Tuesday, September 8, 2009

Electronic Time Constant Control

These circuits show methods of changing the operating frequency of astable LM555 timers electronically. Any source that can drive the base of transistor Q1 can control these circuits. The advantage of using this type of frequency control is that the duty cycle of the timer is not affected when the frequency is changed. [...] Read more Source: http://home.cogeco.ca/~rpaisley4/LM555.html


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