Search found 5332 matches

by mediatechnology
Fri Dec 08, 2023 4:12 pm
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 234
Views: 362099

Re: Phono Transfer System Construction Information

I edited it quite a bit you might want to refresh one more time.
You're welcome!
by mediatechnology
Fri Dec 08, 2023 4:01 pm
Forum: Build
Topic: Phono Transfer System Construction Information
Replies: 234
Views: 362099

Re: Phono Transfer System Construction Information

Paul - R4 and R5 serve a couple of purposes. I build the boards with them at 100Ω. In high RF environments R4 and R5, along with along with C3+J3, form a differential LP filter around 8 MHz but C3+J3 are mostly for added termination C. What I found however is that with R4 and R5 in circuit and J3 op...
by mediatechnology
Fri Dec 08, 2023 10:53 am
Forum: Build
Topic: Dual Class-A Line and Headphone Output Board Documents
Replies: 133
Views: 387483

Re: Dual Class-A Line and Headphone Output Board Documents

It did but I decided to change the weightings of side that were presented to the sleeve versus the tip and ring to further maximize headroom.

The thread is here - there's a lot I've forgotten: viewtopic.php?p=5607
by mediatechnology
Fri Dec 08, 2023 10:47 am
Forum: Pro Audio Design
Topic: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer
Replies: 43
Views: 41432

Re: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer

By the way, what got you hooked on them? I saw the thread you provided to "Gearspace", but I guess I was too lazy to read everything and make the connections to this thread. emrr originally sent me the link to GroupDIY IIRC and we had a post here once about equal weighting of sum and diff...
by mediatechnology
Fri Dec 08, 2023 8:48 am
Forum: Build
Topic: Dual Class-A Line and Headphone Output Board Documents
Replies: 133
Views: 387483

Re: Dual Class-A Line and Headphone Output Board Documents

Crosstalk at 1 kHz with a 20 ohm load is not fantastic. I measured about 59 dB. Something about the current flow through a Left/Right channel headphone jack that has a common ground. It's close to 90 dB with no load, so the crosstalk is not due to any design error. Using 60 dB to round out the numb...
by mediatechnology
Fri Dec 08, 2023 4:53 am
Forum: Pro Audio Design
Topic: Balancing Resistors Reduce Voltage Follower Common Mode Distortion
Replies: 11
Views: 8601

Re: Balancing Resistors Reduce Voltage Follower Common Mode Distortion

I remember that article. Thanks for linking to it!
by mediatechnology
Fri Dec 08, 2023 4:52 am
Forum: The Peabody Lounge
Topic: Banned from GDIY but still alive
Replies: 5
Views: 544

Re: Banned from GDIY but still alive

It's a sleepy town without much action at night but the sidewalks never roll up.
by mediatechnology
Fri Dec 08, 2023 4:50 am
Forum: Pro Audio Design
Topic: The Studer "90°" Dome Filter Stereo to Mono Quadrature Summer
Replies: 43
Views: 41432

Re: The Studer "90° Filter" Stereo to Mono Summer/Recorrelator

I tried to match the Studer component values using the equations from Weaver. studer90m.JPG Six of the eight resistors came close, but two were off by more than 10% ? Calculated phase difference from the Studer schematic studer90a.JPG Calculated phase difference from the Weaver values studer90t.JPG...
by mediatechnology
Wed Dec 06, 2023 8:28 am
Forum: Build
Topic: Dual Class-A Line and Headphone Output Board Documents
Replies: 133
Views: 387483

Re: Dual Class-A Line and Headphone Output Board Documents

Bob, thank you for posting this! I just looked back and you bought the assembled board from me on September 15, 2015. USPS Priority Mail was only about $6 then. You and the late Joe Neil were the first two customers in my store. My how time flies... I'll take a look at the data and figure out how ma...
by mediatechnology
Tue Dec 05, 2023 4:23 am
Forum: The Peabody Lounge
Topic: Banned from GDIY but still alive
Replies: 5
Views: 544

Re: Banned from GDIY but still alive

Welcome!
I was wondering about that.
What an interesting story. Very similar to my 2007 exit.
Nice to see your avatar around these parts.