'Please help with basic problem!'
I'm in need of some help. I have a PIC that produces PMW
output hooked up to a resistor and a cap. The problem is that
I need to control an external power source (a 9v batte
be able to adjust its voltage. I thought of using a
transistor but what part # should I use to get the best
results? Also is there anything else I'm missing? The output,
once filtered, gives 0-5v. Thanks in advance. Here is a
PWM output (0-5v) 4.7k (tranistor?) [
--- 0.47uF (ground)
What is the frequency of the PWM? The 3dB cutoff frequency of your 4.7K,
.47uF components are 1/(2 PI R C) = 72Hz. So if your rate isn't fast enough,
the transistor (common collector/emitter ?) will just amplify your
pulses/ramp. What resistants/type of load do you have?
Someone posted a SPICE faq on sci.electonics, which may help in simulating
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