Search found 5447 matches
- Mon Oct 11, 2010 1:39 pm
- Forum: Pro Audio Design
- Topic: console grounding
- Replies: 12
- Views: 20461
Re: console grounding
I think you may want to tie everything to ground. Now that this thing has become an SE version (with both halves of the 1570 doing both L&R) there's no virtual ground summing node for the - leg. That just occured to me. With CM rejection only being realized in the 1240, the source impedance feed...
- Mon Oct 11, 2010 12:20 pm
- Forum: Pro Audio Design
- Topic: console grounding
- Replies: 12
- Views: 20461
Re: console grounding
Yes a direct path to ground. The VCA should go directly to ground and most other nodes as well. I'd use that extra pin and tie a resistor from it to ground. That build-out resistor would feed the - leg of the bus. Have you also looked at connecting pins 3 of the 1240s (U3 and U6 after the 1570) to t...
- Mon Oct 11, 2010 11:57 am
- Forum: Pro Audio Design
- Topic: console grounding
- Replies: 12
- Views: 20461
Re: console grounding
I don't think you want R18 where you have it. I think that node needs to be ground (R18=0R). You may need another pin on the connector. I really need to look at the dwg on a printed copy. EDIT - What I meant by "quasi-balanced" is that only the + leg was driven. They couldn't field modify ...
- Mon Oct 11, 2010 11:48 am
- Forum: Pro Audio Design
- Topic: console grounding
- Replies: 12
- Views: 20461
Re: console grounding
FYI drawings don't auto scale here. I can't remember if it's broken or a board mod is required. I try to limit mine to 700 pix or so. I'll save your drawing off-line so I can look at it.
- Mon Oct 04, 2010 9:44 am
- Forum: Document
- Topic: dBx 3BX Three Band Dynamic Range Expander
- Replies: 8
- Views: 18809
Re: dBx 3BX Three Band Dynamic Range Expander
There is a second page I need to post with PSU and metering I had forgotten about.
It was early 1970's era.
It was early 1970's era.
- Sun Oct 03, 2010 10:28 am
- Forum: Document
- Topic: Electronic Design IFD: JFET Curve Tracer
- Replies: 1
- Views: 5633
Electronic Design IFD: JFET Curve Tracer
Simple Circuit Turns Scope, Function Generator Into JFET Curve Tracer:
https://www.electronicdesign.com/displa ... rve-tracer
https://www.electronicdesign.com/displa ... rve-tracer
- Wed Sep 29, 2010 1:44 pm
- Forum: Pro Audio Design
- Topic: Channel and Output fader implementation
- Replies: 5
- Views: 10458
Re: Channel and Output fader implementation
Thanks JR. I suppose another advantage of fully-balanced might be 6 dB more headroom.
- Tue Sep 28, 2010 1:06 pm
- Forum: Pro Audio Design
- Topic: Channel and Output fader implementation
- Replies: 5
- Views: 10458
Re: Channel and Output fader implementation
Sean - Thank you for joining us! Here's a post where we discuss using VCAs whose current outputs are directly summed into the mix amp: http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=6&t=211 IIRC the thread meanders a bit but at 16 pages it should keep you reading for awhile. There ...
- Sat Sep 25, 2010 5:09 pm
- Forum: Pro Audio Design
- Topic: LC filter experiments, in Pultec MEQ context
- Replies: 15
- Views: 31722
Re: LC filter experiments, in Pultec MEQ context
I assume you mean keeping the same sort of network, and just floating it all, as opposed to doing a truly balanced network with 2x parts. This sounds worth hearing. I wonder what typical inductor headroom really is, and how much they differ comparing original versus the various clones, and then how...
- Sat Sep 25, 2010 3:38 pm
- Forum: Pro Audio Design
- Topic: LC filter experiments, in Pultec MEQ context
- Replies: 15
- Views: 31722
Re: LC filter experiments, in Pultec MEQ context
What I was suggesting is a little different. What I'm proposing here is a hybrid Pultec with solid-state electronics that is (almost) fully balanced end-to-end. 1) Lift the ground line at the input transformer and remove the transformer. Receive the input with a 1246 as you've done already. 2) Here'...