW Induction heater.
in the process I have built a poormans PSU out of a MOT ( and a 50V 25A brigde rectifier. with not even nearly enough of a smoothing cap (2,500 uF from a broken switched psu for my old comp).. but anyway:
Method
I am going ... |
H: Different Voltage Battery Backup Circuit
I saw a circuit on a website to make a backup battery circuit for a rechargeable 12v battery circuit.
However, I don't anticipate regular power outages, so I believe that one non-rechargeable 9v battery will last for more than the life of this project.
I came up with the fo... |
H: Arduino - Controlling 8 RGB LEDs (beginner question)
First time poster here.
I have an Arduino Uno project that will require 8 RGB LEDs to be controlled. They will be turned on and off with pushbuttons, cycling through red, then green, then blue, then turn off. Multiple LEDs will have to stay on together at times, ... |
H: Why does my LCD screen emit sound when displaying black-and-white lines?
I recently discovered this page (epilepsy warning; flashing lights), which displays horizontal black and white lines and animates their thickness. Amazingly, it makes my laptop LCD screen emit an audible continuous squeak that changes in pitch... |
H: Terminating unused unity-gain Unstable op-amp
I am trying to terminate the unused unity-gain unstable op-amp. I have tried to terminate it with the typical unity-gain stable configuration (http://www.maximintegrated.com/en/app-notes/index.mvp/id/1957) and so far in the lab, it seemed to work and gave stable output.... |
H: VHDL 4-display counter on a Nexys 3 (0000 to 9999)
I'm triyng to implement a 4 display counter (0 to 9999) on a Nexys 3. However, when I load the bit file, all displays remain at 0. It seems like variables a,b,c,d; which control individual digits, stay at 0, but that doesn't happen in the simulation. Xilinx throws ... |
H: Toroid Core Selection for Audio Isolation Transformer
I am a newbie. I have attempted to make an isolation transformer with some toroid cores and it worked, but not well. I tried using a "wide band" toroid core and it seemed to have killed a lot of the lower frequencies.
FT37-43
What is a good toroid core to use f... |
H: What is the maximum number of bytes that can be sent through USB-to-serial COM port at one go?
Suppose someone uses hyper-terminal to send a very long ASCII string at a COM port. This COM port is created by FTDI USB-to-serial port cable. The cable used is http://www.ftdichip.com/Support/Documents/DataSheets/Cables/... |
H: Nokia 1616 LCD AVR Issue
I seem to be having a weird and frustrating issue.
I have a Nokia 1616 LCD to which I am displaying images stored on an SD card. Everything worked fine when I was breadboarding it but when I assembled the circuit on a etched PCB, that's when the trouble started.
When I power on the circuit ... |
H: how to get the RGB value of a color using phototransistor or photodiode?
I'm making a color analyzer which can measure Red, Green, and Blue portions of a color (ex: 128,255,0).I'm not supposed to use pre-made color sensors and need 1% ACCURACY.
I used three LEDs - R,B & B to sequentially measure the values. When gr... |
H: calculate battery voltage using pic ADC
I need to calculate battery voltage using my PIC's ADC. My battery voltage is 24V and ADC has a 12 bit resolution, the PIC operating voltage is 3.3V.
I am using the PIC's internal Vref+ and Vref- as reference voltages, ferrite bead (model 1206 ) I don't know the correct val... |
H: Findning the magnitude of the current
Screen shot of the question is given below.
My thoughts
Since the B field into the page is decreasing, and induced current is induced in such a way to oppose that condition. So here I can find the induced E.M.F.Becasue induced E.M.F equals to the rate of change of magneti... |
H: Debouncing a TTL Photodiode Detector
I am designing a photodiode sensor that will sit on a computer monitor and will output a +5V TTL signal if the screen is displaying and image and a 0V signal if the screen is not. The prototype circuit that I built works almost as expected (schematic below).
Prototype Photodiod... |
H: Does a PCB circuit work without soldering the paste?
So the case is simple. I have to tune a Pi antenna matching network (a simple LC filter). That means I have to place and unplace a couple of pasives back and forth until I find out the right pair of values. Even if I do that operation with hot air gun, I am afrai... |
H: Pronunciation of "Gerber"
How is "Gerber" pronounced? By "gerber" I am referring to the type/class of files generated for PCB manufacturing. I could imagine the first "g" being pronounced with a "g" as in "girl", or a "j" as in "jerk".
