Analog Audio Application Notes

This 24 page guide has been very popular. It has been hailed as “...required reading for all broadcast engineers.” by Richard Sequerra.  “We were able to change our engineering standards throughout the CBC as a result of this paper.” Tom Holden Manager, . Systems Engineering - Radio, CBC Toronto.

We think you will also find it useful as well. This file, approximately 100 k bytes with graphics, has been broken up into 9 pages, including the index, to make downloading faster.  The "A Clean Audio Installation Guide" is also available as a PDF file.

Why should you care? Who but the animals can hear it? The answers may surprise you!

How to avoid some common pitfalls.

Alan Silver, President of Connoisseur Society, Inc. New York, NY., shares his experience. Philips of Japan was the customer, jazz pianist John Lewis the artist.Pan-Pot Circuit

Many devices being touted as audio DAs simply will not cut the mustard at the critical time when they are most needed, and thus are not the insurance policy you expected them to be. This note examines the technical challenges in audio DAs.

Telephone talk shows and intercom systems, among others, can require a Mix-Minus circuit to interface the studio with the telephone line by way of a telephone hybrid. The mix-minus sends all the studio audio back to the caller but not the callers own audio. Find out how to create simple-to-elaborate mix-minus'.  Please note, this is a relatively large file of 115 k bytes due to the schematic images.

Control of stereo audio may often require the reversal of channel location, correction of polarity, or perhaps mixing of the two channels. At other times an incoming signal may be on only one channel and may need to be placed on both output lines. Find out how to do both with the most convenience and flexibility.

Jack Wells, VP of Engineering at KLRU-TV in Austin, TX tells of his experience with controlling the signals from VTRs.

The combination of a high output headphone amplifier, a high quality mic-preamp, a small project box and some 9 volt batteries creates a very handy tool for the audio installer!

A very handy test set for setting up the stereo recording or broadcast facility.

The HPA-1 Headphone Amp has 300 mA output capability which is just ideal for driving long transmission lines and doing it cleanly!

It is often desirable to monitor the levels on distributed audio PA speaker lines, known as 70 volt lines. It's simple with the right tools. This app-note shows how.