900_kHz_TO_10_MHz

Published:2009/7/15 4:41:00 Author:Jessie | From:SeekIC

Pulse width is variable from about 50 ns to over 500 ms by adjusting only two components. Uses VCO portion of Signetics NE562 as pulse generator and 74121 mono MVBR to ad just pulse width. Variable capacitors C3 and C6 are broadcast-band type. VCO will operate to 30 MHz, limiting factor being stray capacitance and minimum of tuning capacitor. Low-frequency limit of VCO is about 1 Hz, obtained when C3 is 300 μF.-A. Plavcan, Pulses Galore! , 73 Magazine, Jan. 1978, p 194-195.



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