Pro Audio Design Forum

"Designer's Guide to Measuring Op Amp Distortion," Jerald Graeme, EDN, February 17, 1992. In this two part series Graeme provides the means to measure the very low distortion of the modern op amp. https://www.ka-electronics.com/images/pdf/Measuring_Op_Amp_Distortion_Graeme_EDN_February-17-...

I monitor web stats to see what people have found and what they're looking for.

This one search phrase really caught my eye. How did they land here?

energy transformation in washing machine into sound energy

Wow.

"Life Beyond 20kHz," David Blackmer, Sound and Video Contracting, September, 1998. https://www.ka-electronics.com/images/jpg/Life_Beyond_20kHz_Blackmer_SVC_Sep-1998_small.JPG https://www.ka-electronics.com/images/pdf/Life_Beyond_20kHz_Blackmer_SVC_Sep-1998.pdf (pdf 4 MB) https://www.svcon...

"Op Amps and Counter Form Low-Cost Curve Tracer," Clay, Rash, Walden, Electronics, Sep-14-1978 The Electronics World curve tracer posted here is a very popular download. This is another curve tracer installment from a 1978 Electronics "Designer's Casebook." https://www.ka-electr...

I've been informed by Vishay that production of the PBG-series will cease in 2012.

OK, so the 150 Ohm input transformer bridges the summing node. Well it is a summing node. Placing a transformer there will result in the 1570 losing feedback. You could, as you suggest, use a switch. But I wouldn't. You don't want any stray capacitance there. I'm also pretty sure that you'd have som...

There are a lot of folks who like to experiment using different mic pre's to get their makeup gain. I tried this with my Hardy M1's, which have a Jensen transformer on their input at an input impedance of 150 Ohms, and only succeeded in making the 1570 circuit go into wild oscillation. If I underst...

"Removing the Constraints of C-MOS Bilateral Switches," W. Chomik, A.J. Cousin, Electronics, December 7, 1978. This is an old Idea for Design which I've used in modified form. This circuit is a good first start with both a series and shunt switch but with the switch outside the feedback l...

The Sanken SI-series of hybrid audio power amps have been discontinued for a very long time but I often see online requests for datasheets. Sanken SI-1010Y Power Amp Datasheet Sanken SI-1025E and SI-1050E Power Amp Datasheet Sanken SI-1000G-series: SI-1010G, SI-1020G, SI-1030G and SI-1050G Power Am...

The Signetics NE545 Dolby B Processor datasheet is a little hard-to-find.

Signetics NE545 Dolby B Decoder Datasheet