I have since rebuilt this and it works just fine.
I will rebuild and confirm whether it works.
Profuse apologies to Harold
Okay I traced the circuit and feasibly this looks good. But here's the problem, the 741 chip is not mounted directly onto the pcb copper side, it is physically mounted, as should all of the components be, from the non copper strip board side and soldered onto the copper side where the legs poke through. The 741 chip correctly has the number 1 pin marked with a black circle for orientation purposes, however, this changes when the chip is mounted from the rear ie non copper side, and the legs soldered onto the copper side. whilst orientation is not a problem for all of the 2 legged components, it is for multi egged components. Nicely laid out, just does not work! I am an electronics engineer with 27 years experience, I was building this with my son, when we noticed the problem. I will try and troubleshoot this, one obvious solution perhaps is to reverse the legs on the chip so it is effectively turned upside down.
Hi. I've just finished two of these pedals, the one for me and the other for a friend of mine. Your project works and the pedal sounds VERY nice! Thank you so much for sharing. BTW: I used two pairs 1N914 diodes. This is a Tube Screamer with the attributes.
It's not really a big difference but it should be noticeable, especially on higher boost settings (my experience)
No problem, it will only alter the feel of the boost knob, not the function.
Hi, how can i reduce the volume boost to 0db
Hi there, I'm finding it difficult to get a 10k reverse log pot. Can it be a linear pot?
Ok. You should build one for me :)
I tested this circuit. Works great! Thanks!
The bass boost doesn't work for me.
I changed the caps C2, C3, changed the switch, changed Q1, it seems that nothing happens when I switch.
It's ok with the other switch on the 15K resistor.
Help me, please because it works perfect instead of that.
Alright, nice to hear.
I can get the my amp signal through, but nothing else works.
Ok thanks for that - I have placed the input and output wires as far away as possible, replaced all with shielded cable, and rewired the footswitch as per your example. Still the squeel. Could it possibly be a problem on the board that I am not noticing?
I am just stumped for what is wrong
Thanks so much
Working perfectly! Built it twice myself and know a few folks who did too.
Pin 4 = +12v DC and pin 5 = GND, as depicted in the layout ;)
The center isn't used.
It will also work with 1N400x diodes, but you'll end up with less Volts with those...
Thakns for this layout
My build works fine except there is this ear piercing high pitched squeel whether the effect is bypassed or on.
Tried to replace all wires with shield cable and use the inner part of the cable but still the squeel continues. Any ideas would be so appreciated
Not working. This is fake.
What is to be done with those?
What diode configuration did you use?