Heath VTVM]

[Ron]

Many years ago (this was way before Alkaline batteries
became available), it occurred to me that the VTVM (V7,
at the time) battery could be replaced by a simple
circuit, consisting of 6 diodes, two resistors and two
electrolytic caps.

I have no idea what the circuit under discussion consists
of, but assume it is similar to the one I concocted.
Probably, a simplified version consisting of a single diode
rectifier (mine was a bridge) with no voltage stabilization
(mine used a couple of diodes). In mine, the transformer
filament winding survived for quite a few years, until I
finally sold the unit, replacing it with a IM-13. My VTVM
was used on a daily basis, running off 50Hz mains.

-- Ron



Malcolm Leonard wrote:
>>
>> This is a controversial issue if it connects to the transformer as a
>> former
>> Heath engineer once posted a warning here,about  long term transformer
>> damage from the extra current draw used to power the battery eliminator
>> circuit.I have not verified this with personal experience.
>> Malcolm
>> ----- Original Message -----
>> From: "eugene shapiro" <genro at JUNO.COM>
>> To: <HEATH at LISTSERV.TEMPE.GOV>
>> Sent: Wednesday, October 27, 2004 2:20 PM
>> Subject: Heath VTVM
>>
>>
>>> I have eliminated the battery in my two Heath VTVM with simple circuit.
>>> Anyone interested, Can send via email. W0DLQ  genro at juno.com

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