Search found 4 matches

by optodyne
Mon Dec 07, 2020 12:43 am
Forum: Pro Audio Design
Topic: variable gain amplifier using analog optoisolators
Replies: 6
Views: 18591

Re: variable gain amplifier using analog optoisolators

The Tesla "Vactrols" are very interesting. I hope they come out with a VTL 5C3 replacement. I would keep going with your project though I'm not sure you'll find an CdS-based photocell to be fast enough for peak limiting. You might want to consider a hybrid approach using both an Opto and a FET. The...
by optodyne
Thu Nov 26, 2020 4:51 pm
Forum: Pro Audio Design
Topic: variable gain amplifier using analog optoisolators
Replies: 6
Views: 18591

Re: variable gain amplifier using analog optoisolators

some progress: as already mentioned, I need both fast and slow response, so I decided to split the control voltage and feed those into different RCs which are then buffered and finally summed at the LED driver. Atm there are nine timeconstants and a DC bias which makes sure the LEDs are always on. T...
by optodyne
Wed Nov 25, 2020 9:06 pm
Forum: Pro Audio Design
Topic: variable gain amplifier using analog optoisolators
Replies: 6
Views: 18591

Re: variable gain amplifier using analog optoisolators

mediatechnology wrote:
Wed Nov 25, 2020 8:19 am
I purchased the fastest optos available, the Tesla 3WK160
Hi, thanks for your post.
Do you have a data sheet link for the opto?
http://www.tesla-blatna.cz/en/products- ... rezistorem
by optodyne
Mon Nov 23, 2020 12:30 pm
Forum: Pro Audio Design
Topic: variable gain amplifier using analog optoisolators
Replies: 6
Views: 18591

variable gain amplifier using analog optoisolators

I´m Horst from Bavaria, been lurking for some time. My current project is an optical dynamics processor to manage my audio, the main goal is to prevent the level going higher than 0 dBu. I purchased the fastest optos available, the Tesla 3WK160 which has an almost zero attack and release. By biasing...