Pro Audio Design Forum

Thank you Rob for the kind words and history. You may have inspired me to dust off that protoboard and for that matter my entire workbench. I haven't done much in there other than change batteries since November. As I mentioned to Ilya earlier up in the thread I would change the servo to the one her...

https://www.ka-electronics.com/Images/p ... ook_V4.pdf (25 MB)

I used cross-coupled diff amps in figure 10 of DN-140 because they were symetrical:

http://www.thatcorp.com/datashts/dn140.pdf#page=14

Why inverting buffers?

The one thing I do like about the circuit in figure 6-26 is the ease of gain adjustment via R5. Adding passive LPF to both input resistors, protects the opamps from slew limiting, and reduces the HF CM energy making rejection easier. I agree, but what topology network would you use? A cap to ground ...

I highly recommend this. It's only about $38 in paperback.

Op Amp Applications Handbook (Analog Devices Series) http://www.amazon.com/gp/product/075067 ... ss_product

Wayne

Line_Receiver_Var_Gain_Jung_Op_Amp_Apps_6-26.jpg

I also found the studio B schematic. For those of you that might be troubleshooting a Studio B reverb and need the component values I'd look at the Studio C parts list. I believe they were almost identical. https://www.ka-electronics.com/images/jpg/MicMix_Master_Room_Studio_B_Schematic_Small.JPG Mic...

I also have a copy of the MixMix Master Room Studio C Series reverb manual and schematics.

https://www.ka-electronics.com/images/p ... Manual.pdf (8.1 MB)

I've been asked to provide the MicMix Master Room XL-305 reverb manual. I finally found a preliminary copy: https://www.ka-electronics.com/images/pdf/MicMix_Master_Room_XL-305_Manual.pdf (6.2 MB) In going through some scrap paper at my Mom's house I found hand-written ad copy. Apparently I must have...

Since I am arguing that a lower output termination is generally harmless and could even deliver lower input noise... That's one of the things I strived for in the DN-140 pads: To keep the impedance seen by the preamp low when the pad was engaged. With an open-circuit input and high gain (the showro...