Voltage Sensitive Switch

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  #1  
Old 08-03-18, 09:24 AM
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Voltage Sensitive Switch

Ideal relay for my purpose.
Unfortunately, there is no way to buy it and the web page itself is several years old.
Does anyone know where I could buy a similar device?
 
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Old 08-03-18, 10:26 AM
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Do you need ALL those features? Including light detection and variable input V thresholds, etc?
In fact, is this for an automotive app?
 
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Old 08-03-18, 12:27 PM
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Tells us what it is you want to do.

There is a alarm relay that runs on 12/24vdc yet can be activated by any DC voltage from 5-24vdc.
ELK 924 is one choice.... Elk products/literature_Instructions&usg for elk924
Another similar choice.... Sensitive-Relay-24VDC-1Ma-DPDT
 
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Old 08-03-18, 05:11 PM
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Thanks for replies. I wanted to do exactly what they describe there, turn on the electric fan using existing sensors on my car engine. Meaning the input voltage is fairly low, in range 100 mV perhaps. And it needs to be adjustable.
I was already thinking developing my own (hours of work, etc) when I found something on eBay. I'ts amazing what a few dollars can buy ... W1209 12V -50-110C Digital Thermostat Temperature Control Switch Sensor Module. It comes with its own sensor, will see if I can make it work with existing sensors.
 
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Old 08-03-18, 05:52 PM
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Measurement input: NTC (10K 0.5%) Waterproof Sensor

I'm afraid with that W1209 module you must use the supplied sensor as the board is set up to respond to variable resistance from the sensor. Your car's sensor will have voltages on it that will confuse and possibly damage the W1209.
 
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Old 08-03-18, 06:18 PM
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I considered this, yes. It actually may even be better. This gives me choice to place the sensor on "cool side" of radiator and it will turn the fans on when the coolant after passing the radiator is still too hot. Need to experiment little to find correct threshold.
 
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