[sdiy] Nifty slider boards

[Oren Leavitt]

On 12/29/2010 6:22 PM, Tim Ressel wrote:
> Hey,
>
> I see Electronic Goldmine has pot boards for graphic EQs:
>
> http://www.goldmine-elec-products.com/prodinfo.asp?number=G18062&utm_source=Electronic+Goldmine+Newsletter&utm_campaign=06b2923175-Dec29&utm_medium=email
>
>
> http://www.goldmine-elec-products.com/prodinfo.asp?number=G18065&utm_source=Electronic+Goldmine+Newsletter&utm_campaign=06b2923175-Dec29&utm_medium=email
>
>
> Pretty spiffy!
>
> --TimR


Follow up on this thread...

My order has arrived today.

The sliders are Alpha (probably a customized version) have a center 
detent, and a center tap connection to the resistance element, which is 
connected to ground on the pcb.
The min and max ends of the pots are on common busses, presumably part 
of the feedback loop of the on-board summing amplifiers.
I don't know yet what the resistance value is.
The wipers each have a pad on the back-side of the board that I assume 
goes out to the individual filter for that pot.
The wiper connections have the aforementioned solder blobs/bridges on 
them - I'm talking big, up to 0.25 inch buck-shot-sized blobs here. 
Somebody was heavy-handed with the solder for sure.
The op-amps on the boards are JRC2043D standard DIP8 duals.

The end product these EQ boards go to is here:
http://www.ashly.com/product/gqx-series.htm

In a nutshell - bunch of sliders, with a grounded center tap, all 
parallel connected in the feedback loop of an on-board summing amp with 
a master boost/cut gain control and a power "on" indicator LED.

- Oren