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cuckoo sound generator


phil7

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Hi Phil,
Welcome to our forum. ;D
The project is here: http://www.electronics-lab.com/projects/misc/011/index.html
Q1 is fine. Its base-emitter junction is connected backwards so that it has avalanche breakdown like a zener diode. When it has avalanche breakdown then it makes a lot of white noise. Its collector isn't used. ;D

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