AI: I believe it is based on the original plotter file format for machines made ... |
H: Current sense in SMPS, how does it work
I've read a couple of application notes where it is stated that measuring current to use that value in the feedback loop helps stability because sensing before the RC net takes a pole away (see http://cds.linear.com/docs/en/application-note/AN140fa.pdf page 11, figure 13). I ... |
H: Q: transistor as a variable resistor for oscillator circuits
this is my first question,
I want to ask a simple question, I searched but couldn't find proper answer, here is my situation; I want to build frequency generator circuit with op-amp oscillator topologies, but I want to control the circuit with ATMega328p'... |
H: AD5933 analogs for 4-terminal measurements
I'm going to do bioimpedance measurements, and it seems that AD5933 chip (http://www.analog.com/media/en/technical-documentation/data-sheets/AD5933.pdf) has many useful features for this. However, every paper on bioimpedance measurement (e.g. Ishai et. al, Meas. Sci. Techn... |
H: 16 channels relay control with 3.3v pins
I'm going to buy two 16 channels relay boards from Sainsmart : http://www.sainsmart.com/16-channel-12v-relay-module-for-pic-arm-avr-dsp-arduino-msp430-ttl-logic.html
I want to control it with a SBC66EC (modtronix.com/sbc66ec.html?sef_rewrite=1¤cy=EUR) which has 32 3.3V... |
H: Altium: PCB routing
I have several questions:
I'm not sure how to deal with grounds or Vcc when routing. So I have capacitors/resistors connected to the Vcc of the FPGA, so I connect it directly to the pin. But how do I make use of the planes? I know that planes are used for Vcc's and grounds routing but can't I j... |
H: Can a PLL work with a sine signal as its XIN?
I need to generate a 150.012MHz signal. I am going to this with a PLL for RF purposes, so I am thinking to buy a 10Mhz osc with a sine output, will this work with all PLLs? as they are digital I'm not pretty sure. Or should I buy an square oscillator?
Thank you in advan... |
H: Calculating Fc (cutoff) of series to RC to ground on inverting input of non-inverting amplifier
Regarding the chosen answer for: How does this OP-AMP non-inverting amplifier work?
The following circuit is given, and it says that $$F_c = \frac{1}{2\pi R_1C_1}$$
simulate this circuit – Schematic created using Circu... |
H: Zedboard Linux Socket Application Error
After creating the linux boot image from the tutorial for the zedboard, I tried creating a socket application to talk to the computer. The Zedboard would be the server and the program in visual studio would be the client. When I try to run the program from the linux command p... |
H: Where can I find VHDL libraries? Is there a library for a PLL?
I heard in the following link that a V4 library about this topic exists, but I'm not able to find it anywere and to understand how to use it:
Look at the last reply at this link
AI: A continuous-time PLL (phase-locked loop) is an analog circuit and cann... |
H: Correct graph for induced E.M.F
Screen shot of the question is given below.
What I know
B field acting on the Ferris wheel is given below,
And induced E.M.F initially is zero , therefore I can neglect answer number one and two.
But how to proceed further. I am simply stuck .
AI: The EMF that will be induced in t... |
H: Question about a phone wall adapter and it's current output
My phone charger (Male wall adapter to female USB) says it outputs 5V @ 2A on the back. I want to use it to plug a Male USB into.
I guess my question is; is that 2A always being output? Or is it a maximum of 2A?
I have a homemade project, that is simply 10... |
H: Help identifying ceramic disc capacitor
I have a blue ceramic disc capacitor and I'm trying to work out the values. On one side of the disc are the following characters, in approximately this pattern:
SHM
X 1400-
Y 1250-
E 222M
F
The other side has a bunch of logos and symbols which I can't make out. I imagine... |
H: Does resistance matter when charging devices
I've been searching all over the web and couldn't find a simple answer to my question. Partially because I'm no electrical engineer, so I really need a simple and direct answer.
My question is if you have a portable battery with the same output voltage as the input volta... |
H: Is it feasible to synthesise sound with analog circuitry these days?
