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tnc2.1
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1990-09-12
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805b
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19 lines
TNC2.1
1 kohm (1/4 watt, 5 or 10%)
1.5 kohm (ditto)
7 inches of #30 wire-wrap wire
2 each 1" pieces of insulated sleeving
(1) Remove the 470 ohm resistor R34 adjacent to the battery and replace
with the 1.5 kohm resistor. Solder both ends, but leave the end
nearest the battery a bit long for the moment.
(2) Cut the trace on the PCB between pins 11 and 12 of U14 (if you refer
to the TNC2 schematic #3, you will find that U14 has 3 unused gates -
this modification uses 2 of them).
(3) Run the wire-wrap wire from U14 pin 11 to U7 pin 9. I tacked this
wire down several places along the board using dabs of cyanoacrilate
"super glue" to keep it neat.
CONTINUED IN FILE TNC2.13