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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Making my own kotatsu

I want to make my own kotatsu (a small table with an heating element underneath) and I'm considering using a "heat lamp" as the heat source (one of those aimed at reptiles, fits in a normal light bulb ...
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4answers
130 views

Relay alternatives that are silent and support 500mA+

What can I use as a silent "general-purpose" relay alternative? There are various scenarios where I will need a relay-like device that allows me to control one circuit with a separate isolated ...
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1answer
52 views

What's wrong with my static relay connections?

Im trying to use a static relay for the first time. It is an HFS5, supposed to turn on/off at ~5V. Soldering is not clean but I have triple checked with a multimeter that the connections are ok on ...
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1answer
97 views

Normally closed SSR won't work with grounding out a magneto's primary to ground

I've been trying to find a device that will ground out a magneto's coil (primary kill wire) in a normally closed state without using a mechanical relay because I want my circuit to be all solid state. ...
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35 views

Mounting SSR + HEATSINK

I have made a AVR based Bluetooth mains controller. The idea is to be able to control my AC using my phone. Since I would be controlling an AC, I figured I would be needing a solid state relay with ...
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52 views

Dimming SSR Circuit - Verification

I am designing an SSR circuit for the purpose of controlling Christmas lights. Specifically I have the following two goals. Switching & Dimming incandescent strings Switching LED strings - I ...
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3answers
72 views

Can I use this relay for DC

http://www.dx.com/fr/p/ssr-25da-25a-solid-state-relay-white-134494#.VDmPWPl_uap It says AC output but how can this transform DC to AC ? Shouldn't this act like a switch ? If my circuit is DC and I ...
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1answer
80 views

AC AND DC Solid State Relay (SPDT) Circuit?

I have been looking to replace this SPDT switch with a solid state relay. However I learned that the switch could either have a 120VAC or 30VDC or even be used to switch an input on the controller to ...
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1answer
78 views

What kind of protections are needed to control an AC motor (230 V) using a microcontroller?

I need some guidance with surge-protection of the SSR and also how to safely bring the motor to stop (since it's an RL load, the inductive current has to die out). I found a schematic online, but have ...
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3answers
132 views

Standard Relay vs SSR vs TRIAC for Switching CFLs

I'm confused weather I should go for a standard electromechanical relay (EMR) or a sold state relay (SSR) to switch CFLs @ 220V with 100W max load. This is for a commercial product with the following ...
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1answer
165 views

Solid State Relay Capacitance Bad for Audio?

Regarding MOSFET optocoupler relays like the Panasonic AQW212, am I correct in understanding that the capcitance between the terminals and ground when the switch is open ("off") is around 100pF when ...
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3answers
269 views

Solid state circuit to charge caps in parallel then discharge in series?

Do there exist a solid state design circuit to do the following: Charge multiple capacitors in parallel for a certain amount of time from a low voltage DC source, then disconnect them completely from ...
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3answers
206 views

Protecting Solid State Relays from Short Circuits

I have 4 SSRs on my board with a steady state current rating of 2A and a peak current rating of 9A (Relays are CPC1976). This product is meant to be a commercial one and the relays will be powering ...
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2answers
75 views

Using triacs to switch more complex equipment than just motors and lights?

Obviously triacs have been well known to be used in applications which don't really require a perfect sine wave to function. However, what about say a triac to switch on and off more complicated ...
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4answers
240 views

Using an SSR photoelectric sensor with Arduino

I'm wondering if I can use this photoelectric sensor with an Arduino. I don't have much experience with these sensors or with relays, and I'm sometimes confused by output switch ratings, so I can use ...
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2answers
81 views

Voltage drop problem with my solid state relay

My solid state relay seems to be dropping the potential by 35 volts. I read about 80 volts from one end of a modified plug and the other end is plugged into a 120 volt wall socket. I have the hot ...
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1answer
43 views

Ensuring an SSR relay is dead

I recently purchased a used IEC Centra centrifuge with a refrigeration feature. Works great, except the refrigeration condenser never cycles off and as a result the chamber gets down to the minimum ...
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2answers
185 views

Solenoid stays on when output turned off

I have a power supply with 12V running into a the common on my PLC. Output 0 on the PLC is wired into a solenoid. The negative on the solenoid runs into the ground on the power supply completing the ...
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1answer
216 views

Is it possible to turn an audio signal ON/OFF using a solid state relay?

