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Electronic Siren

ramussons

Jun 10, 2014
448
Joined
Jun 10, 2014
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448
I remember building a 2 Transistor Siren - Not a 2 tone version, but one that ascends in pitch to a max, and then descends to a very low frequency.
This was in the 70's, from a circuit in Popular Electronics (if I recollect correctly). I have gone through the available archives of PE, but not been able to track it down.
The circuit had 2 PNP transistors, one driving a speaker directly.

Does anyone recollect this piece?
Thanks.
 
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