Search found 9 matches

by FrankLacy
Thu Aug 05, 2021 6:44 pm
Forum: Pro Audio Design
Topic: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator
Replies: 23
Views: 7317

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

Would you consider processing some song, recording the normal and quadrature mono sums, but then only publicly naming the files A and B (randomly selected) ?
by FrankLacy
Sat Jul 31, 2021 10:02 pm
Forum: Pro Audio Design
Topic: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator
Replies: 23
Views: 7317

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

Using single E96 resistors per stage, the differences would be:

stage 2: 220N 12K7
stage 5: 10N 14K0
stage 6: 10N 5K36
stage 7: 1N 19K1
by FrankLacy
Sat Jul 31, 2021 7:18 pm
Forum: Pro Audio Design
Topic: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator
Replies: 23
Views: 7317

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

I tried to match the Studer component values using the equations from Weaver. studer90m.JPG Six of the eight resistors came close, but two were off by more than 10% ? Calculated phase difference from the Studer schematic studer90a.JPG Calculated phase difference from the Weaver values studer90t.JPG
by FrankLacy
Wed Jul 21, 2021 2:43 pm
Forum: Pro Audio Design
Topic: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator
Replies: 23
Views: 7317

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

S. D. Bedrosian "Normalized Design of 90deg Phase-Difference Networks"
bedrosian.PDF
(643.75 KiB) Downloaded 81 times
by FrankLacy
Wed Jul 21, 2021 2:38 pm
Forum: Pro Audio Design
Topic: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator
Replies: 23
Views: 7317

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

Donald K. Weaver "Design of RC Wide-band 90 Degree Phase-Difference Network"
weaver_scan.PDF
(1018.53 KiB) Downloaded 81 times
by FrankLacy
Wed Jul 21, 2021 2:24 pm
Forum: Pro Audio Design
Topic: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator
Replies: 23
Views: 7317

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

R. B. Dome "Wideband Phase Shift Networks"
dome.PDF
(906 KiB) Downloaded 82 times
by FrankLacy
Wed Mar 24, 2021 6:55 pm
Forum: Document
Topic: Vintage Digital Clock Circuits
Replies: 26
Views: 60209

Re: Vintage Digital Clock Circuits

No, that was the end of clocks for me. I moved on to modular synths. Analog synths are much more forgiving - if you build something correctly, it makes some weird noise; if you make some mistakes, it makes some other weird noise. I think my next digital project was a cosmac elf.
by FrankLacy
Tue Mar 16, 2021 8:42 pm
Forum: Document
Topic: Vintage Digital Clock Circuits
Replies: 26
Views: 60209

Re: Vintage Digital Clock Circuits

I probably killed that poor IC in a dozen different ways.
by FrankLacy
Tue Mar 16, 2021 6:02 pm
Forum: Document
Topic: Vintage Digital Clock Circuits
Replies: 26
Views: 60209

Re: Vintage Digital Clock Circuits

Found this while cleaning. My first failed DIY project. I had no idea what I was doing.
ct7001.jpg