Posts Tagged ‘squarewave oscillator’

Alternate 555 Oscillator

This is a slightly simpler circuit than the one above. The circuit uses just one resistor and one capacitor with the 555 timer IC to create a stable and reliable oscillator with an output that it a true squarewave.
The formula for calculating the frequency is:

f=1/(1.4*R*C).

The values in the formula are expressed in ohms, farads, seconds and hertz. This formula is much simpler than that of the previous circuit. With the values shown on the circuit, the frequency is calculated as 1050Hz, but like the previous circuit, this arrangement can operate at frequencies up to around 500kHz.
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Read More Source: http://www.geocities.com/electronics3456/555circuits.html
Thank you.

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Simple Pulse Generator by IC 555 Timer

This is a simple pulse generator circuit or standard astable oscillator circuit for IC 555 timer,NE555N IC.
Use for digital Logic circuit. IC 555 use voltage supply 5V to 15V.
the output frequency will be approximately 1kHz and the duty cycle 50-50, The output’s frequency is control by R1.
Detail more, Please read in this image circuit.

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Simple Square wave Generator by BC549

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.

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