02_20000_Hz_VOLTAGE_CONTROLLED_RAMP

Published:2009/7/13 6:11:00 Author:May | From:SeekIC

With values shown, frequency of ramp can be varied over range of about 20 kHz by changing DC input voltage. Lowest frequency is set by R1. Adjust R2 to make average output 0V, and set desired output level with R3. Uses 555 IC timer as astable MVBR, with charge current being supplied by transistor. Voltage/frequency relationship is logarithmic, making oscillator suitable for use in sound synthesizers.-J. L. Brice, Voltage-Controlled Ramp Generator, Wireless World, June 1976, p 72.



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