DIY Guitar Pedal

MichaelM · Posted: Fri Sep 18, 2009 12:56 am Post subject: DIY Guitar Pedal

So I'm probably going to make this:

http://www.barberelectronics.com/Barber_Electronics_DIY.html

If for nothing else than to get some more electronics practice in. A few months ago we did an electronics prototyping course and made some little MSP430 based boards. I haven't done anything since, so this is an easy way to get back into it.

I've used Eagle PCB to recreate the schematic, so that I can do a PCB board layout for it. The Barber page says they don't want people reproducing the schematic elsewhere, which is fair enough. So, I'll just post a picture of the board layout when its done.

MichaelM · Posted: Fri Sep 18, 2009 8:18 am Post subject:

Well, have the board layout done. Might have to tweak it a bit after I've ordered the parts, I wasn't sure what packages to pick with some things.

Here it is:

rudibass2 · Posted: Fri Sep 18, 2009 11:49 am Post subject:

What grade of components are you using ? It's been a while since I've built any circuits but I remember the huge difference in price of say
gold band resistors vs. silver .
That's a quality rating of the % of +/ - the stated value for you other 100 members who might not understand electronics !!!!!

I would guess a descent instrument pedal would need to be at least in the +/- 10 % range , yes ??
_________________
Mike

" Have Sticks , will Travel "

" Keep on rockin' in the free world !"

Neil Young

MichaelM · Posted: Sun Sep 20, 2009 12:07 am Post subject:

I haven't bought any of the parts yet, so I'll see what I can get from Jaycar.

Was probably going to go with 1% metal film resistors. As for capacitors, I'm not really sure. Really that is all there is to this apart from the op-amp chip in the middle.

From reading around though there seems to be a big discussion on what makes a good op-amp for audio applications. The chip on the board layout is an LM324 quad op-amp package. According to a guy at uni (an electronic engineer) that op-amp is very common. We'll see.

MichaelM · Posted: Mon Sep 21, 2009 2:42 pm Post subject:

OK. After some advice from a dude over on recordingproject, I replaced the 14 pin IC with an 8 pin socket so that I can change out the opamp with different ones if I feel the need. I also added the option of an LED power indicator.