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Game feeder controller – Circuit Schematic
Game feeder controller
The circuit is built around an LM339 quad comparator, Ul, which forms the basis of a Schmitt trigger, timer circuit, and a window comparator. One comparator wit...
Model rocket launcher – Circuit Schematic
Model rocket launcher
The circuit consists of the launch timer itself and an automatic-off timer. When power is applied to that IC, the countdown LED's sequence is on until they are ...
Time delay circuit (555) – Circuit Schematic
Time delay circuit (555)
A very regular configuration of the 555 astable timer to work as a timer to trigger an alarm or any other equipment connected to pin 3. R resistor should be rep...
Delay Switch – Circuit Schematic
Delay Switch
This switch allows the model train at such a station will automatically slow down. The train stands for a certain amount of time and then slowly pulls back. You...
Delay switching for power amplifiers – Circuit Schematic
Delay switching for power amplifiers
This delay can be used in power amplifiers, to prevent the fuses fail when the amplifier is turned on. The circuit is very simple with a relay which turned on ...
Clock timer with LEDs – Circuit Schematic
Clock timer with LEDs
This is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. 12 LEDs can be arranged in a circle to represent the 12 hour...
18 LED sequencer timer – Circuit Schematic
18 LED sequencer timer
The question sometimes comes up of how to cascade 4017 decade counters for more than 10 sequencial stages. The LED sequencer below shows a possible solution usi...
Delay circuit with LM339 – Circuit Schematic
Delay circuit with LM339
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...
Power Off Delay Relay circuits – Circuit Schematic
Power Off Delay Relay circuits
The two circuits below illustrate opening a relay contact a short time after the ignition or ligh switch is turned off. The capacitor is charged and the relay i...
Digital Countdown schematic with 555 – Circuit Schematic
Digital Countdown schematic with 555
This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When the switch is closed, the CD4010 up/down counter is preset to 9 and th...
Long delay schematic with CD4040 – Circuit Schematic
Long delay schematic with CD4040
Generating long delays of several hours can be accomplished by using a low frequency oscillator and a binary counter as shown below. A single Schmitt Trigger in...
60 seconds timer with LEDs – Circuit Schematic
60 seconds timer with LEDs
The circuit is a 0-60 second timer using timer 555 and two 4017 for LED driving....
AC time delay circuit with 555 – Circuit Schematic
AC time delay circuit with 555
Described timer to participate in the current circuit switch - bulb without any modification of existing pipelines. Connect the timer is in Figure 1 The time s...
Delay circuit for a long time periods ( 4060 ) – Circuit Schematic
Delay circuit for a long time periods ( 4060 )
If you need a timer circuit, we go after the most proven 555th However, if the delays are longer, based on timing capacitor capacity is too large. In this case,...
Disco Smoke controller – Circuit Schematic
Disco Smoke controller
When the power is connected to the circuit by turning on SW2, RELAY1 get energized for the time it get for it to load C3 through R1 and R3. After that the relay...
Mains variable Delay circuit – Circuit Schematic
Mains variable Delay circuit
The circuit shown will switch on and off a resistive or inductive load up to 800VA with the possibility to adjust both the on and off period. Switching takes pl...
Delayed start for mains equipment – Circuit Schematic
Delayed start for mains equipment
The schematic requires few components, because the timer function has been incorporated by Nutchip. For once, from the start, made up of contacts of the relay R...
Delayed Power supply schematic – Circuit Schematic
Delayed Power supply schematic
I had designed up an oscillator with a Power Output circuit. Problem was when power was applied to the entire circuit, the output of the Oscillator gave a Momen...
Timer circuit – Circuit Schematic
Timer circuit
A wide rage auto turn OFF timer covering 1 minute to 20 hours in three ranges with S1. As soon as power is applied to the circuit the IC1 [555] starts to oscill...
Delay switching for Loudspeaker – Circuit Schematic
Delay switching for Loudspeaker
The supply of circuit becomes from a AC line in the J1. This voltage can be from a separate transformer 2X12V (the prices of materials that I give it is for 2X1...