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what'd i do wrong?

Started by PurpleTheory, May 30, 2005, 01:53:35 PM

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PurpleTheory

Hey guys,

I tried to make my own layout for an RRR little gem mk2, here's a link to the schematic:
http://www.runoffgroove.com/littlegemMK2.png
, and here's my layout:
http://home.comcast.net/~knowitallrocks/temp_images/little-gem-mk2_help.gif
So i got it all soldered up and plugged it in and all it does it make a high pitch squeal. The schemo calls for a 0.05uF cap, but i used a 0.047uF, which is the only part substituted. I've looked over my layout a bunch of times and can't figure out what I must have done wrong. note- on my layout sw1a/b and sw2a/b are the switches for gain boost. i thought that maybe you guys could help me spot my errors. thanks in advance for any help at all,

matt

B Tremblay

You've got the .047 µF / 10 ohm network connected to the wrong pin of the left-side 386.  It should go to pin 5 (output) not pin 6 (+V).
B Tremblay
runoffgroove.com

PurpleTheory

cool, now it works!

:P thanks,
matt