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VHF interference
Many of the tricks to reducing radiated RF also help to reduce received RF. Probably the easiest to implement is a metal box, and a capacitor to ground on all wires entering the...
Wednesday, 23 March 2011 - 18:59
Adjustable voltage regulator (TC1174 device) questions
Vout is essentially a DC value. Once C1 has charged, it plays no further part in power dissipation in the circuit. The adj terminal is a high impedance input. The current into and...
Monday, 14 March 2011 - 17:42
Different RF waves for different places(?)
Perhaps the reason people have been having so much difficulty answering your question is because there isn't a simple answer to 'which frequency is best' for any give application...
Sunday, 13 March 2011 - 21:32
Help required using optical Quadrature Enocoders
A quadrature encoder provides two outputs, A and B. As the shaft rotates, these outputs provide two square waves, 90 degrees out of phase. Which one is leading is determined by...
Wednesday, 9 March 2011 - 20:14
Problem supplying stepper motor from 12V battery
You might want to look into using a dedicated stepper motor driver chip. The Allegro A3982 is one example. It has a built in PWM function to limit the motor current, which lets...
Wednesday, 2 March 2011 - 19:21
AVR/PNP transistor issue
You need to make a couple of changes to your circuit. first, as mentioned, you need to put a resistor in series with the base of the transistor. without it, when the AVR pin goes...
Wednesday, 2 March 2011 - 19:12
Problem with autorouting in eagle..!
Another thing that's going to need fixing. C4 is labeled as a 100uF capacitor, but the board layout is for a small ceramic capacitor. It's unlikely that a 100uF capacitor will fit...
Wednesday, 2 March 2011 - 16:26
Decoupling Capacitor on Vcc Pin
Quote:That should be 100nF per supply pin, not per chip. That makes sense. I don't often deal with chips having multiple supply pins
Friday, 14 January 2011 - 19:05
Decoupling Capacitor on Vcc Pin
Can you get away without decoupling caps? The quick answer is 'maybe.' The problem has to do with the way digital circuits are designed. The typical 'totem pole' output has a pull...
Friday, 14 January 2011 - 16:06
Led Matrix Circuit
As has been mentioned, you are missing a whole lot of information, but I'll take a try at it anyway. The first assumption I'll make is that you are using LED modules that use an...
Thursday, 18 November 2010 - 18:39
Synchronization PWM on ZeroCrossing
Trying to use PWM to trigger a triac is a waste of time. the very first pulse from the PWM system will trigger the triac. Once triggered, it will remain on until the next zero...
Friday, 10 September 2010 - 21:07
[solved] 12V halogen light dimmer
A couple of possible things to check. First of all, you say you're using a power supply from an old computer. Take a voltmeter, and measure the voltage between the 12V+ and 12V-...
Tuesday, 31 August 2010 - 19:18