In many homes and industries sometimes a fan does not turn ON immediately. A fan start delay timer is a circuit that delays the fan start. When power is applied the fan stays OFF and after some fixed time the fan turns ON automatically. In this circuit the delay time is about 10 seconds and […]
Timer Circuits
30 Minute Delay Timer Circuit using Transistors
This article explains a simple 30 Minute Delay Timer Circuit using Transistors. The circuit is with low cost and is easy to build. It uses common parts like BC547 transistors, resistor and capacitor. Because of simple design, beginners can also understand it easily. This circuit is useful where delayed switching is required. For example, light […]
Simple PIR Sensor Timer Circuit using Transistors
Here, is a article for a Simple PIR Sensor Timer Circuit using Transistors. It is with low cost and easy to build and it works with 12V DC supply. When motion is detected the output stays ON for some time. After delay the output turns OFF automatically. Hence, this circuit is useful for lights, alarms […]
5 To 20 Minutes Alarm Timer Circuit
Time control is very important in out daily life. Sometimes we do forget small tasks. So this 5 To 20 Minutes Alarm Timer Circuit helps us remember. It gives alarm after a fixed time as the circuit uses popular IC 555 timer. Time can be selected from 5 to 20 minutes by just pressing start […]
Audio Sound Generator Circuit using IC 555
Want a simple sound maker? then make noise with this electronic circuit. This small circuit makes loud beep sound from speaker using only one 555 timer. The circuit turns 9V battery into instant audio tone. This Audio Sound Generator Circuit using IC 555 is easy to build and is great for learning. Circuit Working: Parts […]
555 Pulse Generator Li-ion Battery Charger Circuit
Charging a Li-ion battery does not need big smart charger. But we can do it with one small 555 timer chip. This 555 Pulse Generator Li-ion Battery Charger Circuit makes fast little pulses that charge the cell gentle and safe. Anyone can build this circuit with very few parts and with very low cost. A […]