The pulse width of the compact
pulse cum frequency modulator
can be varied by altering the
change-over point of comparator
IC1 with a control voltage via
resistor R1. The hysteresis of the
IC is determined by resistors R3
and R4. The control voltage also
causes the frequency of the present
circuit to be altered. When
the input voltage is 0 V, the frequency
is a maximum: in the
present design this is about
3.8 kHz. The level of the output
voltage is ±12–13 V.
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