[sdiy] Fw: 4-Quadrant VCA?

Bernard Arthur Hutchins Jr bah13 at cornell.edu
Fri Sep 15 02:12:13 CEST 2017

The EN#107 write-up on the OTA  4QM as kindly scanned and  submitted by Guy McCusker is here:


and is also listed in the requested item area of the EN website.  Just below that requested item is the link to Ian Fritz's filter bank in the same EN#107, along with filter bank items of my own in EN#115 and EN#116 in the serial listings on the site.   These filter bank items were listed here on SDIY a few months ago, but I am just now getting around to listing them officially.

By coincidence, we were asked about an Electronotes supplement, S-008, and Phillip Gallo was kind enough to scan this and provide a link that is listed in the supplements section of our site.

Busy day.

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