GREER SUCKER PUNCH

[djmiyta]

In such a small circuit I cant understand why I can't bias the only transistor in the circuit. I get it to Bias to 4.6v but I have to have all pots maxed and hit the string pretty hard to get a sound thats farty and dies out in less than a second I've tried both a mmbfj201 and a through hole j201 with the same results
Anybody had a similar issue biasing 1 transistor in such a small circuit
Heres the layout and pics of my build

Greer Amps Sucker Punch

The Sucker Punch uses the popular combination of a JFET and 386 op amp, much like the Lovepedal Black Magic/Purple Plexi, or DAM Sonic Titan...

effectslayouts.blogspot.com

 

[djmiyta]

more info? I'll give what I got. I'm at a loss here since I can bias the jfet as why it sounds so shitty.

 

[Laundryroom David]

I’ve had weird problems with different 386 versions in different circuits. Wondering if trying different 386 might help

 

[djmiyta]

Building Acapulco Gold I tried different chips and your right the ones that worked well for me were the 386D (I’d have chk to be sure which one but at the time I had A few different ones Completely forgot cause one I did pick really stood out but I think it may have to do with the J201 maybe my trimmer since I seem to get a millisec of a millisec of something that could sound good If It could be dialed in on the trimmer……….maybe

 

[djmiyta]

I think you're on to something there with the 386

Down in the comments here

Nick Greer Sucker Punch

Collection of vero (stripboard) & tagboard layouts for 100s of popular guitar effects, with over 1000 verified designs. DIY your own boutique effects!

tagboardeffects.blogspot.com

Thanks for the headsup

 

[Laundryroom David]

I think you're on to something there with the 386

Down in the comments here

Nick Greer Sucker Punch

Collection of vero (stripboard) & tagboard layouts for 100s of popular guitar effects, with over 1000 verified designs. DIY your own boutique effects!

tagboardeffects.blogspot.com

Thanks for the headsup

No problem, hope you sort it out! I am curious

 

[djmiyta]

No problem, hope you sort it out! I am curious

Well so far I’ve tried a 386M and a 386D the 386D was slightly better but still farty with no sustain and you gotta hit the string hard to get a sound. The suggested chip being a LM386-4 no telling when I’ll get any but I’ll update when I do (I also swapped the thru hole J201 with a mmbfJ201 with no noticable difference ) both biased to needed voltage and then adjust by ear and found no usable range