Search found 5474 matches
- Thu Sep 02, 2010 6:45 pm
- Forum: Pro Audio Design
- Topic: THAT 1570 1510 and 1512 Input/Output Circuits
- Replies: 22
- Views: 55044
Re: THAT 1570 1510 and 1512 Input/Output Circuits
What about using a FET buffer (LSK170?) with say 2K source and drain loads and also use those loads as the 1570's bias resistors? The +/- inputs of the 1570 can be treated as independant "halves." I'm wondering if you AC couple the Rgain line (or 1570 outputs) if you can overcome the Vgs t...
- Fri Aug 20, 2010 12:39 pm
- Forum: Pro Audio Design
- Topic: Mid Side M-S Matrix Uses No Precision Resistors
- Replies: 271
- Views: 640940
Re: Mid Side M-S Matrix Uses No Precision Resistors
True about the drop-out beween positions. In the mic preamp the gain drops to unity for a few ms between steps but it wasn't too audible. Your mastering situation however would require seemless switching. I think that was the motivation for bruno2000 (live) to use pots in his preamp build.
- Fri Aug 20, 2010 12:30 pm
- Forum: Pro Audio Design
- Topic: Mid Side M-S Matrix Uses No Precision Resistors
- Replies: 271
- Views: 640940
Re: Mid Side M-S Matrix Uses No Precision Resistors
OK, got it. Absence of serial errors is the key IMHO.
I wished I had some of the old Kay Elemetrics attenuators...
I wished I had some of the old Kay Elemetrics attenuators...
- Fri Aug 20, 2010 11:45 am
- Forum: Pro Audio Design
- Topic: Mid Side M-S Matrix Uses No Precision Resistors
- Replies: 271
- Views: 640940
Re: Mid Side M-S Matrix Uses No Precision Resistors
+1 what JR. said.
The predecessor to the iPad was the hPad. Both trace their origins to garages.
http://www.amazon.com/Hewlett-Packard-F ... 654&sr=8-1
The predecessor to the iPad was the hPad. Both trace their origins to garages.
http://www.amazon.com/Hewlett-Packard-F ... 654&sr=8-1
- Fri Aug 20, 2010 7:09 am
- Forum: Pro Audio Design
- Topic: Mid Side M-S Matrix Uses No Precision Resistors
- Replies: 271
- Views: 640940
Re: Mid Side M-S Matrix Uses No Precision Resistors
I did the calculations for the potentiometer style attenuator. I even learned Reverse Polish Notaion to do it. Thanks iPAD! I ordered the resistors and did a mock up. The good news is that I basically got it right. The bad news is that even with .1% resistors the accuracy varies more than 0.2dB per...
- Mon Aug 16, 2010 11:18 am
- Forum: Pro Audio Design
- Topic: summing mixer with monitor control
- Replies: 13
- Views: 28940
Re: summing mixer with monitor control
JR. makes a good point about Ibias. WRT the 1646 and 120X I don't recall what the typical bias current is. For 124X line receivers (FWIW PNP input) I recall it to be about 900 nA max so it would be high enough - in some cases - to click when switched. For the 1646, to maintain LF balance, I wouldn't...
- Sun Aug 15, 2010 6:15 pm
- Forum: Pro Audio Design
- Topic: summing mixer with monitor control
- Replies: 13
- Views: 28940
Re: summing mixer with monitor control
OK, good. Removing the 300R in front of the 1646 should improve both it's noise floor and output balance.
- Sun Aug 15, 2010 12:25 pm
- Forum: Pro Audio Design
- Topic: summing mixer with monitor control
- Replies: 13
- Views: 28940
Re: summing mixer with monitor control
Thanks for posting this matthias. The design does look very simple, clean and useful. One thing I would examine is R76 and the 300R source impedance (at LF) that is presented to the 1646 input. Ideally you'd like to see something driving a 1646 that's <<100R and ideally directly from the output of a...
- Tue Aug 03, 2010 7:23 pm
- Forum: The Peabody Lounge
- Topic: Another claim on first use of artificial reverb
- Replies: 5
- Views: 9502
Re: Another claim on first use of artificial reverb
I'm finding this hard to believe. Seems like most engineers would have figured it out as soon as they heard it.The other record companies went crazy trying to figure out what we'd done."
- Wed Jul 28, 2010 8:06 am
- Forum: Document
- Topic: DOD Stereo Flanger Doubler R870 Schematic
- Replies: 0
- Views: 7542
DOD Stereo Flanger Doubler R870 Schematic
I was going through some stuff that JR sent me and found this DOD R870 schematic. Thanks for the databook and notes John. I'm organizing my own collection, the books that crazynightowl gave me, and what you sent. I hope to get the more interesting finds scanned and linked. This one's a start: https:...