Also pins 2 and 4 on IC1 are not connected to ground but a different "net" in your Eagle schem, and are not grounded on the board. Both should be grounded. Just managed to nip home and after a quick hack to link those IC pins to earth its working like a charm! Thanks so much, again! :D I had LM386-...

Also pins 2 and 4 on IC1 are not connected to ground but a different "net" in your Eagle schem, and are not grounded on the board. Both should be grounded. Ah amazing, great spot! I've done a really duff job with this layout it would seem! ;) It's only my third attempt at laying out in Eagle and my...

I tried -1, -3 and -4. You should see/hear clipping on the output from the first IC and the second IC in each case. Theoretical gain on stage 1 is 200 so anything over 45mVpp--an open power chord will do that--at the input should cause it to clip noticeably at the output. Did you add a current limi...

So had some progress, realised one ground pad on the board wasn't actually connected to ground! I've not got signal coming through but there's no distortion, just a loud clean sound. I'm using LM386N-3 ICs, wondering whether that could have anything to do with it?

I've just populated a board from OSH that I laid out using the schem I posted earlier in this thread but I'm just getting a horrendous loud buzzing noise. I suspect it's a grounding issue perhaps but can't see anything obvious after checking parts orientation etc. Had a quick go with an audio probe ...

johnk wrote:yours is the schematic that I used to make & etch my PCB, so yes.

Just noticed you have an extra cap on your layout, was that some extra power filtering at a guess?

johnk wrote:yours is the schematic that I used to make & etch my PCB, so yes.

Perfect, thanks John, I appreciate it!

[quote="johnk"]I just finished mine. it's in a 1590A & I added a gain control. IMO, it's 1000X better with it and it sounds MASSIVE!: http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/AcapulcoGold/AGold-01.jpg That looks great! I'm thinking about doing a board for this, is the schematic I dr...

So are we saying like this?

Also forgot to mention the pot is A100K, not linear as the PCB would have you think. I guess the pot taper depends on location, in this case I'm guessing that it's linear as the code in the US is B for that, the pot itself could be the Euro designation of linear though, which is A. Would seem odd t...

Amazing! Thanks a lot Dan! Here's an updated schem based on Dan's pics; https://dl.dropboxusercontent.com/u/42206482/Acapulco%20v4.png Still not 100% sure I have the layout correct, specifically the two caps and resistor between the ICs but we at least have the values, if anyone can verify that woul...

Tried it with LM386 N-1 and JRC386D now. Both sound quite a bit better. Less flatulent. Ditching the 10uF from pin 1 to 8 also seems to cool down on the craziness, but I still find that using just one chip with caps in and out sounds a whole lot nicer. Softer, surely, but better. So it wasn't for n...

captain_tango wrote:Sorry just came to think: does it matter at all which kind of 386 I'm using? Mine is the LM386L, but I see there's an "N" available too and earthquaker are using the JRC386D... Am I on the wrong chipmobile here?

Possibly relevant;

https://www.diystompboxes.com/smfforum/i ... ic=94327.0

Put it on breadboard. The circuit works, but we knew that already. Whether or not it's the same, I can't tell. I only ran it through a Micro CUBE with a cheap headset, but from what I could tell, it had copious amounts of volume, but not a very nice tone (At least going from what we know and just a...

Hi there, Not sure if anyone is following this thread but I'm attempting an Eagle layout for this and wondered if anyone could cast a critical eye over my schem? I've followed the schematic earlier in the thread so should be ok but sometimes it's hard to see the wood for the trees! ;) https://dl.dro...

I don't ever post here (actually I think this is first post), but I'm intrigued by the concept of having a low parts count single "Power Amp Stage" to put as a tail end on stuff, so I ordered up some 386s and will be breadboarding and doing some research when the package from Tayda shows up in a we...

Here's the schem as I have it currently, anyone up for verifying at all? Obviously there are values missing for some of the caps!

Found a bigger pic of the trace side;

R1 shoul be a 1M. But reading 5 bands resistors value (in particular since they are 1/8 watt) is difficult. I watched a video of the pedal... not bad, I expectet more distortion. The nice thing is that it should serve as overdrive and also power a small speacker. Cool thanks, I've updated my schem,...

Thanks for the replies! I think you're right, pins 1 and 8 do look tied via that electro, I've tried to update my schem to show that along with some values I've worked out. This schem includes all the components I can see in what appears to be how they are laid out on the board, what do you reckon? ...