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.
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