Simple Square wave Generator by BC549| Circuit Project

Three switchable frequencies: 100Hz, 1KHz, 10KHz
1.5V battery operated, minimum parts counting

This simple circuit generates a good and stable 1V peak-to-peak square wave at 100Hz, 1KHz and 10KHz using a single 1.5V cell as power supply.
An useful feature of this circuit is that frequency changes can be obtained by switching only one capacitor at a time.
Current consumption is about 600µA.

Parts:
[...]
C1_____________12nF 63V Polyester Capacitor
C2______________1n2 63V Polyester Capacitor
C3____________120pF 63V Polystyrene or ceramic Capacitor
C4,C5__________10µF 25V Electrolytic Capacitors
Q1,Q2________BC549C 25V 100mA NPN High-gain Low-noise Transistors
SW1____________SPST Slider Switch
SW2____________1 pole 3 ways Rotary Switch
B1_____________1.5V Battery (AA or AAA cell etc.)

Please read more at the original source: http://www.redcircuits.com//Page74.htm
Thank you.

This entry was posted on Saturday, January 19th, 2008 at 1:16 pm and is filed under oscillator generator.

Circuit diagrams and schematics - Electronic projects

Simple Square wave Generator by BC549 (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

Simple Square wave Generator by BC549