Sounds like a turntable speed control device, when you said did for, did you
mean that literally, ie killed?


Brian

--
----- -
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please!
"Phil Allison" wrote in message
...
Eiron wrote:


I became quite adept at fixing Z30s in my youth.
http://rk.nvg.ntnu.no/sinclair/audio/z30.htm
Maybe a much bigger heat sink would have helped
but they hardly ever survived a party.


** Someone gave me one Z30 module and a "Project 60" manual in the early
70s - it all sat in a drawer for several years until I figured out a use. In
the manual was a schem for making the Z30 into a power sine wave oscillator
using a Wein bridge circuit. See figure 4.16.1.a

http://www.epanorama.net/sff/Audio/C...oject%2060.pdf

I quickly lashed up one built to oscillate at 67Hz, with a few Hz range of
adjustment. Used with an unregulated 30V supply, it ran nicely with the
output feeding the 8ohm winding of a 15W UL output tranny from an old valve
amplifier.

The primary was used to drive a small synchronous motor with a 240V pure
sine wave. The finished version had a toggle switch to bring the frequency
down to a nominal 50Hz.

This is a pretty tough job for a puny Sinclair Z30 module, but it never
failed in over 20 years of use.

Who can guess what it did ?


..... Phil