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Defrost Timer – Circuit Schematic
Defrost Timer
I am always being asked where the defrost timer is located on a refrigerator. Unfortunately the location varies depending on the manufacturer and model. Some a...
The Time Delay Circuit – Circuit Schematic
The Time Delay Circuit
The length of time the circuit stays on for depends on how long it takes for the stored electrical current to leak back into the circuit, keeping the transistor...
Circuit to trigger on pulse and let current pass for x seconds – Circuit Schematic
Circuit to trigger on pulse and let current pass for x seconds
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Relay Timer with ATmega8 AVR MCU – Circuit Schematic
Relay Timer with ATmega8 AVR MCU
A simple timer that can be used to turn on/off a load after user specified time. The prototype was developed using xBoard MINI, a low cost easy to use ATmega8 d...
Signal Delay – Circuit Schematic
Signal Delay
For many applications it is necessary to delay signals. Just think of applications in automation and control systems. Such a signal delay circuit can be set up ...
Time Delay Relay Schematic – Circuit Schematic
Time Delay Relay Schematic
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The Universal Timer with description – Circuit Schematic
The Universal Timer with description
Universal Timer is a most versatile timer project wide range of 1/10th second to 100s hour time period circuit diagram with description of universal timer vario...
Programmable timer for appliance – Circuit Schematic
Programmable timer for appliance
Programmable timer for appliance circuit is advanced timer appliance is controlled by timer circuit from 8 sec. to 2 hour.circuit diagram of programmable timer ...
Off timer with alarm with description – Circuit Schematic
Off timer with alarm with description
Off timer with alarm is a simple project used to indicate time off employs 4 transistor,.circuit diagram with parts list and description of off timer with alarm...
Advanced appliance timer – Circuit Schematic
Advanced appliance timer
This project introduces important type of transducer, an optical coupler. An optical coupler together with a square wave generator and counters can be used to c...
Adjustable 1-10 Minute Timer Project – Circuit Schematic
Adjustable 1-10 Minute Timer Project
The circuit starts timing when switched on. The green LED lights to show that timing is in progress. When the time period is over the green LED turns off, the r...
switches Can I achieve a one shot button without a 555 – Circuit Schematic
switches Can I achieve a one shot button without a 555
A relay, which is energised by pulling the low side low using an NPN. I would like a pushbutton to operate the transistor (and therefore the relay) for a time (...
transistors Random-delay gen – Circuit Schematic
transistors Random-delay gen
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low power simple energy efficient circuit to make single IR LED blink – Circuit Schematic
low power simple energy efficient circuit to make single IR LED blink
Powering the LED with a 3V CR2032 battery and hoping I could extend the battery life by making the LED blink instead of having it on all the time. The 555 timer...
555 How can I make a 15 minute egg timer circuit – Circuit Schematic
555 How can I make a 15 minute egg timer circuit
To do this, I want to push a button to initiate the timer, which will then light 3 x leds. After each 5 minute segment is up, one of the LEDs should go out. Fin...
Trigger delay debugging – Circuit Schematic
Trigger delay debugging
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Amplifier Timer – Circuit Schematic
Amplifier Timer
This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device ...
Timer Thermostat Circuit – Circuit Schematic
Timer Thermostat Circuit
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Bathroom Water Heater Timer – Circuit Schematic
Bathroom Water Heater Timer
Electronic switch ES1 connects the frequency determining capacitor to the input of clock oscillator N1. The logic level that exists at the Dm terminal of IC; is...
555 Timer To Control Motors – Circuit Schematic
555 Timer To Control Motors
I am a mechanical engineering student, and for a part of my design project I wish to use a timer as so the motor switches off about 40-50 seconds after activati...