1850_Hz_DIGITAL_IC

Published:2009/7/6 0:46:00 Author:May | From:SeekIC

Two sections of RS7404 hex inverter are connected as astable MVBR operating at frequency determined by values used for C1 and C2. Output drives loudspeaker as shown to produce audible tones or can be connected to flash LEDs. D1 reduces battery voltage to 5 V required by 1C. Developed for classroom demonstrations. Circuit produces nearly square waves with amplitude of about 3 V and pulse width of about μ100 pos if used as squarewave generator.-F. M. Mims, Integrated Circuit Projects, Vol. 6. Radio Shack. Fort Worth. TX, 1977, p 64-69.



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