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Power-Off Time Delay Relay circuit – Circuit Schematic
Power-Off Time Delay Relay circuit
The two circuits illustrate opening a relay contact a short time after the ignition or ligh switch is turned off. The capacitor is charged and the relay is clos...
Power-On Time Delay Relay circuit – Circuit Schematic
Power-On Time Delay Relay circuit
Here`s a power-on time delay relay circuit that takes advantage of the emitter/base breakdown voltage of an ordinary bi-polar transistor. The reverse connected ...
Low Voltage High Current Time Delay Circuit – Circuit Schematic
Low Voltage High Current Time Delay Circuit
In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage. Approximatey 5 amps of curren...
9 Second LED Timer and Relay Circuit – Circuit Schematic
9 Second LED Timer and Relay Circuit
This circuit provides a visual 9 second delay using 10 LEDs before closing a 12 volt relay. When the reset switch is closed, the 4017 decade counter will be res...
Digital Clock with Timer and Solar Panel Regulator circuit – Circuit Schematic
Digital Clock with Timer and Solar Panel Regulator circuit
This is a combination digital clock timer and solar panel charge controller used to maintain a deep cycle battery from a solar panel. The timer output is used t...
Timer with buzzer and optocoupler circuit – Circuit Schematic
Timer with buzzer and optocoupler circuit
A small circuit that can find a lot applications of measurement time. She has the possibility us inform with sound signal from the BZ1. At the same time, exist ...
Relay Timer switch circuit – Circuit Schematic
Relay Timer switch circuit
A 100 second delayed turn ON relay RL1 switch, if plug power +12V in circuit. In Fig. 2 see a two range 6-60 second and 1-10 minute auto turn off relay timer ci...
Repeating Interval Timer circuit – Circuit Schematic
Repeating Interval Timer circuit
This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-...
Photo Timer Circuit – Circuit Schematic
Photo Timer Circuit
Time is set by potentiometer R2 which provides a range or 1 sec. To 100 seconds with timing capacitor C1 of 100uF. The output at pin 3 is normally low and the r...
Repeating Timer 6 – Circuit Schematic
Repeating Timer 6
This circuit is the opposite of Repeating Timer No.5. It will only begin to operate if the temperature falls below the preset level. Again - the variable resist...
Repeating Timer 5 – Circuit Schematic
Repeating Timer 5
This timer circuit will only run when the temperature rises above a preset level. There`s an alternative version - Repeating Timer No. 6 - that only works while...
Repeating Timer 4 – Circuit Schematic
Repeating Timer 4
This circuit is the opposite of Repeating Timer No.3. Its operation can be limited to the hours of darkness. Again - the variable resistor (preset) lets you cho...
A Regularly Repeating Interval Timer circuit – Circuit Schematic
A Regularly Repeating Interval Timer circuit
This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-...
Two Cmos Based 24-Hour Timers circuit – Circuit Schematic
Two Cmos Based 24-Hour Timers circuit
A pair of multi-range timers offering periods of up to 24 hours and beyond. Both are essentially the same. The main difference is, that when the time runs out, ...
Cmos 4017 Sequential Timer circuit – Circuit Schematic
Cmos 4017 Sequential Timer circuit
This timer will provide a sequence of up to ten separate events. The length of each event is set independently. And the sequence will run a fixed number of time...
Car Headlights Timer Circuit – Circuit Schematic
Car Headlights Timer Circuit
This device is a simple timer, allowing to keep on the headlights of your vehicle for about 1min. and 30sec. , e. g. when accessing some dark place, without the...
DC Protection Time Delay for Loudspeaker circuit – Circuit Schematic
DC Protection Time Delay for Loudspeaker circuit
The particular circuit combines enough operations, as Smooth departure of benefit of AC line of network, with delay 1sec, to the transformers of power supply of...
A muting delay & DC offset protection circuit – Circuit Schematic
A muting delay & DC offset protection circuit
A low pass filter is merely a stable state-space system that has an input and spits out an output. If the input is a quasi-periodic signal, then the output woul...
5 Minute Digital Clock – Circuit Schematic
5 Minute Digital Clock
The clock shows time in 5 minute intervals. The hour and minute can be set. There is no alarm or any AM/PM indicator. For the clock face I used a 2 pieces of le...
Headlights Timer – Circuit Schematic
Headlights Timer
This device is a simple timer, allowing to keep on the headlights of your vehicle for about 1min. and 30sec. , e. g. when accessing some dark place, without the...