Simple Square wave Generator using transistors

Posted by Ilias-Man On Saturday, February 4, 2012 2 comments
This simple circuit generates stable square wave at differents frequencies, using from 3v to 12v cells as power supply.
An useful feature of this circuit is that the frequency can be changed by changing a capacitor value, a switch can be add to choose between various frequencies.



hammiy said...

Whats the max frequency i can get from this...?

LostinTronics said...

About 200kHz with 10pF capacitor for C1 and 100nF for C4 and 1.5V supply

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