"Sylvain VAN DER WALDE" wrote in message
...
Hello all.

At the present time I'm not trying to get it from the distributor,
although I may not have any choice.
Now, we're not dealing with the usual volume control (potentiometer) which
has 3 terminals (one connected to a wiper, and the others connected to
each end of a resistive track).
No, this damn "little critter" has 7 terminals and 2 mounting lugs
(printed circuit mounting).
It has a blue body measuring 16x15x5 millimetres.
Looking inside: the metal wiper assembly is attached to the plastic
spindle, and has 2 separate sections (one with 3 wipers, and the other
with 2).
It looks as if there are 3 or 4 resistive tracks (it's difficult to be
precise without spending more time to observe them).
Has anyone seen or heard of such a volume control? Is it a proprietory
(I'm not sure of the spelling) or a standard part?
It's completely sealed, so I couldn't use my switch cleaner (which has
always worked for me).
Anyway, I've had to snip though the terminals and mounting lugs, as it's
the best way to deal with a "plated through" PCB.
Can anyone understand/explain the design theory behind this item, and/or
suggest source/s of supply?
P.S. I believe that the receiver is designed in the UK, but it's made in
China.
P.P.S. If it had been any other fault, I would have sent the radio to Pure
for repair (if such a repair was deemed economical). I have many radio
receivers.

Thanks in advance.

Sylvain.

It sounds to me that the "resistive tracks" are in fact on/off contacts and
the device is in fact an "encoder disk"
The microprocessor looks at the state of the switches in real time and
can determine the direction and speed you are turning the knob and
adjust the volume accordingly.

Usually there is no need for a mechanical stop, as on a pot.

Does that make sense?
--

Graham.

%Profound_observation%