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Old 4th Sep 2019, 10:27 pm   #13
MotorBikeLes
Nonode
 
Join Date: Dec 2012
Location: Kirk Michael, Isle of Man
Posts: 2,346
Default Re: Solid State Vibrators -v- Inverters ?

Decades ago, I had a car radio whose vibrator was well past it, and which would not respond to my "mechanical adjustments". After looking thro a few US written library books, I knocked up a simple replacement consisting of a cross coupled multi-vibrator using 2 off OC28 transistors and a couple of (330 ohm from memory) emitter resistors. I optimised the resistor values by way of a "hot finger" on each transistor. It worked and I sold the radio on a couple of years later.
Les.
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