Monday, April 15, 2019

Circuit Schematic Mains Power Failure Alert Based on CMOS IC CD4060BE

Eltronicschool. - One purpose of main failure alert circuit designed is to protect a stock and equipment from damage. This device will give you information from the alerting when something problem and protect the electricity fail.

Although there are many main power power sold in the market but you also can make it easily using simple electronic circuit like in Figure 1 below. You only using main component CMOS IC CD4060BE to build this circuit. 

Circuit Schematic

Figure 1. Circuit Schematic Mains Power Failure Alert Based on CMOS IC CD4060BE (Source:

Component Part
  1. CD4060BE CMOS IC
  2. Resistors
  3. Capacitors
  4. Photocoupler PC817B (OC1)
  5. Zener Diode
  6. LED

Circuit schematic like shown in Figure 1 above is Circuit Schematic Mains Power Failure Alert Based on CMOS IC CD4060BE. Accordingly of Electroschematics site describe that the core component of the design given here is one revered 14-stage ripple-carry binary counter/divider and oscillator CMOS IC — CD4060BE (IC1). As shown in the schematic, components R3 and C2 set the clock frequency of IC1 close to 10 Hz, and there’s a blue indicator (LED1) to show the clock activity. The Q4 output (Pin 7) of IC1 drives an active piezo-buzzer (PZB1) and a red indicator (LED2) through a small NPN transistor S8050 (T1). The circuit also includes a standard, on-rechargeable, 6F22 9-V battery (BAT) in power supply and a low-voltage slide switch (S1) as the master power on/off switch.

Image Courtesy of

The front end of the design is a simple AC230V mains presence sensor built around one popular photocoupler PC817B (OC1). The output of OC1 is routed to the “master-reset” terminal (Pin 12) of IC1 to disable its clock operation when the AC mains supply is available (standby mode). There are so many ways to convert an AC voltage into a DC voltage required by a photocoupler, and traditionally, this has been done with a step-down transformer. However, a low-cost alternative — capacitive power supply — is employed here because it’s more cost-effective and significantly smaller. In the AC mains presence sensor, a 100-n/250-V AC capacitor (C5) is the key element, and the 100-Ω resistor (R3) is to limit inrush current. The remaining components include a rectifier (D2), buffer (C4), and a protector (ZD1). The 5.1-V Zener diode (ZD1) is added intentionally to deter the blowup of C4 in case of an open-load condition at the output of the capacitive power supply (all resistors are ¼-W type).

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