Sometimes the old stuff is still the best. At room temperature, a
mechanical chopper combined with a high-ratio step up transformer and
high impedance follower amplifier is unbeatable for low noise, low
impedance signal amplification. The solid state devices that replaced
mechanical choppers in
fier"
Robert G8RPI
From: Joseph Gray
To: Discussion of precise voltage measurement
Sent: Friday, 9 August 2013, 4:44
Subject: [volt-nuts] Cool looking old stuff
I'm helping the local surplus guy by going through some old gear and
checking it over. Sometimes I find something useful :-)
I'm helping the local surplus guy by going through some old gear and
checking it over. Sometimes I find something useful :-)
I just took apart a Millivac Instruments MV-37B DC Differential Voltmeter,
mostly because I was curious to see what was inside (I haven't powered it
on yet). Most of what I
