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by mediatechnology
Sun Jun 06, 2010 7:45 am
Forum: Pro Audio Design
Topic: Old: A Direct-Coupled Input-Capacitorless Active Mic Preamp
Replies: 212
Views: 409206

Re: A Direct-Coupled Input-Capacitorless Active Mic Preamp

Well, there may be a problem using those: http://documentation.renesas.com/eng/products/transistor/rej03g0635_2sa1084ds.pdf I was afraid of that when I noticed your link was to datasheet archive and the datasheet was 2001. So many parts are getting killed off. Maybe ON or Fairchild will pickup the 2...
by mediatechnology
Wed May 19, 2010 10:08 am
Forum: Pro Audio Design
Topic: Old: A Direct-Coupled Input-Capacitorless Active Mic Preamp
Replies: 212
Views: 409206

Re: A Direct-Coupled Input-Capacitorless Active Mic Preamp

Customers would probably be more turned off by the switch noise, than any subtle sonic benefit they might receive. Customers are funny that way. The best sounding audio path will be dismissed if it suffers switch clicks and pops and turn on/off transients, as evidenced by all the cap coupled gain p...
by mediatechnology
Tue May 18, 2010 12:14 pm
Forum: Pro Audio Design
Topic: Old: A Direct-Coupled Input-Capacitorless Active Mic Preamp
Replies: 212
Views: 409206

Re: A Direct-Coupled Input-Capacitorless Active Mic Preamp

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...
by mediatechnology
Tue May 04, 2010 1:11 pm
Forum: Pro Audio Design
Topic: Differential Input Questions
Replies: 10
Views: 19218

Re: Differential Input Questions

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?
by mediatechnology
Tue May 04, 2010 11:54 am
Forum: Pro Audio Design
Topic: Differential Input Questions
Replies: 10
Views: 19218

Re: Differential Input Questions

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 ...
by mediatechnology
Tue May 04, 2010 7:07 am
Forum: Document
Topic: Walt Jung Op Amp Applications Handbook
Replies: 0
Views: 12711

Walt Jung Op Amp Applications Handbook

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
by mediatechnology
Tue May 04, 2010 7:02 am
Forum: Pro Audio Design
Topic: Differential Input Questions
Replies: 10
Views: 19218

Re: Differential Input Questions

Image
Line_Receiver_Var_Gain_Jung_Op_Amp_Apps_6-26.jpg
by mediatechnology
Sun Apr 18, 2010 3:56 pm
Forum: Document
Topic: MicMix Master Room Studio B Schematics
Replies: 0
Views: 8527

MicMix Master Room Studio B Schematics

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...
by mediatechnology
Sun Apr 18, 2010 3:41 pm
Forum: Document
Topic: MicMix Master Room Studio C Manual and Schematic
Replies: 0
Views: 6749

MicMix Master Room Studio C Manual and Schematic

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)