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Need to amplify Amperage or find a relay

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Patrick2269

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how to amplify amperage

I am working with 3VDC at 10mA that I want to use to turn on a relay with; so far I can’t find a relay that will work at that voltage and low current. I do have a 3VDC relay but it needs 60mA to turn on.
So I would like to know if there is a way to amplify the amperage from 10mA to 60mA, if so what will I need?
 

amplifying amperage

3V * 10mA = 30mW of power that you have at your disposal ..
In theory you can generate 60mA out of 30mW but the output voltage (assuming 100% efficiency) will be 30mW/60mA = 0.5V ..

So, as you can see, any micro-power relay is out of question ..

However, 3V and 10mA can be used to drive an optocoupler and the other side of an optocoupler, which can be a transistor, or a triac can be used to switch bigger loads ..

Regards,
IanP
 
amplifity amperage

so is a optocoupler some kind of solid state relay, my load on the relay will only be 5VDC at 8mA
 

amplify amperage

I think an optocoupler will be ideal for your application and switching 8mA at 5V can be done by easily done by common and inexpensive units .. see picture below ..

Rgards,
IanP
 
amperage amplification

Think you very much, now the fun part is to find one and where to buy it.
 

You shouldn't have much trouble .. optcouplers are readily available ..
As in most cases the forward volage accross the "primary" diode is 1.5V, don't forget to connect ≈220-300Ω resistor in series with it ..

Regards,
IanP
 
Solid state relay ..
 

you can use a transistor and give ur signal at the base of the transistor and take the current output from the emitter. It is quite simple.........
 

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