555 multivibrator like power oscillator
You can even build a small SMPS with this or even control the temperature of your soldering iron using the SSR solid state relay circuits in power section, then you need to think and design the cycle time of a soldering iron heat control system, it will be in seconds but then above circuit is running at audio frequencies, then you have to work that out yourself..
Linear PWM or Pulse width Modulator on 555
The PWM uses the Control Voltage Pin 5 like the above
circuit. A matched pair of PNP transistors are used to create
a Constant Current Source. This way this circuit below is more
Linear that the circuit above, this is a PNP Current Mirror.
The waveform you will see across the Capacitor is a Nice
Images above are from the Original Signetics 555 Datasheet
20th Apr 2020
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