Search found 519 matches

by emrr
Mon Sep 16, 2019 10:59 am
Forum: The Peabody Lounge
Topic: Miking the Royal Albert hall
Replies: 5
Views: 58

Re: Miking the Royal Albert hall

Great article. I noticed that the radio and TV trucks also use different mic arrays. Radio provides a true 4.0 surround mix + stereo fold down and TV provides 5.1 + stereo fold down. Managing all of those sources, feeds, hitting cues and monitoring comms from the crew would seem like a lot of work ...
by emrr
Tue Sep 03, 2019 8:26 am
Forum: Pro Audio Design
Topic: Dielectric Absorption
Replies: 60
Views: 26565

Re: Dielectric Absorption

Slightly off topic, but I'm reminded of the unpleasant discovery of leakage in old can electrolytic caps, when the bright idea is had to tag in new ones to the existing positive terminals and disconnect the can negative leads, thereby saving major mechanical rearrangements. One immediately decides t...
by emrr
Wed Jul 24, 2019 8:22 pm
Forum: Pro Audio Design
Topic: ~QUESTIONS ABOUT "LOCAL"-NEGATIVE-FEEDBACK OUTPUT SECTIONS THAT ARE BASED ON A TERTIARY-WINDING OUTPUT TRANSFORMER~
Replies: 8
Views: 602

Re: ~QUESTIONS ABOUT "LOCAL"-NEGATIVE-FEEDBACK OUTPUT SECTIONS THAT ARE BASED ON A TERTIARY-WINDING OUTPUT TRANSFORMER~

offhand:

Altec 428B
Collins 356A
Langevin AM-5116-B
RCA BA-21A
Several of the original UA preamps, I think also one or more of their SS types. LA-3A?
There are several Lundahl designed for SS with tertiary feedback I think.
There are others.
by emrr
Sat Jul 06, 2019 10:02 am
Forum: Pro Audio Design
Topic: Transistor Vbe Matching Using A Commutating Chopper-Based Circuit
Replies: 2
Views: 686

Re: Transistor Vbe Matching Using A Commutating Chopper-Based Circuit

Nice. I could have used that back when I was rebuilding a lot of Altec 9470A/9475A push-pull preamps. Those just don't work at all if vbe is out of scale or mismatched.
by emrr
Wed Jul 03, 2019 10:52 am
Forum: The Peabody Lounge
Topic: Something to ponder about IoT
Replies: 41
Views: 4214

Re: Something to ponder about IoT

Im beginning to explore replacing a security system, and starting to think about a cell based connection that I receive a feed from rather than a hardwired connection with 3rd party monitoring. I did find another 4 pack of 60W bulbs I'd misplaced, which were for a lamp under a water line that might ...
by emrr
Wed Jun 12, 2019 11:58 am
Forum: Pro Audio Design
Topic: A Discussion About True Power Summing for Stereo Compressors
Replies: 65
Views: 77153

Re: A Discussion About True Power Summing for Stereo Compressors

Thanks, will report back once tested.
by emrr
Wed Jun 12, 2019 11:39 am
Forum: Pro Audio Design
Topic: A Discussion About True Power Summing for Stereo Compressors
Replies: 65
Views: 77153

Re: A Discussion About True Power Summing for Stereo Compressors

Dual single shaft pot I assume, has to be.
by emrr
Wed Jun 12, 2019 10:46 am
Forum: Pro Audio Design
Topic: A Discussion About True Power Summing for Stereo Compressors
Replies: 65
Views: 77153

Re: A Discussion About True Power Summing for Stereo Compressors

The only comp I can think of offhand with a weighting control is the Manley/Langevin ELOP.
by emrr
Wed Jun 12, 2019 10:06 am
Forum: Pro Audio Design
Topic: A Discussion About True Power Summing for Stereo Compressors
Replies: 65
Views: 77153

Re: A Discussion About True Power Summing for Stereo Compressors

This thought directly modifies the existing DIY product that started this forum, which had a single side chain with one set of controls, RMS detector pin 5 joined and VCA pin 15 joined.
by emrr
Wed Jun 12, 2019 9:32 am
Forum: Pro Audio Design
Topic: A Discussion About True Power Summing for Stereo Compressors
Replies: 65
Views: 77153

Re: A Discussion About True Power Summing for Stereo Compressors

Yeah Wayne, you got it. Ends up in mono in a mix. Both sources need compression that track each other to avoid changes in sonic texture, yet bleed in the mic is always a problem. Letting the DI be all of the side chain source is the easiest path, but some weighting control might really be the most i...