T&L Publications

Analog Troubleshooting by Robert Pease and Analog Circuit Design by Jim Williams. Both are published by Newnes.

You don't mention the rectifier configuration that you are using. You are going to have a voltage multiplication of 1.414 for a full wave bridge. You can get around the voltage differential problem by putting a zener on the reference (ground) pin. But, that will raise your minimum output voltage.<p>...

Oops, sorry. I posted to the wrong topic. Another victim of 'sometimers disease'!

You don't mention the rectifier configuration that you are using. You are going to have a voltage multiplication of 1.414 for a full wave bridge. You can get around the voltage differential problem by putting a zener on the reference (ground) pin. But, that will raise your minimum output voltage.<p>...

You could also use "toaster wire (nichrome)", like a heat gun element. Some high current lab supplies use this method.

You can use a fixed, 3 terminal regulator for this. Then hang a pre-load resistor about 560 ohms @ .5W across the output. This should keep the voltage from floating high.

Apologies to Edd for my previous post,I addressed the wrong person. I had an attack of 'old timers'. Sorry.

Edd, Spring reverbs are quite common in new gear. They are available in 3 lengths and a number of different I/O impedences. You can get new ones at Mojo tone (www.mojotone.com) or Antique Electronic Supply. They are fairly cheap, typically under $30.00.<p>Input impedences usually range from 8 ohms t...

A small transformer and a potentiometer would be the easiest. You can find small,inexpensive transformers at Mouser (mouser.com). You can also find solutions at epanorama.net. Click on the audio links heading.

Minor correction to dacflyer's statement. Stormscopes are not radar. I used to build, test and, troubleshoot them for the company that makes them. The antenna consists of a pair of x-y current loops, used for direction finding and a Marconi stub for the E field. When an electrical discharge is detec...

Try looking at frequency to voltage conversion circuits. I have one in my National Semiconductor Linear Applications book, using the LM1819. You can probably get a pdf at their site, www.national.com. Usually, the cable rotation is sensed by an optical interrupter or Hall effect set-up. This generat...

I would surely trade some things with you.I may be able to set you up with some IC's or a chassis.<p>I would be interested in some tubes although,I don't usually go in for used power tubes.BTW,do you still have the chassis?

If it was a Hammond B3 with the Leslie,it would be worth more whole.Trying to find a home for an organ nowadays is tough.
Gut it and scrap it I say.But keep the power amplifier chassis.
BTW how much?

You can try putting a small capacitance from the base to collector,on the order of 10 - 100pF.This is an old technique that has been replaced by schottky devices.Oddly enough these were known as 'speed-up' caps.The capacitor keeps the base-emitter junction from going into saturation. You know,there ...

Motorola makes some 1" piezo tweeters that are good out to 50 kHz.