Fairchild Semi Optical was in full swing.

My former - through my sister - uncle-in-law (I suppose) was the
executive VP of Semi and had that operation to himself.

I suspect you have a servo with sensing.

Martin
Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/


_ wrote:
On Tue, 09 Sep 2008 17:50:35 -0400, Bob Engelhardt wrote:


The 4 resistors that are there must be 2 current limiting on the LEDs
and 2 pull ups on the detectors. Wait - this was made in 1976: did they
have LEDs then?


Yes. Commercial red LEDs were avialble in the 60's; I think by the 70's
they were on to other colours and higher output levels.


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