How to make a easy signal generator with NE555.
◾ Circuit diagram - https://drive.google.com/file/d/1M8pW...
Function Description
In the circuit, D1 is the anti power reverse diode, and C9 is the filtering capacitor.
IC1, R1, RP1, and C2 form a square wave generator, and the signal is output from pin 3 of IC1. C1 is the anti-interference capacitor. The square wave output from the third pin of IC1 is divided by RP2 and short circuited to S1 with a short-circuit block to output the square wave at the output end.
The other path passes through RP3 voltage division, C3 coupling, and an integral circuit composed of R5 and C7, forming a sawtooth waveform output by S2.
After passing through the integration circuit composed of R3 and C8 in the next stage, a triangular wave is formed and output by short S3.
Finally, after passing through R4, a filter composed of C7, R5, VT1, and R6 is used to extract the sine wave from the VT1 collector, output by short S4.
R7, R8, and VT2 form an emitter following amplifier circuit, and the final signal is coupled by C8 and output from the J2 output terminal.