VTVM Battery

[Neil Morrison]

I think the better versions used a small ni-cad with a diode-resistor to
charge it. 1.2 is close enough that it should calibrate OK.

I have an English sub-standard multimeter that wants a 15 volt photo flash
battery for it's high range. I may feed it a set of lithiums, as the 15
volters are not easy to get now.

Neil Morrison
email:morrison at t-iii.com



> -----Original Message-----
> From: Larry Gauthier [SMTP:larryg at ismi.net]
> Sent: Monday, September 27, 1999 12:28 PM
> To:   Neil Morrison; HEATH at LISTSERV.TEMPE.GOV
> Subject:      Re:      Re: VTVM Battery
>
> Yep... I remember. It involved a dropping resistor (470 ohms 2watts, I
> think...) from the filament voltage of the tubes fed into a series of
> three
> silicon diodes (part number 57-27 ... heath's favorite diodes - 600v @ 1
> amp - but could any silicon diode), with a 200 mfd capacitor between
> diodes
> #1 and #2.

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