stepping up from o.1 volt dc to 9volts dc?

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granada1

New Member

• Aug 12, 2010

• #1

Hi, I am trying to increase dc voltage from 0.1 volt to 9 volts, together with enough milliamps to be able to power a spst reed relay. any ideas gratefully received.

thanks

 

MikeMl

Well-Known Member

Most Helpful Member

• Aug 12, 2010

• #2

Do you mean that you want to amplify a 0.1V change to cause it to pull in a small relay using an external source of power?

 

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granada1

New Member

• Aug 13, 2010

• #3

Hi MikeM1

yes, I am trying to amplify 0.1volts to 9 volts using an external dc supply, to trigger a small relay. thanks

 

MikeMl

Well-Known Member

Most Helpful Member

• Aug 13, 2010

• #4

What is the ground-reference for the 0.1V signal?

Two Darlington-connected NPNs; An OPamp amplifier with a gain of 100 controlling the base of an NPN or gate of an NFet; Use a DC supply which matches your relay. 9V relays are hard to find.

 

Last edited: Aug 13, 2010

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granada1

New Member

• Aug 13, 2010

• #5

Many thanks Mike ML for sorting this.