OC71 - crystal set

From: Glenn Rainey <gm0kma_at_yahoo.co.uk>
Date: Fri Aug 10 11:07:26 2001

Hello folks ..

apologies for the 'sporadic' inquiry - I pulled the
text below ## off a search ...

crystal set / OC71 amp .....

Have searched FAR WIDE and ENDLESSLY for this circuit
(and the book containing it which I borrowed from a
library, ca. 1968) and dutifully returned.

If you have any pointers these would be most
gratefully received !!

I have located a *similar* circuit at
http://home.t-online.de/home/gollum/dt.htm

mine had one output transformer, 2 OC71s (well, lots
were burned in the process) and was constructed on a
terminal block .... ah ! the nostalgia !

I shall attempt to mail this message also into
discussion group
cheers

Glenn,
GM0KMA
Scotland

###########

Subject: radio kits
From: Adrian Graham (agraham_at_ccat.co.uk)
Date: 12/13/00-05:35:01 AM Z

> Date: Mon, 11 Dec 2000 18:39:07 +0000 (GMT)
> From: ard_at_p850ug1.demon.co.uk (Tony Duell)
> Subject: Re: Fw: Professors worry that engineering
students
> don't tinker
>
> involved). You started out making a crystal set,
then added a single
> audio stage (OC71), then a second stage (another
OC71), then added a
> loudspeaker (using an LT700 output transformer). And
finally
> you replaced
> the crystal detector with the OC45 regenerative
stage.
>
> I think the book is still around, even if the
transistors are hard to
> find now. I remember the son of a technician at a
place I was
> working a
> few years back was building one -- I managed to find
him some OC71s.
>
> I thought just about all UK hobbyists built this at
one time
> or another...

Nope - I had (and still have) my Radio Shack crystal
radio kit to tinker
with, followed by one of the Science Fair electronics
kits where you had
loads of spring terminals and small jumper wires to
build circuits
with......I found it the other day and it was dated
1973 :)



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Received on Fri Aug 10 2001 - 11:07:26 BST

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