Time-delayed relay
This simple timing circuit can delay an output switching function from 1 seconds to about 1 minute...
Sequential timer
By utilizing both halves of a dual timer it is possible to obtain sequential timing. By connecting the output of the first half to the input of the second half ...
Thumbwheel programmable interval timer
Switch programmable on/off or interval timer, has three relay-switched outputs. Output one is active for the duration of time 1, output two is active for the du...
Tarry light
The push button and potentiometer initiate a time delay that turns a light on then automatically turns it off again after a predetermined time. The potentiomete...
Darkroom timer
The darkroom timer/controller uses few external components: a display, a digit driver, keyboard, and output switching devices. A 4-digit common-cathode LED disp...
Ultra-precise long time delay relay
Predictable time delays from as low as 0 milliseconds to over 3 minutes are obtainable without resorting to a large value electrolytic-type timing capacitor...
Long delay timer using put
The PUT is used as both a timing element and sampling oscillator...
Door chimes delay
With values shown, this simple circuit will permit one operation every 10 seconds or so. Capacitor C1 charges through Rl when the button is released...
Long time delay
In the 556 timer, the timing is a function of the charging rate of the external capacitor. For long time delays, expensive capacitors with extremely low leakage...
Universal wiper delay
ICl is connected in the astable mode, driving RLA, C3, Dl, and D2 prevent spikes from the relay coil and the wiper motor from triggering ICl. VR2 is adjusted to...
Precision time-countdown timer
The circuit uses an ICM7213 precision one minute/one second timebase generator using a 4.1943 MHz crystal for generating pulses counted by an ICM7217B. The thum...
Programmable voltage controlled timer
The µA2240 may easily be configured as a programmable voltage controlled timer with a minimum number of external components. The modulation input (pin 12), w...
Long duration timer
The time circuit can provide a time delay of up to 20 minutes. The circuit is a standard relaxation oscillator with a FET current source in which resistor Rl is...
Timer circuit
After one cycle of operation, SCR 1 will be on, and a low value of voltage is applied to the UJT emitter circuit, interrupting the tuning function. When pushbut...
Timer with alarm
The circuit has two ranges: 10 sees to 5 mins and 1 min to 80 mins. It can be powered by a 9-V battery. With the LED connected as shown a reasonable frequency o...
Long-term electronic timer
The timer includes an oscillator and a counter in an integrated circuit. The timing interval equals the oscillator period multiplied by the number of cycles to ...
Integrator multiplies 555 delay
Long delay times can be derived from a 555 timer with reasonably sized capacitors if an integrator circuit is used. ...
Hour time-delay sampling circuit
The circuit lowers the effective peak current of the output PUT, Q2. By allowing the capacitor to charge with high gate voltage and periodically lowering gate v...
Relay driver
The relay operates a certain time, td, after power is applied to it, and then it operates for a length of time, tc. The SCR fires when the voltage on Ci reaches...
Timer circuit
This precision, solid state, time delay circuit has delayed off and delayed on switch-functions that are interchangeably available by simply interchanging the r...