20-05-2013, 07:31 PM
Finally finished my meter!
It works fine on AC and DC and is accurate when compared with other analogue and digital meters. The probes were a bit fiddly to make, notably the AC probe as for the 'business end' I used a piece of 1/4" diam rod in which I drilled one end (on the lathe) to accept a short piece of 1/8" diam brass sharpened to a point for the probe tip, soldered into the 1/4" brass rod. At the other end, I turned the 1/4" rod down to a thinner diameter and drilled a hole in the end to accept the feedthrough terminal so that it could be soldered into that end and the BAT85 diode and resistor attached. I've attached a few pics - not much more I can say really except that I'll probably fit an LED to show when it's on.
It works fine on AC and DC and is accurate when compared with other analogue and digital meters. The probes were a bit fiddly to make, notably the AC probe as for the 'business end' I used a piece of 1/4" diam rod in which I drilled one end (on the lathe) to accept a short piece of 1/8" diam brass sharpened to a point for the probe tip, soldered into the 1/4" brass rod. At the other end, I turned the 1/4" rod down to a thinner diameter and drilled a hole in the end to accept the feedthrough terminal so that it could be soldered into that end and the BAT85 diode and resistor attached. I've attached a few pics - not much more I can say really except that I'll probably fit an LED to show when it's on.
Regards, David.
BVWS Member.
G-QRP Club Member 1339.
'I'm in my own little world, but I'm happy, and they know me here'
BVWS Member.
G-QRP Club Member 1339.
'I'm in my own little world, but I'm happy, and they know me here'
