VARIABLE_WIDTH_TO_1285_MHz

Published:2009/7/15 22:02:00 Author:Jessie | From:SeekIC

Single IC circuit uses two monostables to form pulse generator that covers over eight decades (0.054 Hz to 12.85 MHz) with only eight capacitors. Similarly, only eight capacitors cover pulse width range of over eight decades (60 ns to 18 s). Voltage control of frequency and pulse width can be obtained by connecting R2 and R4 to individual 1.5-4.5 V control voltage lines instead of to VCC. Frequency will then vary almost linearly with control voltage, while pulse width will vary almost inversely with control voltage. Capacitor values range from 1 pF to over 100 μF. -M. J. Shah, Wide-Range Pulse Generator Uses Single IC, EDN Magazine, Jan. 5, 1973, p 107 and 109.



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