But sometimes, we do not have them. So we use others ways or ICs probably choose this IC. Op-amp is a good choice. It easy and cheap as well.
How it works
Circuit diagram of simple pulse generator using op amp
We can use the op-amp in many circuits. Now we will use it as an oscillator that high quality.
The pulse is a kid of square-Wave or astable multivibrator. It is the most basic oscillator. The status of signal changes all times.
What is oscillator?
Oscillators convert DCV from a power supply to ACV, pulse.
In the circuit above, it uses an op-amp(IC-1458) as the main component a few parts.
The frequency output is set by value Resistor and capacitor-C1.
The C1 capacitor to change capacitance per frequency value
- 1uF gives 8Hz
- 0.1uF gives 50Hz
- 0.01uF gives 700Hz
- 0.001uF gives 6KHz
In this testing. I use capacitor-C1 of 0.1uF.
We put the IC1b to boost up the output current and to be a buffer to load.
You can use others ICs such as RC4558, LF353 instead of IC-1458.
As the video above, it shows you testing of this circuit.
First of all, I apply a 9V battery to the circuit. Then, I want to look at the output waveform, so use a small oscilloscope. It can show a square waveform.
Next, I measure that output voltage with a digital voltmeter, it can read about 3V.
After that, I measure the output frequency, it is about 50Hz.
This circuit is just a simple experiment. We have not learned the principles of it. Also, it is not suitable for practical using since the output is not steady.
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