Search found 5477 matches
- Sun May 10, 2009 1:50 pm
- Forum: Build
- Topic: Mid Side M-S Matrix Construction Information
- Replies: 121
- Views: 453781
Re: Mid Side M-S Matrix Construction Information
https://www.ka-electronics.com/Images/jpg/MS162_Photo_1.JPG EDIT: If I understand your question correctly, no. Take a look above. The bottom-most rows are Ground. The jumpers link vertically from insert send to insert return. To disable them just remove the jumper or store it on one pin. Look at BL...
- Sun May 10, 2009 1:20 pm
- Forum: Document
- Topic: Valley People TransAmp, ECG-101 VCA, TA-103 Documents
- Replies: 1
- Views: 10741
Valley People TA-101 TA-102 TA-103 Documents
Valley People TA-103 Application Note https://www.ka-electronics.com/images/pdf/Valley_people_TA-103.pdf https://www.ka-electronics.com/images/jpg/Valley_People_TA-101_TA-102_TA-103_Pinout.JPG Valley People TA-101 TA-102 TA-103 Pinout Note the thermal coupling of the transistor pairs. TA-101 4 NPN ...
- Sat May 09, 2009 12:25 pm
- Forum: Pro Audio Design
- Topic: Mid Side M-S Matrix Uses No Precision Resistors
- Replies: 271
- Views: 641540
Re: Mid Side M-S Matrix Uses No Precision Resistors - Boards 5/1
Thanks for joining us Andy! Couple questions though, is there a schematic?! Not a complete one yet. That was a goal for last weekend which turns out to have been one without power for about a day due to lightning strike. I'm a little behind. You can piece all the bits together and can't go wrong usi...
- Fri May 08, 2009 9:51 pm
- Forum: Build
- Topic: Mid Side M-S Matrix Construction Information
- Replies: 121
- Views: 453781
Mid Side M-S Matrix Construction Information
This is a clone of the post in the original thread. We might want to put build questions in this thread. MS Mid Side Encoder/Decoder PC Boards: https://ka-electronics.com/shop/index.php?route=product/search&search=Simple%20MS Update 5/12/2015: PDF Assembly Instructions are here: https://www.ka-...
- Fri May 08, 2009 8:57 pm
- Forum: Pro Audio Design
- Topic: Mid Side M-S Matrix Uses No Precision Resistors
- Replies: 271
- Views: 641540
Mid Side M-S Matrix Construction Information
I've gotten a little behind on creating and posting documentation. Wayne is stretched thin. I've cloned this post in the Build Subforum. We might want to discuss build questions here: http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=7&t=262 Here's a preliminary bill of materials: 13)...
- Thu May 07, 2009 3:04 pm
- Forum: Pro Audio Design
- Topic: Old: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 212
- Views: 414415
Re: A Direct-Coupled Input-Capacitorless Active Mic Preamp
No problemo and a great question. IIRC correctly I measured the peak current into the 1510 it was around 8 mA vs. the >>3A when input caps are present. I tried just about every way I could to blow up a 1510. I failed, it didn't. That particular fault, when input caps are used (one input pulled up, t...
- Thu May 07, 2009 12:27 pm
- Forum: Pro Audio Design
- Topic: Old: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 212
- Views: 414415
Re: A Direct-Coupled Input-Capacitorless Active Mic Preamp
OK, here’s what I measured, although unexpected: AT 4033 serial 39XX DCR=~740K offset=6.8mV AT 4033 serial 90XX DCR=20K offset=0.3mV AT 4033 serial 95XX DCR=22K offset=0.7mV TLM103#1 DCR=9K5 offset=0.8mV TLM103#2 DCR=9K4 offset=0.9mv Schoeps CMC5 body DCR>2M offset=15.7mV (wow, checked it 3 times) ...
- Thu May 07, 2009 11:29 am
- Forum: Pro Audio Design
- Topic: Old: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 212
- Views: 414415
Re: A Direct-Coupled Input-Capacitorless Active Mic Preamp
I found that with some cap-coupled inputs it can indeed take awhile to settle, particularly the common mode voltage.
If the preamp has been off awhile it takes ages for the capacitors to re-form.
What sort of differential (pin 2 to 3) offsets are you seeing?
If the preamp has been off awhile it takes ages for the capacitors to re-form.
What sort of differential (pin 2 to 3) offsets are you seeing?
- Thu May 07, 2009 10:12 am
- Forum: Pro Audio Design
- Topic: Old: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 212
- Views: 414415
Re: A Direct-Coupled Input-Capacitorless Active Mic Preamp
Glad I thought to ask. When you get a chance you might try it with a couple of 6K81s pulled up to 48V.
If you don't have an easily obtainable 48V supply you can get 45V from the IP27-18 by stacking all three or use the dual 20V and a 9V battery in series.
I'm curious about Bruno's TLM103s....
If you don't have an easily obtainable 48V supply you can get 45V from the IP27-18 by stacking all three or use the dual 20V and a 9V battery in series.
I'm curious about Bruno's TLM103s....
- Thu May 07, 2009 9:05 am
- Forum: Pro Audio Design
- Topic: Old: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 212
- Views: 414415
Re: A Direct-Coupled Input-Capacitorless Active Mic Preamp
Wow, cool - thanks! What we're looking for is the offset developed by the microphone when phantom is applied through the customary 6K81 pull-ups. It cannot be loaded by a transformer but an active input, or just the pullup resistors as load, will tell us how symmetric the current draw is. The DC pot...