Touch Switch Circuit


Posted on Jan 11, 2013

When the touch-on contacts are bridged, pin 6 of Ul-b goes low, which forces its output (the set output) at pin 4 to go high. That high divides along two paths; in one path, the output is applied to pin 2 of Ul-a, which causes its output at pin 3 to go low. That low is, in turn, applied to pin 5 of Ul-b, which latches the gate in a high output state. In the other path, the output of Ul-b is used to drive Ql. When Ql turns on, U2`s internal LED lights, which turns on its internal, light-sensitive, triac-driver (diac) output element.


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

The triac driver feeds gate current to TR1, causing it to turn on, and light the lamp (11). When the off contact is bridged, IJl-a`s output switches and latches high, causing Ul-b`s output to go low, turning off the lamp.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

PC 8Way Relay Board
Data separator
High-pressure direct current power supply scheme of the new low ripple
The figure based on LM3S101 adopts the controller to design
tda2003 10 watts audio amplifier circuit design electronic project
Si3210 Si3211 Si3212 Hardware Reference Guide
The local oscillator for 10.7 to 2.5MHz conversion
And put the intermodal server preamplifier circuit diagram
Touch the socket circuit diagram



Top