A friend of mine who is a layman in terms of electronics asked me to teach him how to synthesise audio with some analog circuit and how to build it. For some reason it has to be analog. Probably because that's so cool these days. I don't really ge... |
H: Can a high current trace be on outer and inner layers at the same time?
EDIT, COMMENTS:
TL;DR: Data doesn't conclusively suggest you can do this, but it seems to be worth trying.
The data from IPC-2152 (more in the answers below) is intriguing, but doesn't seem to conclusively say that what I'm proposing is possib... |
H: Output from amplifier is clipping
I have the following circuit and I want to process the output of the op-amp through an ADC. However, as you can see in the picture the signal is clipping at 1.89 Volts, rather than 3Volts. Why is it doing that? Does it have to do with the biasing of the amplifier?? The signal I app... |
H: What happens to unused power in generators
I have a 7KVA generator which i use for multi-purpose. Some times i run AC on it and some times not. Will the generator consume less fuel when i utilize less power generated from it?
Thanks
AI: Yes and it will consume more fuel when you load it.
There should be some mechan... |
H: How do I change the frequency of this Vibrato-Circuit?
I am currently looking at an old 60's Transistor Organ (Phillips Philicorda GM752 to be exact). It has an integrated Vibrato-Unit, although the only modifyable parameter of it is the depth (amplitude) of the Vibrato. My question is: Is there a way I can integra... |
H: Cut Off Frequency in three phase LC filter
Good afternoon all
My question is what will be the formula to calculate cut off frequency of attached LC filter.
Its a three phase LC filter.
\$(L1=L2=L3= 6.1 \mathrm{mH}) \;\mathrm{and} \;(C1=C2=C3=29\mathrm{uF}). \$
I know formula for single phase LC filter is \$\dfra... |
H: Confusion around a components pins
I'm looking to use a RBO40 reverse battery & over voltage protection. I was unable to find the RBO40-40T (with 3 pins) anywhere so had to get RBO40-40G, which is slightly different, it has the middle GND pin cut and the data sheet says this goes to the TAB instead.
I'm not really... |
H: How to select proper capacitors and capacitance for LM78xx voltage regulators?
I want to use LM78xx voltage regulators for various projects. I want to know in general, how should I choose a correct value for input and output capacitors of LM78xx family when I want to change DC to DC (without a need to think about t... |
H: Parallel TRIACs driving same load
I am designing a series of heaters. One of them, actually, is designed for 220V and uses two resistors on series to achieve the power desired. The total current is, on peak, almost 20A. To keep the compatibility with others machines, and based on a lot of other things, the TRIAC wh... |
H: Why is input offset voltage so bad? (op amps)
Take a typical application of an op amp - a photo amplifier:
In the circuit above, since input offset voltage is a dc characteristic, it is modeled as a dc source near the inverting pin of the op amp. This representation of offset voltage is also traditionally seen in ... |
H: Why is only MOV allowed for surge suppression according to IEC 60950-1
IEC 60950-1 prescribes that if a surge suppressor is used in a primary circuit it "shall be a VDR". The document informs that a VDR is sometimes referred to as a "varistor or a metal oxide varistor (MOV)".
It further explicitly states that "gas ... |
H: Circuit to solve algebra problem?
I am trying to get the hang of op amps and have a few questions about circuits that solve algebra problems. I would like to solve two problems where \$X\$ is an input voltage and \$Y\$ is an output voltage. The two (independent) equations are:
$$Y=X/10+11$$
$$Y=X^2$$
For the firs... |
H: Crystal PCB track
This is my current PCB crystal set up. The crystal run at 16 Mhz. Any thoughts/comment?
Links:
MCU - Datasheet
TI PCB guideline Tiva C - Here
AI: My comment would be, What is your total trace Length, it is looking maybe a bit long? From the PCB Guideline:
3.7.2 Crystal Oscillator Circuit Layout
... |
H: Unidentifiable cable socket
Hi looking for a manufacture part ID which matches the socket in the pictures attached.
Measurements are:-
inner black plastic diameter 12.5 mm
outer metal case 14 mm
metal screw nut (for connecting to the plug) 16 mm
It is a 3 pin connector with '1 2 3' written on the inner black plast... |
H: Is circuit design based on min/max values good practice?
