A solid-state relay (SSR) is a switching device that accepts a small control signal to control a larger load current and/or voltage. In many ways they perform the same function as an electromechanical relay without any moving parts, they have many advantages but also some disadvantages compared to a ...

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40 views

Does a photo-coupled SSR need a series resistor for the internal LED?

I am trying to control an LCA710 SSR with an Arduino digital output. The data sheet says the control inputs are "CMOS and TTL compatible". It also has a schematic of the internals of the chip, showing ...
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2answers
60 views

Help with picking solid state relay

I am looking into a solid state relay to solve my problem here. I think I have found something that might work, but I am a little concerned as to weather it will work bidirectionally (I need DC ...
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1answer
119 views

Circuit to drive a Solid State Relay

I am looking to use an SSR on an Arduino board (5v logic) to control a standard 120v light bulb. I've heard people say you can "just drive this from a logic pin" - but the datasheets on the SSRs ...
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2answers
265 views

SainSmart 5V 4 Channel Relay momentary switch

Hey all i am wanting to hook this relay up here: What i am wanting it to be hooked to (output) is the pwr and reset switch on a PC motherboard to act as a momentary switch: I am also wanting to ...
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1answer
161 views

Driving EL wire from button push on a gamepad

I have a homemade arcade controller which uses a USB gamepad board. I would like to add some EL wire to it such that when a specific gamepad button is pushed it lights up the EL wire. The Gamepad ...
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118 views

Solid State Switch for magnet DC Generator

I'm using a flywheel-driven permanent magnet DC generator to charge up a bank of supercapacitors, 35 farad rated to 25V. For safety I limit the max charge to 22V via a comparator and a zener ...
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243 views

An opto-coupler/triac oddity — is it a problem, and is there a solution?

I'm using VO2223A opto-coupler/phototriacs to drive some low-current mains lighting with a PIC controller. All are working fine, but when the (DPST) mains switch is first turned on during system ...
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2answers
143 views

Controlling the Power of a Solenoid

I am trying to control the force of a solenoid. My current system has a bank of capacitors connected to a relay. In order to control the force (how hard I am trying to hit the object) I am increasing ...
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1answer
289 views

Wiring SSR with Arduino

I'm attempting to adapt a project with the wiring diagram shown here: http://www.glacialwanderer.com/hobbyrobotics/?p=9 But instead of the electromechanical relay used in the above link, I'm using ...
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2answers
89 views

Electromechanical Relay for VAC switching

I'm looking at PID devices for coffee machines. There's a tendency to use SSRs (for the regular reasons) but at the current levels (12 amps 120VAC) required these tend to be large (60mm longest ...
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4answers
530 views

How to cut power off when a certain voltage from a sensor is reached?

I've built a simple Ni-Cd charger (basically a 0.1C current source) for some 1300mAh cells, that I want to stop when a certain voltage is reached on the cell. I tried to design the switch with an Op ...
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1answer
100 views

VO2223A datasheet query — pin 5

This is a follow-up to a previous question, regarding the VO2223A opto-coupler/Phototriac. My understanding of the chip is that the IR LED triggers a phototriac, which in turn drives the gate of a ...
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188 views

Using the VO2223A to switch a 230Vac LED lamp

I'm looking for something that can switch on and off a 230 Vac, 26mA LED lamp, under microcontroller control. Would a VO2223A, driven by (say) a PIC or Arduino, work as a low-current SSR? The load ...
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0answers
72 views

Are both of my SSRs broken or am I doing something wrong?

I have one side of a 125VAC panel-mount indicator connected to the AC load points of a solid state relay. The control points are hooked to a microcontroller with a basic program that switches the ...
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2answers
281 views

Can I use a DC SSR that is switched by a PID controller to control the speed of a 12 V DC fan?

This is my first post here. Let me start by saying that I do not have an engineering background. I tinker with electronics in my spare time (Arduino, solid state low-power guitar amps, etc.), but I do ...
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3answers
149 views

Problem with high voltage in a project

I have a circuit that should be protected from high voltage. Is there any component other than a fuse that I don't have to change every time? Something like a switch that activates only when high ...
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2answers
384 views

Do I need a flyback diode?

