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In this circuit I’m using a 555 timer (astable multivibrator) as a signal oscillator and a diode clipper as a voltage converter. When bias is applied to this circuit, the 555 timer produces a square wave output with positive and negative levels through pin 3. When the square pulses reaches the diode clipper, positive pulses are grounded and negative pulses only are conducted to the output. In other words, every positive cycle is grounded and only the negative cycles comes to the output, the output square pulses are separated as negative output by using a diode clipper.
Diode clipping as mentioned above is when the diode which comes off the 22uF capacitor which is directly connected to pin 3 conducts during the positive cycle and drives the signal to Ground, meanwhile the other diode also connected to the 22uF capacitor in the off. During the negative cycle other diode also connected to the 22uF capacitor conducts signal and brings it to the output, but the diode which comes off the 22uF capacitor which is directly connected to pin 3 turns off. Just reiterating the fact that every positive cycle is grounded and only negative cycle comes to the output.
A load hasn’t been applied to this circuit but please feel free to apply a load and observe the results. If you have any questions, simply google "negative voltage generator" and discover additional information. Have fun with electronics...😎
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