[time-nuts] Non electrical time-nuttery

Bob Camp lists at cq.nu
Sun Jan 10 00:29:47 UTC 2010


Hi

The Navy certainly liked mag amps for control circuits. About the only other place I have seen them is in controls for fairly high power ovens.

Bob


On Jan 9, 2010, at 6:59 PM, J. Forster wrote:

> I don't think MagAmps were much used for logic, but Di-an made a family of
> core logic that would certainly work for the counters in a clock.
> 
> -John
> 
> =============
> 
> 
>> 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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