Position: Index > 555 Circuit >

WATER ACTIVATED ALARM USING IC 555 CIRCUIT SCHEMATIC DIAGRAM

2016-05-03 12:32  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.

  WATER ACTIVATED ALARM USING IC 555 CIRCUIT SCHEMATIC DIAGRAM

Probe/contacts may use a non-reactive metal. Gold or silver plated contacts from an old relay May be Used, however a cheap alternative is to wire alternate copper strips from a piece of veroboard. These will eventually oxidize over but as very little current is flowing in the base circuit, the higher impedance the caused by oxidization is not Important. No base resistor is Necessary as the transistor is in emitter follower, current limit being the impedance at the emitter (the oscillator circuit).