On Tue, 30 Nov 2004 08:01:25 -0800, Vic Rosenthal wrote: > 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.
Thanks Vic, That's what I was doing, however, because anything capacitive slows the rise of the 5A rail, and hence the correct MCU initialisation, I was chasing my tail. A better solution has presented itself. 73 Stewart G3RXQ _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
