Jim:
Very similar to a Q-multiplier: One switch to select null or peak, one pot
to adjust the null, one pot to adjust the peak and one pot to adjust the
frequency. However, by ganging pots, you can effect this with three or even
two controls.

--
Brian Denley
http://home.comcast.net/~b.denley/index.html


"Jim DeClercq" wrote in message
...
Hello.

I have started collecting expensive parts to build something as close as
possible in functionality to the original National Selectoject. They can
be had, and are expensive, and you cannot buy just one.

Ran into a problem. I have a picture of a Selectoject, and a circuit
diagram for a Selectoject, and I cannot get them to match up, logically.

If someone has one of those things, I would like to know, for each of the
four positions on its front panel, how it is marked, whether it is a pot
or a switch, and what it does when you use it. Perhaps I am easily
confused, but I just do not get it.

National used four controls for a good reason, and I cannot figure out
how to need more than three. I want my homebrew version to look the same,
down to the same shade of gray.

So, please, what is at each of those four positions, and what does it do?

Thanks in advance,

Jim

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