7.4v output from 12v supply help

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Daz69
Posts: 4
Joined: Thu Dec 08, 2016 6:58 pm

7.4v output from 12v supply help

Post by Daz69 » Mon Feb 06, 2017 1:01 am

Hi all.

I need to get 7.4v output from 12v input. I have some 7809 regulators and a schematic to get this from 12v to 9v, but I need 7.4v to run a Canon camera on my telescope. Is it a case of fitting a resistor of some size, and if so, where would this go (I presume after the final capacitor and before the output socket), and what size resistor would I need? Any advice is greatly appreciated.

Thank you.
Daz

dgokid0
Posts: 1
Joined: Thu Feb 09, 2017 12:11 am

Re: 7.4v output from 12v supply help

Post by dgokid0 » Thu Feb 09, 2017 3:10 am

Go to top of this page Electronics 2000 and click on download tab and download electronics assistant. You will find a calculator for voltage regulator out-put adjustments in adjustable or fixed V-regulators. Hope this helps.

David
Posts: 219
Joined: Sun Oct 04, 2015 6:18 pm

Re: 7.4v output from 12v supply help

Post by David » Sun Feb 12, 2017 7:06 pm

I think the best device to use will be the LM317T. These are very cheap, and the data sheet can be found on the internet. It should do all that you want.

magpie
Posts: 32
Joined: Sun Sep 06, 2015 11:34 am

Re: 7.4v output from 12v supply help

Post by magpie » Mon Feb 13, 2017 11:38 am

Try a buck converter.This device can be purchased in a modular form and ready to go, with just 2 wires in, and 2 wires out.The output voltage is adjusted by a multiturn
potentiometer on the unit. Amazon e boot 6 pack LM2596 about £9.

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