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Tauno Voipio

On 12.12.20 19.34, wrote:
On Sat, 12 Dec 2020 07:56:15 -0000 (UTC), "Don" wrote:

Phil Allison wrote:

the Callins is in an epoxy sealed container

Interesting, but it doesn't answer my question:

Why was the circuit designed to use a Callins in C7?

Danke,

Was it designed that way?

That circuit was barely designed at all. What's it supposed to do?

Agreed.

There is a voltage-controlled UJT sawtooth generator, with
outputs sent to three places:

- direct output,

- a differential pair-rectifier to cut it at the
middle for a (maybe) symmetric triangle,

- a Schmitt-trigger to create a variable width pulse

There is plenty of opportunity for improvement even when
using the block diagram (and forgetting the UJT).

--

-TV