In article , Gazz scribeth thus
I have taken the 40 way channel selector switch out of an old CB radio, and
want to see if i can figure out how it works, with a view of using it on my
computer (i need 10 switch detents over a 90 degree arc for a control lever,
hence the 40 switch detents over 360 degrees of the CB switch gives me what
i want when i use a quarter of a turn on it)


I rather doubt that you can use that as a 1 pole 10 way switch as such
its likely to be sort of BCD coded .. and feed a synth chip...


The switch is made by uniden, and has the following markings on it...
SR-334, P-79 2-5A, they are stamped in, the UNIDEN word is cast in the back
plate as well as 'PSS-23'

i apeers to be made up of 4 x wafers, each individual wafer has 5 pins, and
they are stacked front to back, i.e. there's room for 6 pins, but one is
missing giving 2 space 3 pins, then the next wafer is 3 space 2 pins and
repeat.

that gives a total of 20 pins,

i'm going to play with the multimeter on it, but wondered if anyone knew how
they work internaly,

i need to make it work like a 2 bit gray scale rotary encoder, know how to
do that with a single pole rotary switch where there's an obvious 1 common
pin and the switched pins (uses a few diodes to give the A, B, AB, 0, A, B
AB etc output) but can i do that with this switch?

Probably best to sit down for a while with a meter and work it out;!..
--
Tony Sayer

I have taken the 40 way channel selector switch out of an old CB radio,
and
want to see if i can figure out how it works, with a view of using it on
my
computer (i need 10 switch detents over a 90 degree arc for a control
lever,
hence the 40 switch detents over 360 degrees of the CB switch gives me
what
i want when i use a quarter of a turn on it)


I rather doubt that you can use that as a 1 pole 10 way switch as such
its likely to be sort of BCD coded .. and feed a synth chip...

that makes sense, the switch's pins went via a 10 or so way ribbon cable to
the channel ic, terminology lets me down here... but the chip at the front
of the pcb that you soldered another on ontop of, with one pin left off
going to a switch... usually the output power switch, to give 80 channels,

but i havent done any playing with cb's for about 15 years, and all i did
was follow instructions for things like the 'cept' channel add ons, replace
output trannies, and faff about with echo chambers and multi tone roger
bleeps,

In message , tony sayer
writes
In article , Gazz scribeth thus
I have taken the 40 way channel selector switch out of an old CB radio, and
want to see if i can figure out how it works, with a view of using it on my
computer (i need 10 switch detents over a 90 degree arc for a control lever,
hence the 40 switch detents over 360 degrees of the CB switch gives me what
i want when i use a quarter of a turn on it)


I rather doubt that you can use that as a 1 pole 10 way switch as such
its likely to be sort of BCD coded .. and feed a synth chip...


The switch is made by uniden, and has the following markings on it...
SR-334, P-79 2-5A, they are stamped in, the UNIDEN word is cast in the back
plate as well as 'PSS-23'

i apeers to be made up of 4 x wafers, each individual wafer has 5 pins, and
they are stacked front to back, i.e. there's room for 6 pins, but one is
missing giving 2 space 3 pins, then the next wafer is 3 space 2 pins and
repeat.

that gives a total of 20 pins,

i'm going to play with the multimeter on it, but wondered if anyone knew how
they work internaly,

i need to make it work like a 2 bit gray scale rotary encoder, know how to
do that with a single pole rotary switch where there's an obvious 1 common
pin and the switched pins (uses a few diodes to give the A, B, AB, 0, A, B
AB etc output) but can i do that with this switch?

Probably best to sit down for a while with a meter and work it out;!..

If the OP still has the CB set, he could have a look and see what the
synthesiser is, then have a look at its data sheet. That might assist in
finding out what code BCD codes are in each switch position.
--
Ian