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Topics - zyggurat

#1
Preamps and Effects / Help with making of a preamp
February 26, 2007, 04:35:23 PM
Hello. I ´m going to make my own preamp that ´ll use TONEMENDER (tone control) http://www.runoffgroove.com/tonemender.png and FX loop called "splitter blend" http://www.runoffgroove.com/splitter-blend2.png from runoffgroove.com.
The preamp will look like this:

Input  -> Tonemender -> FX loop -> Output (to poweramp)

1.In schematic of tonemender, why is the first opamp wired as a voltage follower? Isn´t  there any gain needed for input of my preamp? Can (should) I wire this as a normally non-inverting opamp to get bit of gain?

2.The "splitter-blend" is dual fx loop , but I´m going to use only the RED part of that loop, so I´ll get single loop. Is that right? Will it work?
Another question about this fx loop is same as about the tonemender, in this RED part of fx loop there are two opamps, both wired as voltage followers.

3.If I rewire this two circuits to feed they from dual power supply, can I feed poweramp from the single PS? If yes, how should I connect their grounds together? 0V (gnd) of dual PS with - (0V) of single PS ?

4.I ´ve read somewhere of adding a cap to paralel with volume pot, to avoid highs or bass loss at low volumes, is one cap enough for that ? How can I calculate it´s value?

Thanks for all replies. ;)