Yeah so like the title says, I built a 78 opamp Big Muff using the tagboard layout, the uA741/4558 and tone bypass switch. It's pretty loud, but not _really_ loud.. is the 741 stage controlling the overall max signal being sent to the tone stack and then volume? What options are there for boosting output? I attached the schematic that the layout is based off, and all the notes about dotted line recommendations are taken into account.
(https://s9.postimg.org/8ak8d4grf/7fd0c4491aa83b8fe0acd5299604148f.png) (https://postimg.org/image/8ak8d4grf/)
So yeah just looking to boost output volume without stacking a boost or something. Any ideas? :icon_mrgreen:
I had the same issue with the one I built. It's not a loud circuit.
You could start by getting rid of R16, it's chopping of a smidge of volume and is superfluous anyway.
I think I got my volume a little more reasonable with a 500K volume pot.
A 500K volume pot will let some more low end through though too, so you may or may not like the tonal change.
Otherwise, you could try bumping R13 up, but I don't think it would make all that much of a difference since that stage is pretty maxed out. If you did bump it up, you might have to reduce C9 to get the same low pass characteristic.
Mine is a Frankensteined version of this, but I believe I did give in and just tacked a fet booster onto the end.
Cool man thanks for sharing. Yeah it's fantastic tone-wise, I'm super pleased but it barely pushes my amp. I will fool around with these ideas. Thanks again :)
I think I may just bypass the volume pot and run it straight into a Majikbox venom boost. Then it'll have serious amp crushing power. And jettison the superfluous 100k to ground there as mentioned above.
in the "tone bypass" position, R18 and R19 form a volume control, set half-way. probably to match the level from the tone stack, but if you want volume over toans, reduce R18 or increase R19
Ok that's good information. I would like the bypass to be a bit louder. I'll mess that with :) thanks much sir!!
So I whipped up a venom boost, and ran it in series after the volume pot, but instead of having the volume pot on the venom I put 2 resistors on a toggle, so you have loud and then throw the toggle and Loud AF. Pretty happy with how it sounds. Thanks for the help guys :icon_mrgreen: