AC Millivolt Meter - UK Vintage Radio Repair and Restoration Discussion Forum

MrElectronicman · 10th Jul 2011, 5:01 pm

I have an AC millivolt meter that I built many many years ago from a design in one of the "Practical" mags (Probably PW), from the early 1960's. It uses 5 BC108's, plus another in a probe.

The range switch covers 6 ranges from 3mV to 1V, and there is another switch which is a range multiplier, either X1 or X10. It also has a plug in probe which I am guessing, since it appears to be an emitter follower,, might extend the range to 10Volts.

I dragged it out the other day since I have a spare 100uA meter which I am planning to use to replace the original, which is quite small since it was all I could afford at the time.

Luckily I have a hand drawn copy of the circuit, however I was wondering if anyone had the original article from the magazine they could scan for me.

David

KeithsTV · 10th Jul 2011, 10:35 pm

I remember it well as I actually built it. I've recently found the remains of it and am trying to resurect it.

Anyway here's the article.

Keith

MrElectronicman · 10th Jul 2011, 11:53 pm

Quote:

Originally Posted by KeithsTV

I remember it well as I actually built it. I've recently found the remains of it and am trying to resurect it.

Anyway here's the article.

Keith

Wow!

thanks for the article.

When I left the UK for Canada I had to dispose of a lot of things, but I had kept all the Mags which were of interest. While in Canada we had a flood in the basement and I lost most of my papers, not to mention an oscilloscope.

Now I am retired I am getting back into various things, and inspired by this forum I am again into valves, and transistors and recently built the ESR meter I found in another thread.

I originally bought a 100uA meter for the ESR project, as I could not find a 50uA one, but the very next day I found one and so I now have a 100uA meter looking for a project. Which is where the AC mV meter came into the picture.

Thanks once again
David

MrElectronicman · 11th Jul 2011, 5:47 pm

Here are some pictures of my unit, one with the original meter and the other with the new meter. The new meter is just sitting there, it's not installed yet

10th Jul 2011, 5:01 pm	#1
MrElectronicman Heptode Join Date: Feb 2011 Location: Washington DC, USA Posts: 619	AC Millivolt Meter I have an AC millivolt meter that I built many many years ago from a design in one of the "Practical" mags (Probably PW), from the early 1960's. It uses 5 BC108's, plus another in a probe. The range switch covers 6 ranges from 3mV to 1V, and there is another switch which is a range multiplier, either X1 or X10. It also has a plug in probe which I am guessing, since it appears to be an emitter follower,, might extend the range to 10Volts. I dragged it out the other day since I have a spare 100uA meter which I am planning to use to replace the original, which is quite small since it was all I could afford at the time. Luckily I have a hand drawn copy of the circuit, however I was wondering if anyone had the original article from the magazine they could scan for me. David

11th Jul 2011, 5:47 pm	#4
MrElectronicman Heptode Join Date: Feb 2011 Location: Washington DC, USA Posts: 619	Re: AC Millivolt Meter Here are some pictures of my unit, one with the original meter and the other with the new meter. The new meter is just sitting there, it's not installed yet Attached Thumbnails