I'm thinking about controlling an audio signal (turning it ON/OFF) using a solid state relay switch? Is that even possible? If not, is there a different or easier way to do this? I'm a noob in the ...
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0answers
64 views

Choosing a SSR for CFL (Peak Current Rating)

I have to choose a solid state relay to switch some CFL lamps. The particular lamp is a 85W CFL (this is the actual wattage and not a comparison to Incandescent) which has a turn-on characteristic as ...
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1answer
40 views

What determines the communication speed? is it the physical link's speed or the communication card speed?

Two IEDs (Intelligent Electronic Device),an electronic relay and a gateway, are connected with Modbus RTU protocol over RS232. In the relay's manual it states that a speed of 9200 bauds can be ...
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2answers
110 views

Controlling Solenoids using Relay vs Transistor

In several examples, relays were used to control solenoids, others use the transistor. In my question, I'm looking at controlling 24VDC solenoid pneumatic valves. What are the advantages and ...
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2answers
294 views

Driving a contactor from TTL

I have 7 contactors that need to be controlled remotely (a permanent installation). These are controlled with 240V AC and, according to specs, uses 9.2 VA of power when turning on and 2.7 VA of power ...
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1answer
177 views

Which transistor should I use in place of a 5V relay to adjust brightness of lights (230V) with the Arduino?

I want to control brightness of lights (230V) with the Arduino, and I know that relays will just switch the lights on/off. If you have the circuit or any idea about which transistor to use and how to ...
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4answers
287 views

Can this 12VDC Relay be used for Switching 24VDC?

Can the Songle srd-12vdc-sl-c relay be used with 12VDC on its output? On top of the relay, it writes 10A 28VDC.
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1answer
146 views

Driving a load with 1.8V input

I have a Gumstix expansion board and want to make it communicate with some 24V PLCs. I've read these topics for reference: 1.8V to 5V, still not comfortable with transistors Transistors: why are ...
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1answer
171 views

How can I control brightness of a CFL with a microcontroller?

I'm new to electronics and just turned on and off appliances with an Arduino and relays. Now I also want to control the brightness of a CFL with an Arduino as I controlled the brightness of a LED. So ...
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2answers
176 views

How to wire this relay (silkscreen in Chinese!)?

I have the following relay and am unsure of how to wire it since the silkscreen is in Chinese :-/ Datasheet. I'm finding the datasheet difficult to interpret, but from playing around with my ...
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1answer
273 views

Arduino SSR 5V DC (Mager GJ-3FA-L)

I just noticed this SSR that was for DCV instead of all the others that are normally for AC. Although I can not find the datasheet for it, it does seem compatible with Arduino. eBay auction site ...
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1answer
106 views

Does low frequency PWM create reactive power in a transformer?

I got a 350VA transformer (230V~/24V~) which is directly connected to a heating unit at it's 24 V ends. The 230V end of the transformer are connected to 230 V~ mains over a solid state relay (SSR). ...
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2answers
86 views

5v contact closure SSR?

I want to have a contact open/closed when a USB port is powered on or off. When monitoring the USB port with a multimeter it takes >1 minute for the voltage to drop from 5v to zero. What is a simple ...
2
votes
2answers
135 views

Solid State Relay “fading” instead of dropping secondary voltage

I am using a (rather cheap-ish) chinese solid state relay (ssr) with 5V DC on the driving, 230V AV on the driven side (there's an ATtiny85 randomly letting devices run for 10-30 minutes, then cuts the ...
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118 views

Violation operating temperature

I have a problem on my current project. Relays are failing in Cold temperature. I am using a relay which has an operating temperature +85C to -25C to PCB. And my device under test is at -40C. Can ...
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2answers
123 views

Is there such a thing as a wireless solid state relay

I want to control multiple baseboard heaters in my house, but I don't want to put a raspberry pi connected to a solid state relay behind each baseboard heater, or even connect it to the thermostat, as ...
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2answers
219 views

