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Hi all,
I'm building a preamp pedal based on sunn O))) beta bass.
My idea is to use different input voltage (9 or 18v), so I'm planning to use this schematic as "power section":


I tested the circuit without any chip, and with 18v input the DMM shows 17,8 volts.
Am I doing something wrong?

some years ago I started to build a mic preamp with phantom power supply.
I bought a 2x15v transformer as main power and for the phantom a... 2x12v transformer.
What strange drugs did I take to get this idea? How can I get 48v from 2x12v transformer?

I bought also every component to build this project and there is no charge pump or something similar.
Only a 48v zener diode.

This sunday I was bored so I made a fuzz.
I was curious about the GI Fuzz, so I made the pyledriver, but changing the name. I think that mine fits better 

The build itself is simple, few components, pc mount pots, the graphic is minimal.
I don't like the 125b because it's too thick, so I reduced the thickness by cutting away 8mm from the bottom, so I don't have to lift my foot very much 
The sound is very... as you want, there are many controls, many sounds. It is still a fuzz, but very versatile.

Hi all,
I have a Mackie 402-VLZ3 since about 10 years.
It's a nice toy, I use it with computer out, in, instruments and other stuff that make noise.
Mic channels also have the instrument switch, a buffer that allow me to play with my passive bass directly into the mixer.
The switch stopped to work, when I activate it no sound come out.

the buffers are the 2 opamps of a TL072.
this is the schematic (I attached the complete pdf file):

I measured the voltages:
1. -15.04
2. -15.04
3. -1.87
4. -16.30
5. -1.87
6. -14.96
7. -14.96
8. 16.05

I also tried to probe the output of the opamps and are both mute.
Maybe the tl02 died?

Thanks a lot.

PS. I don't know if this is the correct section, but this is not DIY, so...
PPS. Sorry for bad english. Any errors are google translate's fault 

Hi,
I just made a uber tuber.
The tube is a 6021 from smallbear. Every value as from the BOM, but C4 is 10n on socket.
I set the trimmers to have about 11,5V on each plate (drive knob at 0%).
The sound is very dark, SAT and CUT doesn't do anything.
I probed it. On pin 1 of CUT knob (all the way up) the sound is brighter.
I don't have tool to measure except my multimeter and my ears.
What can I do?
Here two photos of my building:



Thanks!

Hi all,
I'm Ennio from Italy. I play the bass (the instrument, not the fish) and I like sports (swim, MTB, archery).
I registered in 2012, but I realized only today that this section exists! 
I started making pedals in 2010, and then I started studying the basics of electronic.
Today I'm still studying same things   

I'm not good in presentation, so I let my buildings speak for me.
My last is a Celeste Chorus
I would have liked to have a fender paisley, but I'll settle for the pedal...

This is my youtube channel.

PS.My english teacher was more interested in food than in teaching, so... forgive my bad english.