Time and again I am arguing with a colleague of mine about the question above. When I design a circuit for mass production (> 10k/a) I want to make it robust against every possible variation of component parameters that I know about. This means for example:
... |
H: Understanding the CNY70 Reflective Optical Sensor
As far as I know, TM4C123 LaunchPad safely accepts voltages values up to 3.3V . I got a CNY70 reflective optical sensor and want to connect it to one of the analog input ports safely as in the attachment. (each of +5V comes from 5V AC to DC adapter)
The main proble... |
H: VHDL parallel execution of statements using variables
If a, b, c and d are variables, then this does not execute in parallel:
a := b;
c := a;
But what about the following:
a := b;
c := d;
Do these statements run concurrently or sequentially?
AI: When there is no dependance between two assignments in a VHDL proce... |
H: How to prevent or detect counterfeit parts from distributors and manufacturers?
I am brand new to EE/ECE. My understanding is that, with distributors, you do pay a premium on the parts you order from them, but bundled with that premium is some kind of protection against counterfeit/non-functional parts. Whereas, wi... |
H: Having trouble implementing a 1Hz blinking light on a Spartan 6 FPGA
I currently have a Spartan-6 FPGA in a Digilent Nexus 3 board.
I am using Xilinx 14.6 Project Navigator to write the code and program the FPGA.
My code for the top (and only) module is the following:
21 module blinker(
22 input clk,
23 output reg ... |
H: Testing paradigms for consumer electronics
I am brand new to EE/ECE (my background is software) and I am curious about how real-world electronics testing takes place.
In software, there are many different types of tests that a piece of code should be run through to make sure it's of high quality and that it is func... |
H: Confusion between register size, address size, data size
I started learning about pointers in C++ and I figured I should educate myself a bit on how memory works and is accessed. I read that when we say a processor is 64-bit, it has a 64-bit register and can access 2^64 address locations. I also read that it can fe... |
H: What is the official name for these jumper wires?
What is the official name for the kind of prototyping wires seen at this link?
I noticed that on this thread the above kind of wire (with the "square" end) was referred to as a "jumper wire". Some other sources refer to the ones with a "round" end as either a jump... |
H: Alber E-Motion M12 power assist: materials required to convert NiMH rechargeable 24V/6Ah circuit (20 C-cell) to Li-Ion rechargeable circuit
Below is a picture of a battery shell for a NiMH circuit for a power assist wheelchair battery. I'm taking a guess that each of the 20 batteries is 1.2V because the entire cir... |
H: Is there an audio amplifier chip or circuit that amplifies certain amplitudes in a signal less or more than other amplitudes?
Like for instance, that would amplify on an exponential curve where the lower amplitudes get the maximum amplification and the highest amplitudes would get no amplification?
Is there an anal... |
H: ATtiny861A: ADC reference voltage should be 1 Volt under AVcc?
I just faced with that ATtiny861A datasheet forcing me to use analog reference voltage to be at least 1 Volt under analog supply voltage:
Let me doubt this datasheet statement for two reasons:
ADC should (and will as I tested) work with reverence volt... |
H: NMOS and PMOS current sources
I'm really confused with the representation of PMOS device shown in the figure. Since conventional current direction in PMOS is from source to drain, shouldn't the current source be pointing upwards(from node Y to VDD)?
AI: Simplest way to remember current direction is by the little a... |
H: 2.4GHz antenna feed routed through pcb via?
I'm working on designing a BLE device, and have settled on using a chip antenna. It seems, however, that my BLE SoC is going to have to be on the underside of the board, which might be significantly more shielded?
If that is the case, is it possible to route the antenna ... |
H: Implementing a safety lockout through ladder logic
The family fireworks show has become my soon-to-be brother in law's and my "thing" over the last couple of years. We have some ideas to make the show better next year, my part is spinning up some automation hardware.
SW1 will serve as a master power switch for the ... |
H: How would you jerry-rig an android phone for continuous autonomous operation?
I want to use an android phone as dash-cam with GPS tracking capabilities.
It is supposed to run 24 hours a day, 365 days a year.
If the phone / app hangs, the user cannot be expected to troubleshoot it. (This is the most important requi... |
H: are sensing power supplies and switching power supplies the same thing?
What is the difference between sensing power supplies and switching power supplies? Are they the same thing?
AI: "Sensing" power supplies are generally referred to as "remote sensing power supplies" and are used to good advantage when the load ... |
H: Making LM78xx fail safe against short, open, reverese bias, flyback, etc
I want to use LM78xx for various applications. What I am concerned about is its failure modes.
1. Failure to Short
Not shorting Vcc to ground!! I mean shorting V_input to V_output.
Assume that you have a delicate and expensive piece of electr... |
H: Of what real, practical use is electronics certification?
I am brand new to EE/ECE and am aware that companies such as UL offer a gammit of services such as:
Circuit verification (they verify your schematic does what its supposed to do and doesn't have any design smell to it)
Circuit testing (they verify the funct... |
H: Running an LED blinking program on cc2530
I am trying to use the following code for blinking LED on CC2530, it would be great if someone could tell me what I am doing wrong? I know this is basic stuff but I cannot figure out what I am doing wrong! The LED is mapped to port 0 and 7th pin (06).
I am using IAR to de... |
H: Make 5v 3A dc power supply
i want to make 5v dc supply so that i can run 3 dc motors in parallel having spec 5v each and max currrent rating 900ma.but i have transformer of 3amp step down transformer 220v to 12v to run lm7805 ic whose max load current is 1A. please tell required spec of capacitors and circuit. if n... |
H: Placing covered vias routing signals under microcontroller termal pads
Placing covered vias routing signals under microcontroller termal pads is a good practic? I mean to reduce soldered termal pad area to center(connected with vias to gnd) and place covered(with soldermaks) signal vias in the inner corner of IC pa... |
H: what is the purpose of this device>
I have this device out of an old laptop, and I have no idea what it is. there is a tiny tag that says something about RFID, and it has 4 wires going in. There is a coil of some sort, but most of the PCB is covered by foam. The original placement was adjacent to the touch pad mou... |
H: MOV characteristic
I am referring MOV characteristics attached as shown below:
As per it's characteristics,
"The conceptual sketch above shows the current I through an MOV is as a function of the voltage V across the MOV. Below the threshold voltage Vth, we see leakage current. Above Vth, the MOV switches to high ... |
H: How would a device determine if it is imeresed in water
I recently bought a really cheap remote control boat. It only turns on when it is placed in water. I would like to know how it determines if it is placed in water. I could not find any sensors that detected fluid in the boat. How does a device know if it is in... |
H: generating sine pwm in orcad pspice
I am trying to design a PWM inverter in Orcad PSPICE where i am using a Vpulse source from library to generate MOSFET triggering pulses for H-bridge and it works fine for square waves.
But i if i want to generate sinusoidal pwm to drive the h-bridge how can i accomplish it in o... |
H: LCR Meter Measurement
Good Morning All
I have a DC link Choke ( Common EI Core), When measuring through LCR meter It gives me reading (see table.). When Adding Inductor in Series ( Pic 3 and Pic 4) it Give the value that is not expected. I am referring formula to calculate inductor in series Leq=L1+L2+2Sqrt(L1*L2)... |
H: Replace Transistor with Mosfet?
I am using a circuit to drive high voltage display tubes (170V DC, 3mA).
Currently, the tubes get switched by an arduino. The output pin is hooked up to a MMBT42 transistor and a 10kOhm base resistor.
I want to use a PCB, with 80 of those lamps. So I need at least 80 transistors and... |
H: Can I use a transistor to switch to battery backup power when main power goes out?
I am putting together a circuitry, and I want the circuit to continue running even after main power goes out. So I was thinking about this idea of using a PNP transistor and a one-way diode to possibly wire up a 9V battery backup. My... |
H: I2S interface using LPC2138
In my application, I am using LPC2138 controller and TI's TLV320DAC3100 DAC with built in amplifier to interface audio data.
To implement I2S interface using SPI, some extra hardware circuitry needed which I found from below link:
http://www.ti.com/lit/an/slaa449a/slaa449a.pdf
From above... |
H: Thermal pads under IC, how to place vias without soldermask / Decoupling question
I'm looking for a good solution on how to design a thermal pad that is good for solderpaste assembly.
