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How to build a cheap LED voltmeter | 17 comments (17 topical, editorial)

Re: How to build a cheap LED voltmeter (3.00 / 0) (#16)
by BT Humble (bt_humble@bigpond.com) on Tue Jan 4th, 2005 at 02:43:10 PM MST
(User Info) http://www.humbletown.org

if you ar going to use the meter to control things ths looks ok. if you want to measure voltage, you can get a digital (cheap one but seems to work fine) from harbor frieght for $8.00. I got one on sale at $3.99. Compared it to my two good HP meters and found it was off about 0.5% on the dc volts setting. Opene it up and adjusted a trimpot to read the same as my HP's. Not a bad meter for 4 bucks.

Basically my reasons for using this rather than a cheap digital meter are the same as listed here:

http://www.homepower.com/files/bat-o-meter.pdf

Essentially, you don't have to keep replacing 9V batteries in this one, and you can tell from the other side of the room if your battery is getting low (without having to refer to a chart of voltage levels). Less is more! ;-)

BTH

[ Parent ]

How to build a cheap LED voltmeter | 17 comments (17 topical, 0 editorial)

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