Relay w/ transistor

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Dlou87

Member - Posts: 9

Joined: May 17, 2003

Posted: April 06, 2004 at 10:10 AM / IP Logged

Hey guys,

I am using a Wireless relay board to trigger the relay input on another relay which is switching on something. My problem is, the wireless relay board puts out a signal of 12v DC, and the second relay which it needs to trigger needs 14v DC to trigger on...so I heard that I can use a transistor to increase the voltage of the 12v to 14v, but I have no idea how I would do that?? So what kind of transistor would I use to bump up the voltage?

Thanx

xetmes

Silver - Posts: 586

Joined: May 18, 2003

Posted: April 06, 2004 at 11:07 AM / IP Logged

did you try the 14V relay with 12V? it may work just fine, 12V relays will trigger around 8V...

Dlou87

Member - Posts: 9

Joined: May 17, 2003

Posted: April 06, 2004 at 1:41 PM / IP Logged

Yes I did, and it would not trigger with the 12v source...so any help with how I can do this???

xetmes

Silver - Posts: 586

Joined: May 18, 2003

Posted: April 06, 2004 at 8:28 PM / IP Logged

well the problem is that a transistor can only switch power it can not make something out of nothing. If the maximum voltage is 12V in the system then you cannot make 14 V without some exotic circuits.

Toru

Copper - Posts: 102

Joined: January 24, 2004

Posted: April 07, 2004 at 12:50 AM / IP Logged

Also known as a capacitive charge pump.

xetmes

Silver - Posts: 586

Joined: May 18, 2003

Posted: April 07, 2004 at 6:43 AM / IP Logged

yea a charge pump is one way, notice the first stage is an oscillator, you need switching. You can even get single chip solutions: like these

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Relay w/ transistor

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