Circuit Project Electronic

This is a simple pulse generator circuit with IC 555 timer.
Use for digital Logic circuit. IC 555 use voltage supply 5V to 15V.
The output’s frequency is control by R1.
Detail more, Please read in this image circuit.
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To drive ignition coils is to use a 555 timer pulse generator. A 555 generates a square wave output that triggers the 2N3055. Adjusting the two potentiometers and the value of the capacitor will change the frequency of the output.
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Three switchable frequencies: 100Hz, 1KHz, 10KHz
1.5V battery operated, minimum parts counting
Parts:
R1____________560K 1/4W Resistor
R2____________680R 1/4W Resistor
R3______________2K2 1/4W Resistor
R4____________150K 1/4W Resistor
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 [...]