I have some experience using automotive relays and triggering them using the output from a two-way radio aux pin so I am aware of the need to add a diode in parallel with the coil to protect the ...
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1answer
211 views

Solid state relay for home lights application

My application is controlling home lights. I want to use relays to switch lights on and off. My circuit should work on all kind of lights such as neon lights, halogen lights, strobe lights and others. ...
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1answer
177 views

Why do they add a TRIAC after an MCP3020 optocoupler?

I have a relay circuit (I use it instead of a relay) that uses a MCP3020, which I think does the physical separation of the two circuits (it's a LED and a photo cell inside a chip) and a BTA08 TRIAC. ...
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1answer
97 views

How to choose an external powersource with electronic logic [closed]

I am a n00b in electronics (software developer) I have 2 batteries bat1, bat2 (1.5 volts) available to me. I can only use one battery in my circuit. Let's say that if the battery is put in a holder ...
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3answers
214 views

Is it OK to run a signal junction at a “do not use” pin on a solid state relay DIP package?

I am attempting to retrofit an LCA710 solid state relay into an exiting PCB that has a mechanical relay. I will need to cut some traces and run some fly wires, but there is one IO line that would ...
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1answer
118 views

Using a solid state relay/ photoMOS relay [closed]

I'm trying to use solid state relay (Panasonic's AQY277 / AQV215) to switch a light bulb (100 V AC). To control the input, I'm using a signal generator in DC mode with 5 V as input. I have not yet ...
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1answer
180 views

Simple AC line state detection for digital controller input

Last year I moved into a house that has an old ('50s-'70s vintage) GE low voltage lighting control system. It uses 24VAC momentary wall switches to toggle solenoid/latch relays that feed 12 main ...
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1answer
47 views

Routing Current to Many Individual Channels [duplicate]

Possible Duplicate: How to implement an isolated connection matrix I need to put current on up to 30 lines; one at a time. What kind of electronics solutions are there to this kind of ...
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1answer
142 views

From a power consumption point of view, which should I use: SSR or Relay?

I'd like to find out which to use: a SSR (Solid State Relay) using TRIAC and optocoupler or a relay. My consideration are from the point of power consumed, my challenge here is to choose the less ...
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1answer
302 views

Can i use a SSR for switching a fluorescent light?

Can I use a SSR for switching a fluorescent light on or off? Specifically, can the SSR last for a long time, and can it withstand a very large number of on/off switchings? I would also appreciate a ...
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1answer
107 views

Solid State Relay Question

The solid state relay board functions normally by shorting + to input, but latches closed on device side of the relay until load is turned off or is disconnected. Is this normal for solid state relays ...
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1answer
301 views

AC-mains capable SSR (Solid State Relay) with very low leakage current?

Requirements: Can switch 230VAC Can switch at least 0.5A (i.e. ol' good 100W incandescent lamp) Wastes no more than 3mW in off state Low-on resistance is always good too The stated power usage ...
5
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1answer
248 views

SSR staying on (not reacting anymore)

I am using this SSR connected to an Arudino. I am running a very simple code similar to this one: (like the Blink example) ...
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1answer
1k views

Cannot get Sainsmart 8 Channel SSR board to turn on sprinkler's 24 V solenoid

I purchase a Sainsmart 8 Channel Solid State Relay board to control an 8 zone sprinkler system via an Arduino Duemilanove w/ ATmeg168. The SSR's LED lights up but my solenoids do not activate at all. ...
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1answer
828 views

How to connect 8 Channel 5V Solid State Relay Module Board and OMRON SSR 4 PIC ARM AVR DSP Arduino

I have purchased a 8 Channel 5V Solid State Relay Module Board.OMRON SSR 4 PIC ARM AVR DSP Arduino, from your Amazon bargains site. I am wondering if there is a diagram to connect this up. On the ...
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1answer
847 views

Switching a 3 phase pump using a solid state relay

I made a remote (GSM) controlled module for a 3 phase pump close to my friends house. The pump should run at night, and walking the 1km to the switch while they are sleeping is the problem. The ...
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4answers
3k views

Optocoupler/relay type for isolating two DC circuits

I have recently started experimenting with an Arduino and would like to control a seperate circuit (for example, a small and cheap digital video camera powered by battery) from my arduino. Basically ...
4
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6answers
4k views

How do I get proportional 240V AC output from an Arduino-based PID controller to “dim” a rice cooker for a Sous-Vide project?

