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Solid State Relay Circuits
#'s - R       S - Z



Last Updated: October 24, 2017 02:55 PM

Circuits Designed by Dave Johnson, P.E. :

50ua Current Drives Solid State Relay Requires Only -  Most solid state relays require at least 5ma and often more input control current, to fully turn on the device.  But such current levels often force battery powered circuits to use excessively large batteries.  The relay hobby circuit shown below demands only 50uA of input current . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

Bidirectional Solid State Relay -  The circuit below can switch up to 4 amps of current with a peak voltage up to 20v.  it is fully isolated using two inexpensive red LEDs.  One LED forms a red light source, which illuminates a second red LED.  The circuit takes advantage of the 1.5v. . . Circuit by Dave Johnson P.E.-May, 2009

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

1 oscillator drives multiple solid-state relays -  16-Mar-06 EDN Design Ideas:  A conventional electromechanical relay often makes sense for switching large amounts of load current on and off and when proportional control of the load’s current or voltage is unnecessary __ Circuit Design by Juan Ramón Vadillo Pastor, SOR Internacional SA, Saint Quirze Del Valles, Barcelona, Spain

120 VAC Lamp Chaser using Solid State Relays -  This circuit is basically the same as the 10 channel LED sequencer with the addition of solid state relays to control the AC lamps.  The relay shown in the diagram is a Radio Shack 3 amp unit (part no.275-310) that requires 1.2 volts DC to activate.  No current spec was given but I assume it needs just a few __ Designed by Bill Bowden

120 Volt AC Lamp Chaser using Solid State Relays -  This circuit is similar toLED clock using12 neon indicator lamps instead of LEDs.  it operates from2 high capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks.  High voltage (70 volts) forneon lamps is obtained from a small __ Designed by Bill Bowden

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 __ Circuit Design by Phil Harvey, Technology Integration Inc, Bedford, MA

220V Solid State Flashing Lamp with 555 -  This 220V mains operated solid state flashing lamp circuit uses a 555 timer IC to control the ON and OFF times of a TRIAC which controls power to the load.  The power supply for the IC is obtained by half wave rectifier (D1) , a stabilizer circuit (D2 and R1) and filter capacitor C1.  The lamp stays ON for about 1 second and OFF __ Designed by Popescu Marian

50ua Current Drives Solid State Relay Requires Only -  Most solid state relays require at least 5ma and often more input control current, to fully turn on the device.  But such current levels often force battery powered circuits to use excessively large batteries.  The relay hobby circuit shown below demands only 50uA of input current . . . Hobby Circuit designed by David Johnson P.E.-June, 2000

60 Watt RF Amplifier -  Soild state RF power amplifier using iRF840.  Simple and easy to construct.  iRF840 can handle a maximum power output of 125 Watts.  __ 

Bidirectional Solid State Relay -  The circuit below can switch up to 4 amps of current with a peak voltage up to 20v.  it is fully isolated using two inexpensive red LEDs.  One LED forms a red light source, which illuminates a second red LED.  The circuit takes advantage of the 1.5v. . . Circuit by Dave Johnson P.E.-May, 2009

Circuits protect outputs against overvoltage -  10/11/07 EDN Design Ideas:  Adding a solid-state relay and control circuitry to an amplifier's output provide as overvoltage protection __ Circuit Design by Dimitri Danyuk, Kiev, Ukraine

Electronic Breaker -  This circuit uses the on-resistance of the MOSFET as the current sensor.  Reset it by removing the input power or the load.  The circuit draws no current unless tripped.   __ Designed by Andrew R. Morris

High efficiency, legal limit, solid state linear HF Amplifiers -  Not a project yet, but very theoretical thoughts about very practical amplifiers!  __ Designed by Manfred Mornhinweg

Hybrid vacuum tube/solid-state audio power Amplifier -  08/11/14  EDN Design Ideas:  An audio power amp design that combines vacuum tube input circuitry with solid-state output and feedback components. __ Circuit Design by Craig D. Merz

One oscillator drives multiple solid-state relays -  16-Mar-06 EDN Design Ideas:  A conventional electromechanical relay often makes sense for switching large amounts of load current on and off and when proportional control of the load’s current or voltage is unnecessary __ Circuit Design by Juan Ramón Vadillo Pastor, SOR Internacional SA, Saint Quirze Del Valles, Barcelona, Spain

Protect outputs against overvoltage -  10/11/07 EDN Design Ideas:  Adding a solid-state relay and control circuitry to an amplifier's output provide as overvoltage protection __ Circuit Design by Dimitri Danyuk, Kiev, Ukraine

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SSR#'s - R       S - Z

 


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