Touch triggered bistable


Posted on Sep 28, 2012

This circuit uses a 555 timer in the bistable mode. Touching T2 causes the output to go high; D2 conducts and D1 extinguishes. Touching T1 causes the output to go low; D1 conducts and D2 is cut off. The output from pin 3 can also be used to operate other circuits ( a triac controlled lamp). In this case, the LEDs are useful for finding the touch terminals in the dark


Touch triggered bistable
Click here to download the full size of the above Circuit.

Cl is not absolutely necessary but helps to prevent triggering from spurious pulses.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Logic test probe with memory
Audio Mixer
LED Drivers/LCD Bias
Tachometer circuit
divide 1 333 multiply circuit
5A Lab Power Supply With Digital Readout
Interface Bluetooth with LPC2148 circuit
Colorful lights loop circuit
Relative humidity digitizer circuit diagram
A multi-purpose radio talk lamp circuit
DW16M-630 type DC excitation switch control circuit



Top