Circuit Schematic Power Supply Resumption Alarm using 555 IC

Power Supply. - This is electronic electronic circuit of power supply resumption alarm using NE555 IC like in Figure 1 below. In this circuit schematic the basic component used are 555 IC and relay. 

In here we will give you global description about Power Supply Resumption Alarm using 555 IC and then we will give you link to continue your reading from original source as external website.

Circuit Schematic

Figure 1. Circuit Schematic Power Supply Resumption Alarm using 555 IC (Source: Electronicsproject.org)

Component Part

• R1, R2 = 10 KΩ
• R3 = 470 Ω
• VR1 = 1 MΩ (DELAY ADJ.)
• C1 = 1000 µF/25V
• C2 = 100 µF/25V
• C3 = 1 µF/25V
• C4 = 0.01 µF
• IC1 = NE555
• T1 = SL100
• D1 – D3 = 1N4001
• X1 = 12V – 0 – 12V 500 mA secondary
• F1 = Fuse
• RL1 = 12V, 400Ω relay
• 230V buzzer

Description

Circuit schematic like in Figure 1 above is Circuit Schematic Power Supply Resumption Alarm using 555 IC. Electroschematics site describe that here is an audio annunciator which can be useful in factories, industries, auditoriums, and theatres etc where generator is used when power fails. It produces an alarm for a predetermined time when power resumes.

The circuit is built around IC555 wired in monistable mode. The surge when power resumes triggers the monostable which switches transistor SL100 on. The relay energized and the bell or buzzer connected to N/O contacts of the relay operates. The preset time depends upon VR1 and C2. The Capacitor C3 connected to pin 2 of 555 should have low leakage.

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