I built this pedal about 9 years ago using the attached files. It turned out very good. It still works today,

Mike

I vote for Sprint. I am using version 6.0 and it is very easy to use. The price was reasonable too.

I also use DIYLC for schematics.

Thank you for the PDF. I will be trying to build a Univibe based on the Layout I have and the Transfer you posted.

Does anyone have a good link for the Univibe Replica PCB Transfer files? The wayback machine has several component layout files, but the link to the transfer PCB image is broken. I found the link to the PCB transfer is broken everywhere I have looked on the internet. Can anyone help? I would like to...

Thanks for the reply. In one position, the output will be the full preamp signal, intended to be sent to a power amp. The other position will be attenuated for use as an effects pedal or amp emulation pedal. I would need to switch to the appropriate mode BEFORE using it. If I am going to use it as a...

What is your opinion. Can anyone think of a better way?

I am building a stomp box that can be used as a preamp or as a pedal. This will be based on the preamp of a hot-rodded Marshall.

The output of a 4-stage tube preamp is too hot for the input of am amp, so I wanted to install a switch that will attenuate the output for use as a pedal.

This is what I was talking about. Would the zeners on the input provide protection for the op amp? If so, what values would you recommend?

I was using my Danelectro Honey Tone amp with an audio signal probe I built to troubleshoot audio circuits. It worked great until I used it to probe a tube preamp circuit. Now there is no output. I think I blew the op amp (TL072) because the signal is too high in a tube preamp. I will replace the op...

Referring to the schematic posted last year, does anyone know the purpose of the MOSFET in the power section of the schematic? I have never seen that before.

Mike

Thanks for the detailed response. I have been wondering about this for a while.

I was wondering why Friedman and others have Vbias going through an op amp? Is there an advantage to this like less noise or is this just something you do with unused op amps?

I bought the OC-44 Germanium Transistor from SmallBear. The price is $8.95, which is expensive, but it biased perfectly and has relatively low noise. I bought one off of eBay that was unusable.

I agree with everything peterc said. Also, the forum members and the admins are very respectful and don't make newbies feel like they are stupid.

Mike

I have heard it mentioned in this forum that you can build the Tight Metal and Tight Rock from the same layout, but with different component values. Does anyone have the component values of the tight rock (or a schematic with values)?

Mike

DarkRain,

What kind of inductor do you use in your SMPS? I am using a toroid inductor rated at 3 amps, but it takes a lot of space. I like how compact your power supply is.

Thank you for sharing your GTFO information. It has really been educational.

Mike

I have a Fender Roc Pro 700 and it has the same problem. After looking at the schematic, I noticed that volume and gain pots are linear instead of Log. I think this was a design flaw. If the volume pot was changed to a log taper pot, it would prevent this sudden jump in volume. I haven't done that, ...