All components arranged as in the picture sequence below. Current will flow starting from the source voltage and to the switch. When the switch is closed current will flow through the diode, where diode serves as a switch is closed because it was given forward bias (anode diode is given positive voltage and the cathode is given a negative voltage).
 |
2 Tones Doorbel Schematic with IC555 |
Flows will be divided into two to D1 and D2. Flows from D1 (diode 1) will be channeled towards R3 and proceed toward IC555 pin7 and pin 6. Pin 7 (Discharge) serves as an audible tone interval timing, and pin 6 (threshold) to determine the final timing tone, flow at D2 will be divided into three, heading polar capacitors, resistors, and IC555 pin 4. Polar capacitors are capacitors that have poles. The current through the capacitor and R1 polar probe + will go to the speakers. IC555 pin 4 is reset, as the timing interval can be interrupted by giving the reset pulse 0V. IC555 pin 4 is connected to the speaker probe +. Speaker probe - will be connected with C3 (capacitor 3) and grounded out, and the probe - the speakers will be connected with the source voltage -.
The working principle of the Bel 2 tone in which the DC voltage source is given in the IC555 serves as a timer tones, and used the switch that serves as a voter tone high (when the switch is turned ON) and low tone (when the switch position OFF).
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