[GreenKeys] 'schmidt

[WB6BLV]

Jim R

I have a Kleinschmidt loop supply with 8 taps on the input and
I think 6 on the output to set the current fairly close.  However,
you can make virtually any loop supply 'constant current' with
the addition of an MJE340 and only a couple of other parts.
For a loop supply similar to the ST-6 you need litle more than
a transformer, rectifier, single filter cap, and wirewound current
limiting resistor.

If you want the 'schmidt supply I will get its weight and prepare
it for the journey.  

If anyone on the list is running 'schmidts (AFTER the TT-4A)
I should still have the diagram for 60/67/75/100 wpm switch 
selectable motor speed control (all speeds with one motor and
no gear changes, can change speed on the fly) with optoisolator
speed sensing and thyristor phase control of a series (not sync)
motor.  This technique is seldom successsful with TTY Corp
machines, since the clutched loads are quite a bit greater than
those on the 'schmidts (part of the reason the latter run quieter,
have a less powerful motor, and of course then less weight).

For what machine do you need copy lamp and crank?  I think
Tom K wants the 'schmidt crank, lamps, and a loop supply, but 
I have some TTY Corp units somewhere.

You can reach me here or off list


John
WB6BLV at inreach.com