Pro Audio Design Forum

The third figure down in the TS-1 post (also below) looks pretty clear to me. I'd right-click save-as offline and zoom. JR can explain the circuit. FWIW Q19 looks to be an MPSA06.

only thing missing is the "hand carved by virgins from Unobtainium" label.

I'll have the art department start on a logo.

OK, so the internal build-out with both 1646 outputs in parallel is 12.5R. Connecting a few dots from different threads (and life), One comment made in one of the Bateman capacitor article stuck with me.. the distortion in caps was reduced when driven from low impedance and increased at higher imped...

Cool! Was it the buffered version or a bare 1646? Was there a build-out R?

If it's the headphone amp/buffered version you might be able to drop the 33R build-out. On the HP amps it's there for load short-circuit protection and with a tranny it could be lower.

The Cyril Bateman Capacitor Sound articles featured in the July-December 2002 editions of Electronics World are below. The jpg scans of the original articles were sent to me some time ago (thanks Peter) and I decided to clean them up and assemble pdfs. Thanks also to ricardo for lighting the fire un...

mediatechnology wrote:The NE570 is still made by ON Semiconductor in SMT. The IC is still very popular in cordless phones and wireless mics.

Forgot to mention stomp boxes. Does Cool Audio make the NE570 too? Hmm...

The NE570 is still made by ON Semiconductor in SMT. The IC is still very popular in cordless phones and wireless mics. Link to ON Semi NE570 applications: https://www.onsemi.com/PowerSolutions/supportDoc.do?type=AppNotes&rpn=NE570 The ON NE570 datasheet is here: https://www.onsemi.com/pub_link/C...

I wonder if we used 4 caps with two pair in series each connected opposite polarity with one pair + to +, and the other pair - to -. It seems this should both protect against DC and could cancel distortion. It seems a little Rube Goldberg, but this is fringe audio design. :D It may be interesting t...

I'm not sure how protective the reverse breakdown path would be.

Well it might not be. If the even-order distortion cancellation that Sam writes about works it still might be a good reason to use it. One more test for the null-tester.

While I wouldn't expect huge terminal voltages in the mic pre gain leg (same voltages pretty much as the inputs), I have run these down to single digit ohms so surely low impedance, and perhaps several mA of peak current. These are often polarized and 6.3V. They can see amps of fault current and du...