As to our hardware: the valve/tube audio oscillator could provide watts of
output. I can't remember if we had to add a transformer eg speaker
transformer in reverse. The venue was a government department training
school. That particular lecture room was adjacent to the site technical
equipment room and projection booth. The equipment room housed a couple of
racks of comms, telephone and PA and time-announcer/bell ringer etc. Wasn't
a problem to park the large osc in there. The single pair jumper wire [used
for interconnecting the racks via tag blocks ie mdf, idf etc] was noticable
running between the top of the projection window frame and the clock. It was
an old building and pretty scruffy looking which helped with the lack of
extra camo.
John K.
----- Original Message -----
From: "A.J. Franzman" <[email protected]>
I always wondered just how
it was done, and the size of the hardware that would be required. Of
course today it's fairly trivial to do in a small package, but back
then, I'm not so sure.
On Jun 30, 1:01 am, "JohnK" <[email protected]> wrote:
All this talk of line frequency reminds me of when we attached a
'powerful'
audio sig gen to the lecture room clock back in 1968. Got us 10 mins less
boredom.
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