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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6 views

Switching a power supply for electroluminescent cable

I have some electroluminescent cable and it came with a battery powered inverter. I don't know much about the inverter, but I assume it's putting out about 100V at 1-2khz. I'm currently trying to ...
0
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0answers
34 views

Solid State Relay seems to have failed with short observed between output terminal

I had designed an SSR based AC motor controller a few months back and not really used it till a few days ago. I had tested the circuit when I first had it fabricated and it worked fine. When I tested ...
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1answer
39 views

Solenoid valves in series or parallel?

I already have the main solution and dosing solution tanks hooked up to each other, with solenoid valve S1 controlled by the liquid level switch through the DC power supply and DC/AC SSR (see image), ...
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0answers
17 views

DIY Mains Power Distribution

I am trying to create a product unit with an enclosed microcontroller that can function like a WiFi-enabled bulb (albeit with an entire enclosure and an enclosed audio speaker). I am a total beginner ...
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2answers
100 views

When/where to open and close a transformers output

I came across Beware of Zero-Crossover Switching of Transformers (TE Connectivity App Note) where they discuss about how you shouldn't switch a transformer at the zero crossing because it would have ...
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0answers
43 views

Connecting/disconnecting AC signal via uC

I want to mix up to four AC signals, that may or may not be DC biased, but will always be between -5.6 and +5.6. For that I was going to use a summing amp. (If anyone wants to talk me out of that in ...
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1answer
63 views

Relay Solution for Controlling Pumps with Arduino

I'm working on a hydroponics project that requires me to run 10 pumps for 15 seconds every 2 minutes. I was able to set this system up by running a relay board off of an Arduino, but the relays were ...
4
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6answers
231 views

Parameters when choosing a relay

Is this a good circuit to use as a air condition switch with a help of microcontrollers 5V? What relay to use in this situation? What parameters should I take into consideration when choosing ...
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3answers
69 views

Solid State Relay operation

A solid state relay specifies a trigger current of "7.5mA/12V". How much current does it draw at 5V? This is the relay. I'm controlling it with an Arduino which has a maximum current draw of 40 mA ...
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1answer
61 views

How can I switch two wires using solid state relays?

I want to add a "reverse" function to a brushless motor ESC - in theory, it can be done by simply switching any two of the three output wires - I would like do to it via solid state relays, but I am ...
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1answer
38 views

Will a 3-32 VDC input signal relay be damaged (or will work) with a 110 VAC input?

I'm looking at getting a SSR-25DA relay (http://www.amazon.com/gp/product/B0087ZTN08/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A1THAZDOWP300U) and using it with a temperature controller that ...
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1answer
30 views

SSR selection - how is on resistance related to output IV curve?

I am looking at the datasheet at the link below, and I can't for the life of me figure out what I am missing. http://www.digikey.ca/product-detail/en/TLP3542(F)/TLP3542F-ND/871299 This is a Toshiba ...
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1answer
46 views

Solid State Relay Input Resistor

I have a set of solid state contactors that I want to turn on and off with 24v PLC outputs. That contactor takes 4.5 - 15V inputs ( Changing the relay to the 24v input model is not an option right ...
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2answers
71 views

Why does my solid state relay not properly power a DC load?

I'm using a T108S02 to try to use a logical signal to turn on or off a small 3V DC toy. I'm not sure of the load current of the toy since my ammeter is not working. When I activate the relay, my toy ...
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0answers
28 views

ULN2003 similar circuit for 120VAC device

I am looking for an integrated circuit which maybe similar to a ULN2003 in the sense of being able to control multiple high power devices. I want to control 8 120VAC solenoid valves with an arduino ...
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3answers
80 views

Solid state relay doesn't turn off

I am trying to build a custom light setup for my computer desk. I want to use the scroll lock LED signal to control a pair of 12 volt DC CCFL lights run off the same inverter. The problem is when I ...
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5answers
180 views

Creating DPDT Solid State Relay with FETs

I feel like this should be a very simple question but so far I have not found a solution. My goal is to make the following DPDT relay circuit using MOSFETs: The goal is to connect INX to OUTX or ...
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1answer
61 views

Switch high frequency AC on/off at zero crossing

I have a 3 phase generator which is powering some system. (50Vrms @3A, with variable frequency from 50-5KHz). I've used mechanical relays to control each phase to the load. However, there was no real ...
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1answer
130 views

Using a Normally Closed PCB mounted Solid State Relay

Summary: Continuing my search for a solution to my problem, I have landed on normally closed solid state relays (NC 1 FORM B SSR). Could you tell me if I'm doing this right? What I need: What I need, ...
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0answers
61 views

Calculating signal attenuation for AC?

