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AS Level     Op Amp     Delta Lux     Gain     >Schmitt Astable<     Schmitt Trigger     Virtual Earth     Voltage Follower    

Op Amp Schmitt Astable


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RC Circuit Explanation

This oscillator will produce a square wave output.

This is a nice example of ...

Op Amp Schmitt or Relaxation Oscillator Schmitt or Relaxation Oscillator

The Circuit Signals

Schnitt or Relaxation Oscillator Signals

Schmitt Trigger or Relaxation Oscillator with a Capacitor - Falstad Simulation

Schmitt Trigger or Relaxation Oscillator with an Inductor - Falstad Simulation

This circuit has been tried and tested. A mains transformer primary winding was used for the inductor. With the indicated resistor values, the oscillator ran at 5.5 Hz. Then the secondary winding was tested. It oscillated at about 1300 Hz due to the lower inductance. Using an Alpha-Kit solenoid, the frequency was about 11 kHz and the inverting input had quite a clean sine wave on it. This circuit ought to be useful in an Inductance Meter but the resistance of the wire inside the inductor makes it much harder to correctly calculate the inductance.

 

The blue trace is a good square wave output. The red trace is at the inverting input of the op amp.

Schmitt or Relaxation Oscillator Resistor Inductor (RL) Signals

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