Auto Power off Circuit Diagram

Introduction

An Auto Power off Circuit is a handy addition to any electronic device as it serves to conserve energy and protect the unit itself. By cutting power when devices are not in use, users prevent their devices from overheating or other risks associated with poor power management. The circuit typically works by setting a timer which either gradually reduces energy supplied to the device, or completely shuts it off after a certain period of time. This ensures that unnecessary energy isn’t consumed while protecting any components from damage. Auto power-off circuits also provide a level of convenience since if users forget to shut down their device manually, the timer will do it for them.

Circuit Diagram

of Auto Power off Circuit

More Circuit Layouts

**LA4440 Amplifier, Tone Control & MP3**

Bass Tone Control Circuit Diagram — **LA4440 Amplifier, Tone Control & MP3**

**Variable Power Supply 0-30V_10A Circuit Diagram**

Stereo Amplifier TDA7297 Dual-Bridge Circuit Diagram — **Variable Power Supply 0-30V_10A Circuit Diagram**

List of Components of Auto Power Off Circuit

BC516 Transistor x 1
100uf Capacitor x 2
270 Ohms Resister x 2
100 Ohms Resister x 1
9 Volts Power Supply

Working Explanation

of Auto Power off Circuit

Designers and Manufacturers lean over backward to ensure that their equipment attracts a small modern and may therefore be operated by a battery.

This has a drawback, however, because even if the equipment in question draws only a small current, when it is not switched off, the battery is flat after a few days or weeks. The circuit presented here can prevent this from happening.

It may be delivered to all styles of systems running from a nine v battery and switches this off routinely one minute after a preset time has elapsed. The 20mA is the peak switching current and it is quite enough for most of the applications.

The switch is made by a PNP Darlington (BC516) T1‚ which is actuated by the S1 switch push button. The very high amplification of the Darlington enables it to be kept on fairly long with the aid of a relatively small value capacitor, C1 (= 100 µF). Resistor R3 limits the charging current of C1‚ to ensure a long life of S1.

Resistors R1 and R2, together with C1, decide the switch-on time. When this time has elapsed, R1‚ensures that T1 is switched off.

Since Darlington can handle a UBE of -10 V, a polarity protection diode is not needed.

More Circuits, You May Like:

Conclusion

When it comes to convenience and energy savings, nothing beats an auto power-off circuit. This type of circuit is designed to turn off a device automatically when it's not in use, thereby cutting down on the electricity consumption of the device. It can also be used to conserve both time and money since it eliminates the need for manual shutoff. Moreover, these circuits are relatively simple to install, meaning they don't require any special tools or expertise to set up. Overall, an auto power-off circuit is a great way to optimize your electronics' efficiency while making life simpler and more convenient at the same time.