Generator Pulse with IC 555

Many devices or electronic components that can be operated with an electric pulse, even they can be adjusted by electric pulses. For example, a stepper motor, for controlling the stepper motor, required stepper motor controllers which produces periodic pulses.

Motor rotational speed is determined by the frequency applied to the stepper motor. Electric pulses can be generated by the oscillator circuit that uses a IC 555 with astable mode.

This circuit operates at voltage range 10-12 V. Frequency generated by this circuit can be calculated by the formula:
F= 1/1,44 {(P1+R4)+ (2(P2+R3)} C2

Duty cycle of this circuit can be adjusted by changing the value in P1 and P2, and the frequency also can also be changed by varying the value in C2.


D1,D2 = 1N4148; P1 = 50K; P2 = 50K; R1 = 220 ohm; R2 = 1K; R3,R4 = 100 ohm; C1 = 0.01 uF; C2 = 100 nF; C3 = 100 uF/16V ; IC = 555; J= jumper.

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MAKES A POWER SUPPLY 12V 5A

Today, when we want to make a device that uses a 12 volt voltage source, we can not possibly carry a large 12 volt PSA's everywhere. Now, to complement the tools that we make it, we must also make an appropriate voltage source with the tools we create.

Here, I will provide a circuit that can be used for devices that operate at a voltage 12 volts.

Many Power Supply circuits is also available on the Internet for free but may be making the circuit that requires a high cost, such as power supply circuit using the LM388, LM388 price per one unit rather expensive. I give this circuit requires only a low cost.

This is the its PCB layout.

Transistors can be replaced with another type with the desired current rating. For the type 2N3055 transistor is rated for currents up to 15A.

There are Power Supply 12V Selection :

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