@▷ Telephone Ring Schematic using Dual Timer 555 | Diagram for Schematic

Telephone Ring Schematic using Dual Timer 555

This circuit serves as an additional ringtone for your telephone. THis circuit uses two IC timer 555 and some transistors to produce the ring. When someone calls, then the IC 555 will be active and start to produce signal which then will be forwarded by another 555 IC so that it can produce the sound. This circuit uses one 6V power supply and equipped by an ON/OFF switch. Here is the schematic :

Telephone Ring Schematic using Dual Timer 555

Components list :
Diode D1 : 1N4001
Resistor R1,R15 : 10k ohm
Resistor R2 : 92k ohm
Resistor R3 : 1k ohm
Resistor R4-R6 : 68k ohm
Resistor R7,R9,R16 : 15k ohm
Resistor R8 : 12k ohm
Resistor R10-R12 : 6.8k ohm
Resistor R13 : 33k ohm
Resistor R14 : 220 ohm
Resistor R17 : 10 ohm
VR1 : 47k ohm
Polar capacitor C1,C3 : 22uF/16V
Capacitor C2, C4, C6, C8 : 0.01 uF
Polar capacitor C5 : 4.7uF/16V
Capacitor C7 : 0.047 uF
Polar capacitor C9 : 0.47 uF/16V
Transistor T1-T4 : BC547
IC1-IC2 : NE556
LS : Speaker 8W/4 ohm
S1 : ON/OFF Switch

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