Frequency and time signal generator circuit

Published:2012/8/15 22:38:00 Author:Ecco | Keyword: Frequency , time, signal, generator | From:SeekIC

The circuit uses a 7490 four asynchronous counter (including four flip-flopS ) to form two-frequency divider and five-frequency divider by an external programmer. The time-base circuit is compoaed of two NAND gates and crystal, and the divider uses 13-position switch S to choose different frequency. The output voltage has a TTL- level, which is approximately 3.8V.



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