Search found 53 matches

by KMN
Sun Aug 02, 2020 1:48 pm
Forum: Pro Audio Design
Topic: Mid Side M-S Matrix Uses No Precision Resistors
Replies: 271
Views: 619946

Re: Mid Side M-S Matrix Uses No Precision Resistors

How did you do the decoders with THAT1246's? I've done it before and it requires some tricks since the internal resistors do not have equal value. It added stages so I chose an alternate method Hello Wayne and the forum . Thank you again for hosting this forum where conversations like this can exis...
by KMN
Fri Oct 25, 2019 3:37 pm
Forum: Build
Topic: Flat Balanced Input Moving Coil Phono Preamp Construction Information
Replies: 56
Views: 207993

Re: Flat Balanced Input Moving Coil Phono Preamp Construction Information

Sorry if I missed it. Is there a BOM or a cart or a set up for this?
by KMN
Fri Oct 25, 2019 3:31 pm
Forum: The Peabody Lounge
Topic: Engineering malpractice
Replies: 8
Views: 5623

Re: Engineering malpractice

https://www.harborfreight.com/hand-tool ... 63644.html

Maybe one of these? I love mine. I use it for trailer hitches, bridge girders, etc.
by KMN
Wed Jul 24, 2019 3:02 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: 9184

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

I found this. I beg your pardon, Wayne, if linking it turns out to be some copyright violation. Some of the schematics use an extra transformer winding for feedback.http://lcweb2.loc.gov/master/mbrs/recor ... Misc.).pdf
by KMN
Tue Jul 23, 2019 11:58 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: 9184

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

Did you measure the signal coming off the tertiary when you energized the primary? The 9 ohms could mean there is a step up there too but might also just mean smaller wire diameter. Curious if the term you've used "tertiary winding" is that yours or is it in the spec sheet? The reason I as...
by KMN
Mon Jun 17, 2019 9:35 pm
Forum: Test, Measurement and Repair
Topic: Digilent Analog Discovery 2
Replies: 4
Views: 36797

Re: Digilent Analog Discovery 2

Have you guys seen these Pico scopes? All these choices. We are living in the future! https://www.picotech.com/products/oscilloscope
by KMN
Tue Jun 04, 2019 11:20 pm
Forum: Document
Topic: Bootstrapped Op Amp Articles
Replies: 34
Views: 188556

Re: Bootstrapped Op Amp Articles

I think I may have an excuse for trying a bootstrapped opamp circuit. In my case to minimize distortion. I was looking for an audio grade op amp for doing filters at +/-36V rails, where the non inverting configured inputs may see up to full rail voltage. Power output is very low but precision at lar...
by KMN
Fri Apr 26, 2019 9:40 am
Forum: Pro Audio Design
Topic: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851
Replies: 499
Views: 772486

Re: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851

Wow. That is impressive, especially after learning about the the details of the hum torture chamber you are running it in. That's a lot of gain and a lot of cable with all that stray field around. I think I might need one too.
by KMN
Thu Apr 25, 2019 10:27 am
Forum: Pro Audio Design
Topic: A Low Noise Balanced Input Moving Coil Preamp Using the ZTX851
Replies: 499
Views: 772486

Re: Out-of-band and Flux Loop Tests

I'll leave a 5 mm space on the PCB for a 1 nF film C for problematic RFI situations but its not required for stability. This post is a bit late to the party. Did you ever try with moving magnet inductances? Maybe some of your customers, couldn't imagine who they might be, would want to try running ...