[GreenKeys] Powering a Model 15 currentl loop from a 5VDC 250mA power supply - theory

[John Nagle]

W2HX wrote:
> How many devices in series do you think your model could handle?
> Just curious
> 
> 73 Eugene W2HX

    One.  It has to be matched to the load.  It's possible to
build ones for other loads, of course.  You'd need to increase
C2 and change out the LT3484-1 for a LT-3484-0, which has
a higher current limit.   You'd have to adjust R4 for a higher
holding voltage (probably double it), and increase V1 to maybe 7V or so.
If you want automatic load matching, that costs extra.

    My goal was to run a Teletype from a USB laptop without much
extra gear.  Multiple machines would go on multiple USB ports.

    Does anybody on here build surface mount, with the little
computer-controlled toaster oven?

				John Nagle