So we've got this; simulate this circuit – Schematic created using CircuitLab Which I've been told is equivalent to the sum of it's Coutputs to an AC signal; simulate this circuit ...
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0answers
53 views

Changing the resonant frequency on the fly?

So I have a coil and a default capacitor, they resonate at 150kHz. I have these three SSRs in place, they "add" a capacitor into the circuit. Here's a simplification of one switch; simulate ...
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0answers
58 views

Please help me with my capacitance-adding circuit

It's to add capacitance to a little tesla coil, (Bigger schematic, right click > open in new tab to view full size) Please note, I removed the capacitor and resistor on the gates. For some reason ...
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0answers
28 views

How to power multiple different LED light strips with a single adapter [duplicate]

I am building a fun electrical project soon using up to 16 LED light strips and I am having worries on either breaking them or under-powering them. The project takes in MP3 audio files and uses a ...
0
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1answer
90 views

Distortion in ADC output

I am working on Intel Galileo board and using its one ADC pin (A5) and one digital GPIO pin (pin 8). I am switching a relay from GPIO pin and using ULN2003A for isolation and LM60 temperature sensor ...
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1answer
87 views

Do we have a SSR relay technology that can stand 100 switching per second for a long time?

Are SSR relays capable of switching on/off 100 times per second for a long time? For example 1 hour? Does this affect the longevity!? I want to use relays for 5vdc control and 12vdc output with very ...
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0answers
53 views

Mechanical Relay Alternative for Switch 15A at 120VAC

I'm using 2 of these relays in a design, K10P-11D55-12 (http://www.digikey.com/product-detail/en/K10P-11D55-12/PB327-ND/254544). They're really the only ones that suit my needs but they're pretty ...
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3answers
658 views

What is the difference between a solid state relay and a transistor?

Along with the difference between a solid state relay and a transistor, I'm also interested to know if there are transistors that act a lot like the typical relay modules you can find on ebay (where ...
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1answer
178 views

Microwave Oven: Switching Magnetron (Transformer) with SSR [closed]

I've got a used microwave oven and want to improve it with a digital user interface. Is it ok to switch the magnetron (more precisely: the transformer from 230V 50Hz to some kV followed by a diode ...
1
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0answers
66 views

Interleave two analog signals

I am trying to interleave two similar but not identical pass-band (analog) signals (i.e., both have a center frequency of 15 MHz, and a bandwidth of 200 kHz) on a sample by sample basis. The idea is ...
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2answers
81 views

Can Solid State Relays be used “anywhere”?

With mechanical relays, they can be inserted anywhere in a circuit. Can SSRs be used anywhere in a circuit or are there certain gotchas that exist ? Consider this simple example where SW* is a SPST ...
0
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1answer
73 views

Is this SSR design recommended?

I want a hard power switch for some battery-powered BLDC motors, but the currents (5A, up to 20A transients) and voltages (up to 60V) limit the kinds of switches I can use. Because I want some small ...
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2answers
118 views

How to use a solid state relay in a dip package to drive a 24 vac relay

We have a fan coil unit in our server room where I work that utilizes a microcontroller to control temperature and humidity. I have an HVAC and electrical background so I am familiar with ...
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0answers
44 views

Solid state relay (optocoupled triac) is extraordinarily hot when on

I am using the following part: 3-32VDC input to 240VAC max 40A, KD20C40AX, that is connected to an Arduino Uno that drives a 5V control signal to the opto. The application, (output/triac side), is ...
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1answer
71 views

Solid state or Mechanical relay

I need to control a load that uses 20A at 110v. Should I use solid state or mechanical relay? Mechanical relay's contacts can lose conductivity over time due to high current and high voltage, I am ...
1
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1answer
71 views

