The circuit uses a working crystal again used to control the frequency of a colpitts oscillator. This time the output from the oscillator is taken from the emitter and is full wave rectified, the small dc bias will then directly cause the second BC548 to light the LED.
Read More Source: Andy Collinson
http://www.mitedu.freeserve.co.uk/Circuits/Testgear/crystal.htm
Thank you.
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This entry was posted on Sunday, April 20th, 2008 at 9:39 am and is filed under Lighting, meter.
