Pro Audio Design Forum

I should be receiving boards Tuesday.

More sound files. Davie Allan and The Arrows "Shape of Things to Come" originally recorded in LCR. Sequence is Stereo, L+R then I+Q. https://proaudiodesignforum.com/content/Quadrature_Summing_Filter_Davie_Allan_Shape_Of_Things_Demo.wav https://proaudiodesignforum.com/images/jpg/Quadrature_...

While I'm waiting on Quadrature Summing Filter boards to be delivered I fired up the Protoboard to make some sample files. Some time ago I downloaded a problematic synth sample from Gearspace that was posted in this thread: https://gearspace.com/board/so-much-gear-so-little-time/1137281-mix-element...

Quadrature Summing Filter boards are on order and should be available in about 7-10 days.
I'll be building one to check the layout as soon as they arrive.
The BOM for parts excluding PC board looks to be about $101 US.

This is the current schematic for the "Quadrature Summing FIlter" layout. I decided to eliminate the ability to route the separate I and Q components to the final outputs to save a relay and board space. This mode would not be used in most applications. I and Q now come up on a header whe...

Putting the final touches on the "Quadrature Summing Filter" board. https://ka-electronics.com/images/jpg/Quadrature_Summing_Filter_PCB_Layout.JPG I eliminated the relay which forwarded I and Q as "stereo" to the final output. That would almost never be used except for people wa...

I used to use duckduckgo all the time and simply overlooked them.

Duckduckgo ties with presearch.

I've done screen captures of all of them including duckduckgo that I should post.

Search Engine Performance Rankings I just did a quick test of search engines. Google came in dead last. The search term was for an article posted here on March 14, 2022 that has been viewed about 2200 times. I used the term "Component Matching Minimizes IM Distortion in the Demrow-Cohen Balanc...

Digi-Key Now Stocking Linear Integrated Systems Not sure when Digi-Key became a Linear Integrated Systems distributor - they're not listed on the Linear Systems website. https://www.digikey.com/en/supplier-centers/linear-integrated-systems LSK170: https://www.digikey.com/en/products/filter/transist...

Alps Potentiometer Taper Chart

I'm always having to look this up and Alps keeps moving the link...