My EICO 752 came from E-bay, no idea if it worked or not. I made up the DC Power
cable for it, from #4 stranded wire, with terminals to match the power supply and also
to fit on the direct battery connection.

The schematic for this unit is here.

I used my portable boost unit (battery) to test this rig out. I had to assume someone had
used it mobile operation. Since they found the unit gets real hot, and had drilled a series
of holes in the side to let the hot air out of the case, which was closed, as in NO holes.


There was to my surprise, no problem with this supply, after checking the voltages
and looking at them with an Oscilloscope I couldn't find any problems with this
unit. So I grabbed one of the 753 transceivers from the rack put it on the bench
made the cable connections, and added a mobile speaker to the setup and turned
everything back on. A word here about running off a stand alone battery supply.
Don't get into a round table on AM it really drains the battery quickly on transmit
if there is no charge system also running at the same time!


Coming directly from the battery the input volts for the filament supply is 14 VDC, a bit
high for the filaments, but the manual says that is OK so I accepted it. The switch on the
unit (labeled S1) turns the power on to the EICO 753 as well as the DC supply itself.
What this means is you need to be able to reach the DC supply, and that means in the
vehicle passenger area for the unit.


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