Solid state relays help

Other Hardware General Electronics
1

I need a 800mVdc to 900mVdc relay-- Normally open...but can handle at least 14Vdc...

Application i need it to trigger when my 900mV led blinks to trigger the 12v-13.8v circuit which powers a 12v led light connected to another pw source.....

so its a garage door opener converted with a 3vdc converter to power it then i use a momentary switch with that has a 12vdc led ring that I want to flash when the button is pressed .. there is also a 2nd momentary switch for programming ... the reason why i use the switch is the remote part is inside a fairing and is not accessible thus the need to make the 12vdv led work.. hope this clarifies..

2

Solid state relays are for AC only.

1 Like
3

Hi, @lamby422
Welcome to the forum.

How much current will you be switching in the 12V circuit?
What is your 900mV LED?
What is it in?
Can you get to the current drop resistor?

Can you please post an image(s) of the 900mV LED assembly?

Thanks.. Tom... :smiley: :+1: :coffee: :australia:

4

Here's a set of solid state relays designed for DC in a range of 25A to 100A:

image
image1350×868 154 KB

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5

With 900mV you'll need a transistor driver for the relay. As far as I know there are no relays (electro-mechanical or solid state) that operate at less than 1V.

Most LED operate with more than 900mV and with "regular" LEDs there is usually a current limiting resistor and maybe you can tap-into the higher-voltage side of the resistor?

There are DC solid state relays but they are (usually) not interchangeable with AC solid state relays. AC relays are usually built-around TRIACs and a TRIAC latches-on until current falls to zero, which is the next AC zero-crossing. With DC they just latch-on forever until power is removed.

6

This sounds like you already have an SSR, one which has just the IRLED without current limiting resistor.

Please show links to your components and a diagram.

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7

GDO_diagram
GDO_diagram855×695 100 KB

8

HI,

so i added the diagram below with pics..

the 900mV LED is part of the circuit that is with the board and lights when you click any button on remote.

the 12v circuit is another LED that is part of an external switch..
the LED has a rating of 5A/12v max

9

is the switch link

10

i looked at a few SSR LCA717 was looking good but i do not know if it would work (never used SSR before)

11

here is one i was looking at but not sure

12

here is the step down converter i am using

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13

I don't want to say an Arduino would make this super simple...but an Arduino would make this super simple, using a relay such as DaveX linked to. If you ever make the switch to DC to AC relay, don't forget that it's hot you switch, not neutral, for safety reasons. I use these all the time and it's about as easy as Arduino gets.

14

so my circuit is DC to DC i am just using 900mVdc to 12-13.8 vdc

15

I would try logic level MOSFET FQP30N06L to 12 volt automotive relay.

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16

What on earth is this "900 mV?"

17

900mV just under 1V

18

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