Search found 5447 matches
- Wed Apr 15, 2009 2:07 pm
- Forum: Pro Audio Design
- Topic: NE570-based NR compander (P-522) by JR
- Replies: 34
- Views: 70331
Re: NR compander (P-522)
If you are talking about that diode break where above a P-P voltage another feedback path becomes active, that will was done to sound better that hard clipping, and IIRC with the 570- series gain cells the could get nasty if they are overdriven. So it was a lesser evil decision ands only expected t...
- Wed Apr 15, 2009 9:44 am
- Forum: Pro Audio Design
- Topic: An Improved Servo for the THAT1510 and THAT1512
- Replies: 32
- Views: 88395
Re: An Improved Servo for the THAT1510 and THAT1512
Thanks everyone. I fired up the desk lamp and temperature probe. With the global servo defeated I looked at the offset drift in the 1510 output op amp with it operating at 6 dB gain. At 69 degrees F the output Vos was a trimmed -0.11 mV. At 129 degrees -1.15 mV. It took about a 34 degree C rise to &...
- Wed Apr 15, 2009 7:31 am
- Forum: Pro Audio Design
- Topic: An Improved Servo for the THAT1510 and THAT1512
- Replies: 32
- Views: 88395
Re: An Improved Servo for the THAT1510 and THAT1512
Thanks Crusty. The switch I used is indeed break-before-make. Between every gain step there is a brief return to unity gain. The temperature drift of the THAT1510 isn't characterized in the data sheet. My concern would be with the Vos of the internal output op amp and the OP07 driving the ref pin. D...
- Tue Apr 14, 2009 1:04 pm
- Forum: Pro Audio Design
- Topic: An Improved Servo for the THAT1510 and THAT1512
- Replies: 32
- Views: 88395
An Improved Servo for the THAT1510 and THAT1512
I see a lot of questions here and elsewhere asking about servos for the THAT1510 and THAT1512. This post will discuss an improved servo circuit which has the goals of reducing switching clicks during gain change and eliminating a large value Cgain. An added benefit of this circuit is that output of...
- Mon Apr 13, 2009 4:52 pm
- Forum: Build
- Topic: 4 Gang 24 Pos Silver Rotary Switches on eBay
- Replies: 4
- Views: 22451
4 Gang 24 Pos Silver Rotary Switches on eBay
I stumbled on this listing the other day and thought of our mastering engineers and preamp builders:
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... FP:US:1123
http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... FP:US:1123
- Sun Apr 12, 2009 3:02 pm
- Forum: Pro Audio Design
- Topic: NE570-based NR compander (P-522) by JR
- Replies: 34
- Views: 70331
Re: NR compander (P-522)
I use an EMU-0404 internal. Apparently Asus Xonar D2's are testing well at RMAA but I've never found the summary for it. The product "specification" page is here: http://usa.asus.com/products.aspx?l1=25&l2=144&l3=0&l4=0&model=1769&modelmenu=2 This is the chipset informa...
- Sun Apr 12, 2009 11:34 am
- Forum: Pro Audio Design
- Topic: NE570-based NR compander (P-522) by JR
- Replies: 34
- Views: 70331
Re: NR compander (P-522)
It seems you could cover a lot of the features you asked about with a decent computer sound card and some software. Probably some freeware out there that does some of that. Crusty - Take a look at Visual Analyser for basic tests. http://www.sillanumsoft.org/ And RMAA: http://audio.rightmark.org/pro...
- Sat Apr 11, 2009 1:33 pm
- Forum: Pro Audio Design
- Topic: Mid Side M-S Matrix Uses No Precision Resistors
- Replies: 271
- Views: 619371
Re: Mid Side M-S Matrix Uses No Precision Resistors
Guys - Roger did a great job on the layout. I'm ordering boards today with delivery expected in about two weeks. I'll be sure to announce when they become available. MS boards can be ordered from this web page by sending an e-mail: http://www.ka-electronics.com There will be plenty of boards availab...
- Wed Apr 08, 2009 6:01 pm
- Forum: Pro Audio Design
- Topic: Mid Side M-S Matrix Uses No Precision Resistors
- Replies: 271
- Views: 619371
Re: Mid Side M-S Matrix Uses No Precision Resistors
Thanks Miko!
Got it built. Now for some electrical tests...
Got it built. Now for some electrical tests...
- Wed Apr 08, 2009 10:42 am
- Forum: Pro Audio Design
- Topic: Mid Side M-S Matrix Uses No Precision Resistors
- Replies: 271
- Views: 619371
Re: Mid Side M-S Matrix Uses No Precision Resistors
Thanks for joining us Brock! I just got the test run with silkscreen and solder mask. Great work Roger! https://www.ka-electronics.com/Images/jpg/MS162_Photo.JPG We rotated the insert connectors 90 degrees. I've dry-fitted the Phoenix connectors to check the mechanicals. After I've built this one we...