PCB fab that I'm using can't place any soldermask on vias like in this example:
And I'm not practic to design this pads. As I read ... |
H: Gain of filter is higher than calculated - why?
I have this circuit:
simulate this circuit – Schematic created using CircuitLab
The op-amp is being run off 15 and -15V supply rails, and I am using a signal generator to input a sine wave of different frequencies with an amplitude of 2V, then using an oscilloscope t... |
H: fpga clock muxing
We are using an fpga with limited resources, the IGLOO Nano, so to implement all our functionality, we need to share a FIFO between two different vhdl components, which are using different clocks.
The functionality is as shown below:
DATA(SCLK) -->|------| |----------|
|... |
H: Adding 90 ohm resistors to DIY USB cable?
I just started with electrics a few months ago, but now I am obsessed but still have MUCH to learn. What I am doing is essentially trial and error.
I needed a longer USB cable to a printer so I took a USB cable I had, cut it close to each end of it and then took the thickes... |
H: Build a solar panel nimh charger
Today I found this tutorial on how to build a battery/solar power supply for an arduino here. The tutorial explains on how to use NIMH or Lithium-Ion batteries for this. Step 4 explains how to use NiMh batteries which is what I prefer. The tutorial explains I have to connect the sol... |
H: Ceiling speaker has 3 wires
I recently bought this ceiling speaker (http://www.3acctv.com/upload/uploads/Specification/T-103C.pdf), as shown in the PDF it has 3 wires attached to it. I am no expert in this, so I was wondering if someone could help explain the difference between the 3 wires.
I do understand the con... |
H: Voltage drops when a signal is fed into op-amp comparator
I have a function generator SFG-2110 from GW Instek. I set it to generate a square wave with max/min of aroudn +- 1 V. And I checked with an oscilloscope.
However, when I connected outputs of the function generator to an op-amp comparator with TL972IP from ... |
H: High Power RGB Led control
We have got a 20W led ,RGB from a good seller in China.
I have a few questions regarding the led (see the attached image)
Is there a data sheet to this Leds? something generic ?
How can you know where are the RGB pins, and the voltage pins ?
I tried to understand how are the control line... |
H: How do I increase the signal to noise ratio in a true condenser microphone?
I made a simple condenser mic as a test project for something more functional. However, when I connect my microphone I only hear the mains hum. Using a factory-made condenser I hear the mains hum except I am also getting a decent signal. I ... |
H: Automatically switching from battery to DC wall adapter on insertion
I have a project that runs off a 4S LIPO battery and I want to switch to 24V wall power when I plug in an DC wall adapter. I have two designs, an inexpensive one with discretes and one with an expensive LTC4412HV IC.
I simulated both and they see... |
H: ADC samples half frequency
I'm using a dsPIC33F (Microchip) to sample a 555-timer signal. I've tried square, triangular, and "sinusoidal" signal shapes, but always have the same problem: the ADC samples the waveform correctly, but the result is always half of the expected frequency.
For example, my input is 440Hz, ... |
H: How Do I Set The Bitclock in a Make File for AVR?
I'm following Chapter 2 of Elliot Williams' book Make: AVR Programming. I'm on an iMac.
I get a success message in Terminal when I input:
avrdude -p m328 -c usbasp -v -B 10
So, I know that my programmer and micro controller are working.
(If I don't set the Bitclock... |
H: Why Does the And Gate have Two Transistors on Top?
Wouldn't the left-side part of the diagram function as a nand gate without the two transistors at the beginning? Why are they part of the diagram? Because in the following picture of a nand gate, it's not an issue.
AI: If the upper two FETs weren't there, then when... |
H: What is a "button load cell"?
I just came across this little gadget called "button load cell", it seems to be a sensor that can measure weight but what exactly does it do? What is its intended application? I do not even have an idea about how to install it correctly(nipple facing upwards?).
This is the one I have b... |
H: How would adjusting the bias on an op amp effect the signal?
I am using an op amp to boost an audio signal. The bias, it appears, is typically half of the input voltage. What kind of effect would it create if the bias was to be adjusted up or down? Would adjusting the voltage up cause it to clip sooner? What if it ... |
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