Search found 5471 matches
- Thu Mar 31, 2011 1:21 pm
- Forum: Pro Audio Design
- Topic: SMT passives for audio
- Replies: 34
- Views: 65239
Re: SMT passives for audio
I think I want to make a capacitor null tester. As JR and I have both discussed elsewhere, the terminal voltage developed across a coupling capacitor is usually very small until low frequency cut off is reached. At low frequencies, the reactance begins to become significant relative to the load resi...
- Thu Mar 31, 2011 7:55 am
- Forum: Pro Audio Design
- Topic: 4301...two scenario's
- Replies: 2
- Views: 9187
Re: 4301...two scenario's
Roland - For set and forget you might just want to use the auto non-linear capacitor if you want an RMS compressor. To emulate an SSL feedback peak limiter you could use a pair of untrimmed 2181C or 2180C VCAs for the sidechain along with the 4301s for the main path. Wayne
- Wed Mar 30, 2011 10:40 am
- Forum: Document
- Topic: Signetics NE570 NE571/572 Compander Product Guide
- Replies: 3
- Views: 10061
Signetics NE570 NE571/572 Compander Product Guide
I finally got around to scanning some of the material JR sent me.
This is the 1981 Signetics Compander Product Guide with applications.
https://www.ka-electronics.com/Images/p ... _Guide.pdf
Thanks, John.
This is the 1981 Signetics Compander Product Guide with applications.
https://www.ka-electronics.com/Images/p ... _Guide.pdf
Thanks, John.
- Sun Mar 27, 2011 11:28 am
- Forum: Pro Audio Design
- Topic: SMT passives for audio
- Replies: 34
- Views: 65239
Re: SMT passives for audio
1/(2 x pi x R x C) What JR said. Javascript calculator: http://www.muzique.com/schem/filter.htm With that dramatic of an audible difference I would be tempted to do some null tests between cap A and cap B to better quantify and qualify the actual differences. That's how I would go about looking for...
- Thu Mar 17, 2011 2:47 pm
- Forum: Pro Audio Design
- Topic: A Modern Loftech TS-1 Audio Test Set
- Replies: 66
- Views: 205420
A Modern Loftech TS-1 Audio Test Set
This thread is a copy of the Loftech TS-1 Schematic document thread. JR is in the process of considering a modern replacement for the ubiquitous Loftec TS-1 using modern DSP-based electronics. I could do that entire puppy today, even better using only a few digital chips... (somebody stop me...) :l...
- Thu Mar 17, 2011 2:47 pm
- Forum: Test, Measurement and Repair
- Topic: Loftech TS-1 Schematics
- Replies: 36
- Views: 90486
Loftech TS-1 Schematics
Loftech TS-1 Test Set Schematic https://www.ka-electronics.com/images/jpg/Loftec_TS1.jpg Loftech TS-1 Schematic Loftech TS-1 Schematic Large Format jpg : https://www.ka-electronics.com/images/jpg/Loftec_TS1_Large.jpg (2MB) Loftech TS-1 Schematic pdf : https://www.ka-electronics.com/images/pdf/Lofte...
- Sun Mar 13, 2011 7:46 pm
- Forum: Pro Audio Design
- Topic: SMT passives for audio
- Replies: 34
- Views: 65239
Re: SMT passives for audio
It seemed as a generalization, physically larger resistors performed better and, as previously mentioned, the Susumu and RCD resistors performed best. Glad I saved that e-mail. Bigger is better seemed to be particularly true with the Panasonics he tested. As I previously mentioned there are some sp...
- Sun Mar 13, 2011 11:55 am
- Forum: Pro Audio Design
- Topic: SMT passives for audio
- Replies: 34
- Views: 65239
Re: SMT passives for audio
Dave Hill of Crane Song was very kind to permit me to reproduce his SMT resistor findings. Thanks, Dave!
http://www.waynekirkwood.com/Images/pdf ... nesong.pdf
At the end of the document is an update he posted this year.
http://www.waynekirkwood.com/Images/pdf ... nesong.pdf
At the end of the document is an update he posted this year.
- Fri Mar 11, 2011 1:14 pm
- Forum: Pro Audio Design
- Topic: SMT passives for audio
- Replies: 34
- Views: 65239
Re: SMT passives for audio
Yep, in that Panasonic line the 0805 vs the 1210 had an order of magnitude greater THD. So in that one particular case bigger was better. Susumu/Digi-Key have this tiny little figure that may show why the Susumu is better. It was once mentioned to me that they may have some magic in their annealing ...
- Fri Mar 11, 2011 10:10 am
- Forum: Pro Audio Design
- Topic: SMT passives for audio
- Replies: 34
- Views: 65239
Re: SMT passives for audio
The Susumu RR series seem to be readily available but the "audio" version RRS is pretty much unobtainium. That was my experience too. I'll see if I can find Dave's original research on the resistors "not as good" and then ask for his permission to use the data. EDIT: I found the...