that can be easily purchased from your local electronic store. The IC is working in astable multivibrator mode here. The operating voltage of the circuit is 6V to 12V DC.

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The figure below shows a simple triangle waveform generator circuit using a 555 IC. This is a very simple and low cost technique to make a triangular wave generator. The circuit can be used with many types of electronic test equipments. The heart of the circuit is a famous 555 timer IC

Triangle Wave Generator Using 555 IC Circuit Diagram