Here's a collection of vero (stripboard) and tagboard guitar and bass effect layouts that we have put together covering many classic and popular effects in growing numbers. Many of these have been posted on freestompboxes.org, so check that site out for great discussions on building your own effect pedals. Enjoy the builds and please also visit us on Facebook and Twitter
Finished this one and it's super finicky about which op amps you use. 4558s gave me loud oscillation with gain knob increases. My best result was two 4580s which took care of the oscillation although it's not quite right. There's too much compression with gain maxed. If I let a note sustain, the output actually gets louder when it should be fading out. Also with gain turned down, the tone is quite anemic and almost like a cocked wah. I double checked for correct values/placement and solder bridges and my build seems good. I'll experiment with more op amp swaps tomorrow
Seems like the two schematics have tone pot connections in a contradiction with each other. I'll swap 1&3 around, which seems to be correct.. Tone 3 should be going to 100n/100K.
I'll double check the layout too, later today. However, the oscillation is often cured by placing a high gain circuit like this in an enclosure, which acts like a faraday cage. So i'm not certain if the opamp type matters much. +m
I reversed the tone wire labels. And checked the layout against Manfred's fixed schematic. Only "issue" or mistake i found was the vref filter cap value, whis is 47µ instead of 100µ. Changed that too.
On FSB thread there is some discussion about the resistor at input stage opamp. 68K there could be to ground instead of vref. But i don't think changing that would cause these symptoms.
Layout completed. All pots work as described. No squealing or oscillating. Tried with TL072 and 4558 opamps. No difference to report. I will test some 2N5089s for hFE and just try a high one and a low one to see if anything changes but not expecting anything major.
I'm going to feed power via a halfwave rectifier and some caps to ground to try and clean it up a bit. High gain and bright at the end of that tone control.
Just finished this vero. A few people seemed to have built it. Did this ever miss getting the verified stamp? I'm getting no output or even hum. I'll go over it again with the magnifying lamp and see if I've goofed it somewhere. Currently has TL072s rather than 4558s as a fault finding option.
Finished this one and it's super finicky about which op amps you use. 4558s gave me loud oscillation with gain knob increases. My best result was two 4580s which took care of the oscillation although it's not quite right. There's too much compression with gain maxed. If I let a note sustain, the output actually gets louder when it should be fading out. Also with gain turned down, the tone is quite anemic and almost like a cocked wah. I double checked for correct values/placement and solder bridges and my build seems good. I'll experiment with more op amp swaps tomorrow
ReplyDeleteAlso, the tone knob is backwards than regular. I haven't seen demos of this pedal so not sure if that's on purpose
ReplyDeleteSeems like the two schematics have tone pot connections in a contradiction with each other. I'll swap 1&3 around, which seems to be correct.. Tone 3 should be going to 100n/100K.
DeleteI'll double check the layout too, later today. However, the oscillation is often cured by placing a high gain circuit like this in an enclosure, which acts like a faraday cage. So i'm not certain if the opamp type matters much.
+m
I reversed the tone wire labels. And checked the layout against Manfred's fixed schematic. Only "issue" or mistake i found was the vref filter cap value, whis is 47µ instead of 100µ. Changed that too.
DeleteOn FSB thread there is some discussion about the resistor at input stage opamp. 68K there could be to ground instead of vref. But i don't think changing that would cause these symptoms.
This should be noisy, though...
+m
My first unverified build.
DeleteLayout completed. All pots work as described. No squealing or oscillating. Tried with TL072 and 4558 opamps. No difference to report.
I will test some 2N5089s for hFE and just try a high one and a low one to see if anything changes but not expecting anything major.
I'm going to feed power via a halfwave rectifier and some caps to ground to try and clean it up a bit. High gain and bright at the end of that tone control.
Just finished this vero. A few people seemed to have built it. Did this ever miss getting the verified stamp? I'm getting no output or even hum. I'll go over it again with the magnifying lamp and see if I've goofed it somewhere. Currently has TL072s rather than 4558s as a fault finding option.
ReplyDelete