Your solution to getting a Dovetron connected into your local
loop interests me.
I'm interested in driving a polar relay from a low voltage output
(perhaps RS232?). From what I can see from the Dovetron
schematic, it drives the FSK output from an op amp which has
supply rails of +/- 15 VDC. It's called a +- 6 volt output. It
has a 1k current limiting resistor. So I calculate about 5 to 11
mA current to the polar relay depending on whether the output op
amp is switching from rail to rail or is actually limited to +/- 6
volt swing. My op amp theory is a bit rusty, but it looked like
it would do the rail to rail from looking at the schematic.
My take away is that the 255 will switch with a lot less than 20 or 60 mil line current. Does that sound reasonable?
I'm thinking there needs to be an RC snubber in the circuit to
protect the solid state driver from "inductive kick".
--- ---- You said "tomorrow" yesterday. The above comments or recommendations are SWAG. Use at your own risk. John, W9DDD
Pins 3 and 7 are jumpered to put the windings in series aiding by bending the tube socket pins and tack soldering them together.
Tom N3CRK
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