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Relay Circuits

2 Lead Solid State Breaker Resets Itself: 03/30/95 EDN-Design Ideas / Simple dc circuit breaker can protect a power supply from the ever-present screwdriver or even isolate a satellites dual power system from a short circuit in one subsystem

555 Timer MonoStable Circuit using Pushbutton:

741 Based Light Sensor:  CdS photocell used for light/dark controlled relay

9 Second LED Relay Timer:

Alternating On / Off Control:

Analog switch lowers relay power consumption: 12/20/2001 EDN - Design Ideas / Designers often use relays as electrically controlled switches. Unlike transistors, their switch contacts are electrically isolated from the control input. However, the power dissipation in a relay coil may render the device unattractive in battery-powered applications. You can lower this dissipation by adding an analog switch that allows the relay to operate at a lower voltage (Figure 1). .

CMOS Toggle Flip Flop With Relay(CD4013):

Control 120 Volt AC Relay With TTL:

Controlling Relays With Logic Voltages:

Countdown timer With Relay:

Dark / Light Activated Relay:

Electronic Relay: medium power complementary transistor pai will switch on and off a load up to3A12V

Electronic Thermostat Relay Circuit:

Flip Flop Flashers, Buzzers, Etc.:

KD2BD Video Operated Relay : turns on relay if there is video signal present in the input

Key Reading Circuit saves I/O Pins: 03/05/03 EDN-Design Ideas  /  PDF contains multiple circuits - scroll to find this circuit

Latching Relay Driver:

Light / Dark Detector:

Load Sensing Automatic Switch: apply power to the entire audio system by turning on1-item, simple circuit

Modular Relay System:

Programmable Light Activated Relay:

Relay Circuits use Reverse hysteresis: 05/08/97 EDN-Design Ideas

Relay Delay Circuit:

Remote Control turns Battery On & Off: 09/12/97 EDN-Design Ideas

SCR Phase Control yields Solid State Switch: 03/15/01 EDN-Design Ideas / PDF contains multiple circuits - scroll to find the one of interest / SCRs (silicon-controlled rectifiers), or thyristors, have higher current and voltage ratings, lower conduction losses, and more robustness than triacs. For these reasons, SCRs are better suited to high-power applications. This is high power dimmer circuit for115V AC.

Simple Circuit Drives Latching Relays: 02/01/96 EDN-Design Ideas

Simple Solenoid Driver Reduces Power & Cost: 07/18/96 EDN-Design Ideas

Solenoid Starter:

Solid State Relay Saves Battery's Life: 09/01/94 EDN-Design Ideas

Switch Intelligently Controls Current: 03/30/00 EDN-Design Ideas / This circuit can intelligently control ac or dc current when connected in series with a load

Time delay relay reduces inrush current: 03/07/2002  EDN - Design Ideas / A transformer switching onto a line can sometimes cause a circuit breaker to trip or a fuse to blow. This phenomenon occurs even if the transformer presents no load, such as when the secondary is open. The problem arises because of the heavy magnetizing inrush current in the transformer. The amplitude of the current depends on the instant on the ac waveform at which the transformer become... .

Time Delay Relay:

Transformer Driver Controls BiDirectional Switch: 07/17/97 EDN-Design Ideas / You can use a transformer-driver IC to simply control a MOSFET on/off switch

Transistor Relay Driver:

Two Lead Solid State Breaker Resets itself: 03/30/95 EDN-Design Ideas / Simple dc circuit breaker can protect a power supply from the ever-present screwdriver or even isolate a satellites dual power system from a short circuit in one subsystem

Video Activated Relay:

Water Activated Relay:

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