Hi, Right the LM13700 is a better OTA than CA3080, but yes there will be noise and MXR combatted that via a pre emphasis at the input and deemphasis at output, but curves do not align and there is then a loss of treble yet wideband noise.Also maximum input before distortion is something like 20mV's...

The corrected schematic is here.
-Cheers-

It is almost identical to Dynacom. Well this is the schematic Behringer_DC9.pdf Looking at the ic there is some room for upgrades. There are nice FET buffers available. The differential inputs of the opamp could be DC clamped which should reduce the noise a lot. It is going to be a nice weekend proj...

Behringer DC9

PCB photos
Top Layer Bottom Layer Circuitry close up It is using surface mount BC846 transistors, CoolAudio V13700 absolutelly identical to LM13700.

I will post the schematic tomorow.

When you guys are designing and building effects what do you prefer SM or trough hole components and why? What kind of advantages or disadvantages do you see in each one of them. For the last 8 years every design that I did (nature of my job :D ) I used Sm resistors, caps, ic's and inductors. Just i...