water saving circuit

Circuit Principle This device is used in bathrooms to achieve water saving and hygiene purposes.
    The picture shows the circuit of this device. IC is a common music integrated block , and this device also cleverly
utilizes its memory function. SB and SA are homemade pressure-sensitive switches. When someone steps on the self-made pedal
, SB is closed, SA is opened, and the music integrated block IC is triggered. Since the external oscillation resistor of the integrated block
is disconnected, the IC has no signal output, but the IC remembers this trigger signal. When the person leaves, the pedal recovers
, SB opens, SA closes, and IC outputs a signal. The c1 smoothing filter makes the composite transistors VT1 and
VT2 conduct, the normally open contact of the relay K closes and turns on, the electromagnet or electromagnetic valve opens, and the water gate
flushes automatically. When the 1C delay ends, the circuit automatically closes the water gate.
    (2) Component selection 1C uses common music integrated blocks . VT1 uses 9013 type transistor,
VT2 uses 9011 type transistor , both require p>60; K uses JRX-13F type relay; the power supply
uses a 6V battery, or an AC regulated power supply.