Amplifying Small Signal With Solid State Relay

I am trying to control an electromagnet with a signal from a small microcontroller (a BeagleBone Black). Obviously, I need to amplify the signal. I have a lead from a power source that I want to pass ...
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1answer
78 views

SSR function con control panel

I'm new in electronics and would like to build an electric brewery with an electronic control panel. I found on www.instructables.com one control panel and is described as in following image. Could ...
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3answers
198 views

Can pwm pulse damage High Side Solid State relay IC ,driving Bulbs as load

I am driving a 12V, 10W Bulb and 12V, 5W Bulb (parallel connected) on one channel of high side driver solid state relay IC. For dimming effect, Bulbs are driven by PWM (Intial 3msec) then continuously ...
2
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2answers
127 views

Reducing voltage for solid state relay

I have a solid state relay which wants a 1.25-2.5V "activation" input, but my output from the micro controller is 5V. Is it possible to use a zener diode for this? Or do I need a buck converter? I ...
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1answer
166 views

Convert mechanical relay to solid state relay

I've been searching forums for a while trying to figure out exactly how to do this. I want the same functionality that a mechanical relay does. When the "coils" are de-energized, I want the 'heel' ...
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2answers
109 views

Minimizing voltage drop across SSR when using it to pull down a TTL digital input on another device?

I have a situation that I've run into a few times. I have a digital output card in my system that uses SSRs. I'm trying to interface to a device (referred to as my DUT from here on) that has TTL ...
2
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2answers
276 views

COM port goes down unexpectedly, but Arduino Leonardo keeps running

I am observing strange behavior with my Leonardo board. I use 9V AC/DC adapter to power it. Relay extension board is attached to digital pins, and relays are used to control several valves and ...
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1answer
530 views

controlling heating element using microcontroller

I have a 3000 Watt, 240 VAC heating element. (This is the heating element in a commercial espresso machine.) I want to use a micro controller to turn power to machine on and off. it has a pressure ...
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0answers
456 views

Can You Drive Back-To-Back MOSFETs (aka a Solid State Relay) Without Using An Optocoupler?

I was wondering if there was any way of driving back-to-back MOSFETs (with their sources and gates tied together as shown in the following image) without using an optocoupler? The reason is that ...
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1answer
295 views

Using Solid State Relay board for wired low-voltage switch activates AC outlets

pardon the noob question (though I have a EE degree back in the day, it's been a long time). Let me ask this simply, then explain my use case below. I am wanting to use several existing CAT5 cables ...
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0answers
74 views

Solid state relay voltage ratings — how to choose?

I am trying to control mains power, which around here is 220VAC @50HZ. Should I be using a SSR that's rated for 24-280VAC (Load), or one that is rated for 48-480VAC? The reason I'm asking is because ...
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0answers
138 views

Missing phase 3-quadrant TRIAC-based solid state relay for 3-phase engine

First of all, I'm a simple mechatronics technician student first time posting here, so please don't mind if I say something that seems completely stupid, since I consider myself to be a total newbie ...
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1answer
440 views

Replace thermostat with rasberry pi and Solid state relay

I want to replace my thermostat with raspberry pi board. I have already connected solid state relay to rasberry pi and it works just fine. The only part left to do is to connect solid state relay to ...
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3answers
105 views

Safety relay toggle time

I am currently working with software for a safety relay and during my work I started to think about how much time it takes for a relay to switch. The relay and it's data sheet I am using can be found ...
3
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1answer
220 views

How to select gate and gate-source resistors and N-MOSFET for controlling a 5V load from 3.3V input?

I want to control a 5V valve from my BeagleBone Black. As a single GPIO port only has 3.3V with 8mA I cannot use common relays. I found this thread: how to use a 3v output to control a 5v relay ...
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1answer
251 views

Using Arduino Uno R3 + Ethernet Module, how to control current pass to Lamps?

I have Arduino Uno R3 and Arduino Ethernet Shield V5. What's missing in order to control 6+ lights (bulbs) from my home? Those are connected to 220V AC. My idea is to send a packet via ethernet that ...