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
Related Links
More circuit about LM555 Timer
More circuit about Timer Controller
Relay Timer switch By IC 555 and 741
Basic timer control with NE555
LM8560 Digital Clock 24 Hr with alarm
Delay to supply voltage for surge protector by scr
This entry was posted on Tuesday, September 8th, 2009 at 9:03 am and is filed under 555, Timer.
