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Sleep Mode Circuit Circuit – Circuit Schematic
Sleep Mode Circuit Circuit
The HA7210 oscillator 10 combines with an IOL7642 quad CMOS op amp to produce a sleep-mode control circuit. The circuit is put into the sleep mode with a logic...
Time Delay Relay Circuit – Circuit Schematic
Time Delay Relay Circuit
Using a 4060 CMOS binary divider and built-in clock oscillator, a long-duration timer can be made veiy simply. The solid-state relay can be sized for your appl...
Timed Safety Circuit Circuit – Circuit Schematic
Timed Safety Circuit Circuit
When SI is closed, pin 9 of Ul goes low, turning on Ql for a preset period. If S2 is closed during this period, Q2 is turned on for a preset period....
Safety Circuit Circuit – Circuit Schematic
Safety Circuit Circuit
Because of the finite hold-on time of delay circuits Rl/Cl and R2/C2, both SI and S2 must be pressed at the same time...
Darkroom Timer Circuit – Circuit Schematic
Darkroom Timer Circuit
The electronic darkroom timer is built around a 555 oscillator/timer, a pair of general-purpose transistors, a buzzer, and an LED. The 555 (Ul) is configured a...
Time Delay Flash Trigger Circuit Circuit – Circuit Schematic
Time Delay Flash Trigger Circuit Circuit
The circuit is built around a single 4093 quad 2-input NAND Schmitt trigger....
Amplifier Cool-Down Circuit Circuit – Circuit Schematic
Amplifier Cool-Down Circuit Circuit
This cool-down relay circuit uses an IC timer to drive a relay, which keeps the blower on for a time delay from timer U3. ...
Furnace Fuel Miser Circuit – Circuit Schematic
Furnace Fuel Miser Circuit
A timer (LM555CN) and decode counter is used to generate duty cycles from 10% to 100% to control the time a heating system can operate. V2 is a decode counter ...
Battery Saver Circuit Circuit – Circuit Schematic
Battery Saver Circuit Circuit
This battery saver circuit can automatically turn off a small piece of test equipment after a desired period of time, allowing you to leave your shop worry fre...
Long-Duration Time Delay – Circuit Schematic
Long-Duration Time Delay
Transistor Ql and resistors Rl, R2, and R3 form a constant current source and the charge current might be adjusted...
Adjustable Timer – Circuit Schematic
Adjustable Timer
LEDs indicate at a glance what the status of the circuit is at any given moment. Once the reset switch, SI, makes contact,...
Watchdog Timer/Alarm – Circuit Schematic
Watchdog Timer/Alarm
The watchdog timer contains a counter, IC3, in addition to the usual retriggerable 555 timer, ICl. The counter will so...
Appliance Cutoff Timer – Circuit Schematic
Appliance Cutoff Timer
Suitable for cutting off an appliance or other ac load, this timer will cut the ac power after a period determined b...
Programmable Timer For Long Intervals – Circuit Schematic
Programmable Timer For Long Intervals
By using an RC oscillator and a programmable divider, this counter can run for hours. An interval osc...
Long-Interval Programmable Timer – Circuit Schematic
Long-Interval Programmable Timer
Using an RC oscillator, an up to 24-stage ripple counter O) 16777216 or 2U, and a 0.1-Hz count-rate with #...
Mains-Powered Timer – Circuit Schematic
Mains-Powered Timer
This timer can be inserted in a power line to provide a controllable delay before a load is energized. The mains voltag...
Time-Delay Photo-Flash Trigger – Circuit Schematic
Time-Delay Photo-Flash Trigger
Ql is a phototransistor that is normally illuminated by a beam of light. When the beam is intercoupled, pin ...
Photo-Event Timer – Circuit Schematic
Photo-Event Timer
S2 is used to initiate timing. A light-to-dark or dark-to-light transition stops this timer, depending on the setting of ...
Sequential Flasher – Circuit Schematic
Sequential Flasher
Using a 555 timer to drive a CMOS counter, this device uses RCA CA3079 zero-voltage switch to control triacs TR1 through...
Interior Convenience Light – Circuit Schematic
Interior Convenience Light
When the door is closed, this circuit keeps the dome light on for a period determined by Rl/Cl. The time is appr...