Is there any way to use an ac load ssr with a dc load

i have a s202s01 relay that i want to connect to my microcontroller. The problem is that the load i want to control is a DC source. Is there any way to make that ssr (3-24dc, 8A 250VAC) work with a ...
1
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3answers
73 views

Guitar pickup / PhotoMOS off-state leak

Brand new member here. I'm using an AQY211EH PhotoMOS relay to switch guitar pickups via an Arduino, as shown below: This works great, with one minor exception: even when no power is applied to ...
0
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0answers
78 views

Low cost solutions for reversing 130VDC 20A motor

I have a treadmill motor controlled by an MC-60 controller board. The motor is reversible and I want to control the direction using an Arduino. The catch is that it's 130VDC and 17A (the voltage ...
0
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1answer
165 views

Connecting SSR relay

I bought a cheap SSR relay (SSR-40DA) on ebay and like to connect it directly to arduino, Schematic on website (http://www.fotek.com.hk/solid/SSR-1.htm) shows that LEDs already have resistors in the ...
0
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1answer
42 views

What should a ture RMS Voltage meter read on the load side of a zero fire SCR?

I have a 3 phase zero fire SCR/SSR set that has 480V input. I put my Fluke 289 (which is a tRMS meter) across the different phases on the load side. Then adjusted the output. The voltage read ~470V ...
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2answers
73 views

Possible solutions instead of 12 relays

First of all i am new to electronics, but have some basic idea. I want to create a USB switcher with arduino, which will control "where" the usb device is plugged in, instead of unplugging and ...
-2
votes
2answers
362 views

Need circuit to Switch 240v a.c. mains with 3v or 5v

I have the IRFP460 power transistor which if I understand correctly can switch 20A/500V on 20v input. I am wondering what a circuit design would look like that would allow me to either (a) switch ...
0
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1answer
67 views

Fuse and AWG choice for immersion heater circuit

I am planning to operate a 1500 W resistance immersion heater with an SSR and I'm trying to determine which fuse and AWG wire to use. The 1500 W heater on 115 VAC should operate at a current of around ...
0
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1answer
333 views

Using two Mosfets for AC

Im having trouble getting my head around using two mosfets to pass AC. I have reduced my schematic to its bare bones to help keep it un-cluttered. The aim of this circuit is to use PWM to dim a bulb ...
1
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4answers
197 views

What kind of component would I need to put a break in a RS-485 bus?

I'd like to have some kind of electronically controlled switch (transistor, relay, solid-state relay, etc) that acts as a break in a RS-485 bus. The effect I would like is to optionally split the bus ...
1
vote
2answers
103 views

SSR with low-flow switch to control heater

I'm trying to install a low-flow switch (circuit is open below 0.1 gal/min, closed above that) as a safety measure on an immersion heater, but I have some questions about the setup I've come up with ...
2
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1answer
310 views

Verify relays soldered onto a circuit board

Hello I need to verify a couple of relays for proper functionality. They are soldered onto a PCB as shown in the attached image - labelled RELAY 1 and RELAY 2. Online tutorials take a stand-alone ...
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2answers
110 views

100v audio source volume control / distribution

I have an audio signal from a class-d 100V and 500W. amplifier. I want to distribute this to 16 different sets of speakers and control the volume of each set individually. I am unable to find any ...
0
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1answer
482 views

Switching frequency of a solid state relay?

I bought a SainSmart 4 channel solid state relay recently. I am planning to use an Arduino to control some Christmas lights I've put up around my home. My question is: How fast can you switch SSR's on ...
1
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2answers
268 views

Solid state relay (or equivalent/alternative) to drive 6V DC from a 3.3V micro

I have to open/close two wire from a closed device. I cannot open due to it's under warranty, and the only part that I can open and modify is an external button that connects the two wires. Firstly I ...
0
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3answers
328 views

Should I use a snubber or solid state relays on a 24 vac circuit?

I'm trying to create a smarter controller for my hydroponic systems. I have an arduino controlling a sainsmart mechanical relay. The load on the relays are 24 VAC orbit sprinkler valves. Everything is ...