I'm making a PID controller for Sous-Vide, using an Arduino. I'm trying to decide how to control the output. Using an SSR as an on-off switch on 240V AC will probably give me the result I'm looking ...
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1answer
113 views

If I made an h bridge out of silicon controlled switches, would I still need a driver?

My question is relatively simple. If I arraged four silicon controled swithces, like the one here, to form an h bridge, could I drive it directly from the logic level? Since only gate to gate voltage ...
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5answers
1k views

What would a professional use to switch sprinkler solenoids?

As evidenced by several previous questions of mine, I'm working a project to design a sprinkler controller. This involves driving one of 16 solenoids (well, probably only one at a time...) based on a ...
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2answers
524 views

1.8v GPIO controlling 5v 10mA solid state relay

I have a Crouzet 84 134 900 solid state relay that I need to control with a 1,8V GPIO output from a Gumstix Overo Summit expansion board. I've tried the circuit drawn up for me in this answer, however ...
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1answer
464 views

Silicon Controlled Switches: applications&suppliers

I came across this description of what are called "silicon controlled switches." I always look to balance n/p-channel electronics for stability, and using these silicon controlled switches seemed like ...
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2answers
188 views

Is this part (given picture) an EM relay, relay-controller, snubber?

Here is a rather bad (low resolution, grainy) picture of a circuit board that claims to be a 2-channel 315MHz ASK/OOK type remote controlled relay set. I can identify the relays, but not the big blue ...
5
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2answers
730 views

Transistors: why are resistors needed?

I have a solid state relay which needs at least 3V to activate, and I need to toggle with a 2.3V output from a microcontroller. I've also got a 6V 1A power supply which I can use to power the relay. ...
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1answer
382 views

HSR412 (solid state relay) parallel circuit connection not working?

So I got some HSR412s and connected them to my Christmas lights in a serial circuit. It worked great and as expected except for one caveat.... It was getting really hot. I realized I was putting ...
3
votes
3answers
2k views

SSR vs optocoupler with TRIAC output

I've designed (and mostly implemented, now) a system for turning on and off 24VAC solenoids. In order to achieve this, I used optocouplers with TRIAC output (Sharp PR26MF1xNSZ series). The datasheet ...
9
votes
3answers
2k views

Equivalent circuit of a solid state relay

I want to switch 50V AC voltage. Maximum drained current will be 5A. Frequency is 50Hz. Switching speed is not important, can be real slow, it is not a problem in my application. I wanted to use ...
4
votes
2answers
2k views

What is a phase difference between voltage and current?

I was reading the question here with some interest, because I am in the end stages of construction on a project that involves 16 solid-state relays. I'm using non-zero crossing type, because that's ...
4
votes
4answers
1k views

Is this a proper use of a PNP transistor?

I'm attempting to use a transistor to switch on and off an SSR, which in turns switches on and off a solenoid. I originally used an NPN transistor (2N222), but this caused problems when the MCU ...
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4answers
432 views

Pulldown resistor on MCU output?

I'm using an MCU to drive a set of SSRs, and whenever I reboot the MCU, the outputs that I have attached to the SSRs go high temporarily. I know that a pullup/pulldown resistor can keep a CMOS input ...
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2answers
362 views

How do I put an LED in series with an optotriac?

I have a set of SSRs (Vf=1.3V, If=20mA) that I am using to switch low-voltage AC loads, and I would like to have a set of indicator lights, one for each switch. Is it possible to simply put another ...
5
votes
2answers
982 views

How do I read a datasheet for a solid state relay?

I'm looking to use several (12-18) solid state relays to control a set of water valves (24V AC solenoids, 20ma holding current, 40ma inrush current), and I'm having trouble finding suitable parts, ...
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1answer
685 views

Can I use a solid state relay to control a DC current?

Can I use an AC solid state relay to control a DC current as long as the DC voltage doesn't exceed the rated AC voltages? I want to control a solenoid but I'm concerned about the inductance problem ...
3
votes
2answers
348 views

What kind of effects does a relay have on signals?

Currently I'm working on a DDS based function generator. The idea is to use an AD9834 chip that will generate a triangle/sine or square wave. With some amplification electronics I want a configurable ...

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