[GreenKeys] Dovetron Advice

[Michael O'Day]

Mark,
 At age 61 I can sympathize with the "vision thing". My wife, who is a
jeweler, got a gizmo like this for examining small stones and it works
pretty well: 40 to 1000x Magnification, 2MP 8 LED USB 2.0 Digital Microscope
<https://www.amazon.com/gp/product/B06WD843ZM/ref=s9_acsd_top_hd_bw_b2zaITr_c_x_w/140-6705812-2766637?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=merchandised-search-4&pf_rd_r=37M0CMR2MMRF0J8HQWHQ&pf_rd_t=101&pf_rd_p=9b9defef-1637-52d9-90ae-cd2f87f1c07a&pf_rd_i=2742273011>
I have a friend who uses something similar to work with SMT devices. I
inherited her old loupe, which is similar to this
<https://www.amazon.com/Jewelers-Headband-Magnifier-Illuminated-Magnifying/dp/B075FYSNY6/ref=sr_1_14?s=electronics&ie=UTF8&qid=1512848678&sr=8-14&keywords=jewelers+visor+loupe>,
but without the light. As parts get smaller, we just have to get craftier!

Mike O'Day
N9ODM

On Sat, Dec 9, 2017 at 1:21 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:

> FWIW, I've never seen two Dovetron units exactly alike, so all those model
> numbers don't seem to mean much.  The older units have current loop drive
> included; the newer ones are RS-232 or MIL-STD-188 low level stuff and
> need an external current loop driver.  However I've been told that the
> newer ones still have the original power transformer and places on the
> main board where you can put the parts for the current loop driver.
>
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