How to make power supply failure alarm

If you want to make alarm alert like UPS do. when electricity of UPS will be shouting louder which that announce/remain us that electricity is off. Following this circuit will guide you how to make...

Dark Activated Led Or Lamp Flasher Electronic Circuit Diagram

Parts:
R1_________________Photo resistor (any type)
R2________________100K 1/2W Trimmer Cermet
R3,R4______________10K 1/4W Resistors
R5________________470R 1/4W Resistor
...

The Relay Sub Board Electronic Circuit Diagram

Attach this board to the Simplified I/O Interface Board
Use nine pieces of hookup wire (or a piece of ribbon cable) to connect corresponding points on the I/O Demonstratio...

Stepper Motor Controller Electronic Circuit Diagram

Stepper motor gives a simple, low cost, and accurate position control. Stepper motor can be driven by circuit mounted close to the motor, and controlled by a remote control circuit through long cable....

Time Delay Relay Electronic Circuit Diagram

A time delay relay is a relay that stays on for a certain amount of time once activated. This time delay relay is made up of a simple adjustable timer circuit which controls the actual relay. The t...

Simple Dc Motor Pwm Speed Control Electronic Circuit Diagram

Circuit Explaination:

The 555 Ic is wired as an astable and the frequency is constant and independent of the duty cycle, as the total resistance (R charge R discharge, notice the diode) i...

8 Channel Software Controlled Fanbus With Pwm Electronic Circuit Diagram

This article is about a software controlled, parallel port-interfacing 8-channel Pulse-Width-Modulated fan controller.

This article was previously published at http://www.hardware-testdk.co...

Dual Relay Driver Board Electronic Circuit Diagram

Dual Channel Relay Board is a simple and convenient way to interface 2 relays for switching application in your project.

* Input - 12 VDC @ 84 mA
* Output - two SPDT relay
* Relay...

Fan control Electronic Circuit Diagram

R1 15k ohm resistor NTC Thermistor- 10k ohm, sold at Radio Shack in the states. P1 10k ohm potentiometer - sets the low speed(voltage) of the fans at the cool temperature. P2 50K ohm potentiometer ...

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