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Can I be a bit pedantic here for the sake of learning? SMT is the method of attaching SMD components to the board.

That is all. Said with love. I'll see myself out.


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Just because I don't know the specific answer have you considered socketing it and seeing if it matters?


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Hello people ... Never mind my whining hahaha. 
I had a go at the "EHX" Lizard Queen. Just added an input pot to simulate guitar volume roll off.
Laser etch. And all (the little) I know about pcb design is thanks to storyboardist's eagle tutorial, so thanks again mate.
BTW .... Should I give Fusion 360 a go or what other cad has the fastest learning curve coming from Eagle?
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I'm giving kicad a go. And the learning curve is strong. If you give fusion a go let me know. I just hate the idea of a subscription service.


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Well done newb! Welcome!


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Oh dang. That's clean.


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Which direction is the univibe setting? Toggle facing the bottom of the pedal?

One other thing that's been in my head is the DRC rules for whomever you're sending this to for fabrication. Should be easily found with an internet search.

E.g. I searched for "eagle drc file jlcpcb" and got a 2-layer file that I've been using for a while now for things I send to JLC.

That'll help to make sure your files aren't kicked back because of incorrect spacing or borders—the ground plane and those two pads at the bottom look really close to the edge of the board boundaries, mainly.

Yeah luckily I found them a while back. I've made a few boards years ago, but basically forgot just about everything I learned then. Good call on adjusting the pads as well. Much appreciated.


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Thanks I'll adjust! Also I missed the source going to ground on q1 as well. Just noticed.


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Hey all, hoping someone could check my work real quick here and make sure it'll be ok before I send it off to fabrication. It's a benson pre-amp based on the pedal pcb schematic. I modified the parts connected to the potentiometer. He had a 2 meg dual gang pot in there bc apparently a 2meg log pot is hard for some to find. I made changes so it should keep the tone stack on that pot (bass control) and just use a 1M linear. Basically I halved the resistor values and doubled the cap values around the pot.

Tayda. But the docs for all 2n7000s are the same.


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I used the 2n7000s


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The second build is a Benson preamp clone from pedal pcb. Pretty straightforward no frills and really nice sounding!



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I've been playing around with UV prints and have been learning a bunch about that side of the hobby. Really enjoying it so far.


The most recent is from aion fix and with the help of a forum member here I got it up and running today. It's their megalith which is a box of rock and a distortron in a single box. Has switchable gain levels and a sub control (low frequency manipulation) and an internal order switch for boost before or after distortion. Pretty cool pedal.


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At Q1-Q4, signal goes into the gate, and should come out the drain amplified. If you have signal at the gate and not the drain, the FET is the location of the problem, if not the source of the problem.

Some things I would check: What parts am I using for Q1-Q4?  Are they known good FETs or could one or more be faulty?   Do the pinouts match the PCB (D-G-S)?

That was it. The docs were wrong about the way the transistors faced and it was printed incorrectly on the circuit board too. Put in sockets for all 4 after taking them out. Turned them around and everything worked. Thanks for the assist!


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Hi all working on the aion megalith. No sound coming out of either channel. And the signal seems to stop after the transistors on both sides.

I have audio probed the circuit and found that there is signal coming off the gate of both q1 and q4, but at the pots nothing.
The first odd thing I have noticed is that the gain pot will emit some sound on pin 3 if the pot is turned all the way down. No such luck on the drive level.
The second odd thing is that I don't hear any signal on r3 at all, but that goes to 9v (i'm not sure if no signal is ok there, but it gets to the transistor).

I've replace R3 just in case, and the same thing happens, no signal there.

Any ideas on what to check next? Attaching the schematic so you don't have to dig for it.