Stewart Baker wrote:
The amplifier only draws about 1mA, however because of noise on the 5A line,
mainly from the LED bar graph I have had to heavily decouple the pre-amp supply
to stop the noise from being superimposed on my speech.
What I think is happening is that this decoupling is affecting the rise time of
the 5A line which is used for the MCU reset amongst other things.
Why don't you do this (must be viewed in fixed width font):
5V -------\\\\\\\----|----> to preamp
large R |
---
--- cap for decoupling
|
---
///
You will get better decoupling and isolate the capacitor from the 5V rail.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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