In today’s electronic equipment is widely used touch control. Option sensor available for beginners repetition hams, offers Czech magazine “Amaterske Radio”. If you touch the plate, induced in the human body room electrical AC voltage increases two-stage ULF transistors V1, V2, and then straightens diode VЗ. Direct voltage of about 4 V, which appears at the sensor output, is the command signal.
The device used any low-power silicon transistors, for example, КТ342, KT315 with any alphabetic index. Diode any silicon (Д220, Д219). Capacitor — KBG-And or BMT. Touch plate — cut foil fiberglass with a size of 20X20 mm.
Recommend to read
AND THE STUMP WILL COME IN HANDY
The stump on the dacha is usually not only a hindrance but also a problem: to root out its not so easy. However, you can not get rid of it, but rather made to serve. For example, using...
A FUNCTION GENERATOR
I want to share my version of the functional generator frequency sweep for the home lab. Consuming from the electrical power source 50 mA, is a compact, fairly simple to manufacture, the...
