[sdiy] EXT Re: Discrete Op Amps

[Needham, Alan]

Jeri tells all...
https://www.youtube.com/watch?v=w_znRopGtbE


-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Roman Sowa
Sent: 11 April 2017 08:19
To: synth-diy at synth-diy.org
Subject: EXT Re: [sdiy] Discrete Op Amps

A little thin plate of germanium is enclsed in metal envelope with round holes on each sides. Then you put (manually with a tweezers of course) little ball of dopant and bake it so it melts. Then do the same to the other side.
Dopant is migrating into germanium during melting creating 2 p-n junctions.
Then connect wires to the little balls, those are collector and emiter, while the base is this envelope holding germanium plate.

Roman

W dniu 2017-04-10 o 21:49, Ingo Debus pisze:
>
> Have there ever been transistors that were not on chips? How were they made then?
>
> Ingo
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