Correction POPULAR ELECTRONICS [2] Sep 1989 (v.6#9) pg. 4
Relay debouncer circuit uses an optoisolator.
POPULAR ELECTRONICS [2] Sep 1989 (v.6#9) pg. 24
A failsafe bipolar relay driver is used to complete the relay's coil circuit after sensing a pulse-on signal from a computer, or other source.
POPULAR ELECTRONICS [2] Mar 1990 (v.7#3) pg. 104
Simple circuit is a great help in checking solenoids and relays.
POPULAR ELECTRONICS [2] Apr 1990 (v.7#4) pg. 22
Relay controller. A double-pole, double-throw relay wired for latching operation.
POPULAR ELECTRONICS [2] May 1990 (v.7#5) pg. 27
Relay actuator circuit uses just two inexpensive switches instead of a hex converter.
POPULAR ELECTRONICS [2] Mar 1991 (v.8#3) pg. 26
Simple circuit called a delay-off relay timer. A charged capacitor keeps a relay latched. This can provide an exit delay for an alarm system.
POPULAR ELECTRONICS [2] May 1991 (v.8#5) pg. 86
How to use the popular 555 timer IC in practical monostable multivibrator circuits. (1) Fixed-period timer. (2) Relay drivers. (3) Pulse generator. (4) 1-kHz linear-scale analog frequency meter.
POPULAR ELECTRONICS [2] Mar 1993 (v.10#3) pg. 53
Simple single-transistor circuits. (1) Voltage regulator outputs 6-volts DC. (2) Constant-current output. (3) Simple audio amplifier. (4) Impedance-matching circuit. (5) LED-control circuits turn either off or on in the presence of a DC voltages from 5- to 9-volts. (6) Relay-driver circuit has a latching feature that keeps the relay on once energized.
POPULAR ELECTRONICS [2] Dec 1995 (v.12#12) pg. 77
Simple diode circuits. (1) Bridge rectifier. (2) Sound-level (audio signal) limiter circuit never exceeds 1.5-volts peak-to-peak. (3) DC polarity or AC indicator circuit. (4) Kick-back voltage limiter for inductive loads. (5) Steering circuit controls relays based on voltage polarity. (6) Simple temperature sensor. (7) Circuit for selecting matching diodes.
POPULAR ELECTRONICS [2] May 1996 (v.13#5) pg. 64
Simple op-amp application circuits. (1) Fixed voltage reference. (2) Light-operated sensor. (3) Alarm sensor. (4) Voltage-level sensor. (5) Peak-voltage detector and hold. (6) DC motor driver and reverser. (7) Simple timer circuit to delay relay operation for up to 30 seconds.
POPULAR ELECTRONICS [2] Nov 1997 (v.14#11) pg. 62
Tip: An explanation of the operation of a three-pole relay.
POPULAR MECHANICS Mar 1982 (v.157#3) pg. 10
Circuit for a relay multivibrator.
RADIO-ELECTRONICS Apr 1980 (v.51#4) pg. 77
Circuits to alternately open and close a relay on sequential control pulses.
RADIO-ELECTRONICS Jul 1981 (v.52#7) pg. 62
Tip: How to avoid stray signal paths when a multiple-input circuit controls several different relays.
RADIO-ELECTRONICS May 1985 (v.56#5) pg. 102
More control circuits. Using relays as alternatives to manual switches.
RADIO-ELECTRONICS Sep 1985 (v.56#9) pg. 98
All about transistor switches. How to control motors, relays and light bulbs with digital IC's.
RADIO-ELECTRONICS Feb 1986 (v.57#2) pg. 83
Understanding relays. Part 1. Electromechanical versions.
RADIO-ELECTRONICS Nov 1989 (v.60#11) pg. 59
Understanding relays. Part 2. Solid-state versions.
RADIO-ELECTRONICS Dec 1989 (v.60#12) pg. 59
Circuit built around a 555 timer IC and a 4017 IC are used to trigger up to ten relays that in turn control AC power. The circuit shown is designed to operate a decorative traffic light (or similar device).
RADIO-ELECTRONICS Feb 1991 (v.62#2) pg. 16
Controlling an inductor (such as a relay or motor coil) using a solid-state device requires special protection techniques. Three transient (spike) suppressor circuits shown.
RADIO-ELECTRONICS Sep 1991 (v.62#9) pg. 67
Solid state relays (SSR's). Build your own repairable SSR's that interface low-power digital logic to 115-volts AC (or higher). Est. cost: $8.
RADIO-ELECTRONICS May 1992 (v.63#5) pg. 47
Added Info ELECTRONICS NOW Sep 1992 (v.63#9) pg. 16
Convert any lever-type telegraph key into a simple relay.
RADIO-TV EXPERIMENTER Aug-Sep 1967 (v.23#1) pg. 38
Schematic for a 24-volt switch with indicator light that is used to activate a 220-volt air compressor via a relay (2-pole contactor).
SKINNED KNUCKLES #200 Mar 1993 (v.17#8) pg. 22