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The circuit is described at www.redcircuits.com in Home Related Circuits.
Hi pimster987,
As soon as the gated oscillator is activated by a high signal it starts oscillating at a low frequency determined by the values of R4, R5 and C3.
I'll post a circuit simulation later if my PC decides to work properly.
Boncuk
So IC1D turns off when the low part of the square wave is passing and turns back on on the high part. I analyzed the circuit with an oscilloscope but I couldn't get a simulation to work on PSpice. I couldn't find a schmitt trigger NAND gate and I looked everywhere on the net for help but couldn't find any.
No.You can use any NAND gate to simulate the circuit.