LM324 or LM358 Schmitt trigger and relay driver

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07:07:47

The first opamp buffers the input to provide a high input resistance, this feeds the circuit built around the second opamp which is the actual Schmitt trigger. The voltage source connected to the -Ve  input of this opamp determines the midpoint of the input range, 6 volts in this case. The opamps have been set up to behave like an LM324 / LM358 connected to a single + 12 volt supply, the 68 K resistor determines the width of the input threshold window aka its hysterisis, it gets smaller as the value of this resistor is increased

published 8 years ago

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