No one has remembered the magnetic amplifiers (C1960) that were
considered reliable enough for control avionics.
Vacuum tubes and semiconductors were not considered reliable.
Back to the IC-less clock, I recently constructed a LED clock for a
TBolt.
To avoid the flicker effects and to get control of the LED intensity
I used BCD counters and
transistor drivers without multiplexing. BCD to hexadecimal was
arranged with diode decoding.
It looks half as big as the IC-less clock board with row after row of
transistors and resistors.
At least it will always show the correct time in a photograph.
cheers, Neville Michie
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