Thanks you for the tip, but this only reduce a little gain.
I want the boost pot to act as volume pot. or something like that, because when i hit the pedal it becomes to loud.
i already put a 100k out to act as a volume but its not the same, and i want to keep the 100R impedance at the end.
When you build the properly it works.....faithful repro of original Coron 15 which I am lucky enough to own. Nice project, not too complex. I used OA90 diodes, but LEDs or other diodes should work. Also, just use the closest possible values, if you can't get the actual exact ones !
Good luck, it took me a few attempts to get it going, the eyes are not what they used to be.
Built it today and it works just fine....I will AB it with a Coron 15 I have sat around, although it looks authentic enough in terms of values of components etc...can't see why it would sound any worse at all. Niceley laid out and very compact. If you are from UK just use the nearest value components. I had to opt for OA90 germanium diodes (this is all Maplin had at the time). Although LEDS / other diodes should work fine as well.
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.
Hi,
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.
Thanks
Cyril.
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?
Thanks you for the tip, but this only reduce a little gain.
I want the boost pot to act as volume pot. or something like that, because when i hit the pedal it becomes to loud.
i already put a 100k out to act as a volume but its not the same, and i want to keep the 100R impedance at the end.
Thank you for verifying it!
I really should spend more time on DIYL ... :(
Replace R1 with 6K8
When you build the properly it works.....faithful repro of original Coron 15 which I am lucky enough to own. Nice project, not too complex. I used OA90 diodes, but LEDs or other diodes should work. Also, just use the closest possible values, if you can't get the actual exact ones !
Good luck, it took me a few attempts to get it going, the eyes are not what they used to be.
Circuit verified....no excuses!
Built it today and it works just fine....I will AB it with a Coron 15 I have sat around, although it looks authentic enough in terms of values of components etc...can't see why it would sound any worse at all. Niceley laid out and very compact. If you are from UK just use the nearest value components. I had to opt for OA90 germanium diodes (this is all Maplin had at the time). Although LEDS / other diodes should work fine as well.
Nice one Harold!!
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.
[IMG]http://i242.photobucket.com/albums/ff176/pm7300/02-1.jpg[/IMG]
Thanks man!
Sorry, I can't troubleshoot it here without exrta information like pictures and such ...
Please use the contact form to get personal help, or post a topic on http://www.diystompboxes.com/smfforum/ or http://www.freestompboxes.org/ for more help...
Sorry, I can't troubleshoot it here without exrta information like pictures and such ...
Please use the contact form to get personal help, or post a topic on http://www.diystompboxes.com/smfforum/ or http://www.freestompboxes.org/ for more help...
Sorry, I can't troubleshoot it here without exrta information like pictures and such ...
Please use the contact form to get personal help, or post a topic on http://www.diystompboxes.com/smfforum/ or http://www.freestompboxes.org/ for more help...
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
thanks
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!
Hi,
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.
Thanks
Cyril.
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
Try to place the in- and outpus as far from each other as possible. And also ground the effect input whan in bypass: http://diy-layout.com/node/56
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.