Poll! What do you use in your X-BOSOZ or BOSOZ for Volume Control and Input Selector?

[trango]

I've built the dantimax design and it seems to be a rather good design. But I will probably change to a DACT anyway...

[Duck-Twacy]

Originally posted by Duck-Twacy

- Thel CP-2500 pot - 85 euro for 2 deck (of 109 met motor). I don't know if they sell a 4 deck pot for balanced control. Only volume control, so you haved to add a input selector

Just noticed Thel has added a 10K 4-deck CP-2500 on their site. That wasnt there 1 or 2 weeks ago. Are they following these Bosoz threads?'

[zygibajt]

wow! that must be balanced right? How many positions?

No, it's not. This is ladder type attenuator which means one resistor in signal path and one to ground in each position.

The switch is regular Elma 4 deck 24 position one.

For balanced one would need 8 deck switch and twice the resistors.

You can build balanced attenuator using 4 deck switch , but that would have to be series type, quite inferior to ladder , but still better than many pots.

Bartek

[daly2k]

Hello, you can go to www.borbleyaudio.com and look at his suggestions for a balanced volume control. He uses a unique method to insure that the control is always perfectly balanced.
You can use either a ladder type or series type control.

dave

[hifimaker]

Here's the direct to Borbelys attenuator page:

http://www.borbelyaudio.com/upgrades.asp

-David

[lgreen]

volume control - front



volume control - back - ALPs

I find that these blue ALPs need to be used every so often or they oxidize,
you get little clicks when you change the settings. Not bad unless you let it sit for a
month or so.

Input selection- NAIS D4S 4 pole latching relays.
These are very nice but very expensive...if you can find them.

[PierreQuiRoule]

For my BOSOZ volume control, I used Blue Alps 4 X 10k log, purchased from Seletronic. I put one at the input, one at the output, et voila! full balanced volume.

Pierre

[wayne325]

I have the same problem so I'm building my own switcher
and volume control.

I'm using the attenuator circuits from the Pass Labs manuals,
the switching is by relays also. I'm also adding some nice
trickery to have output level displays using 7-segment LEDs
BLUE of course.

I use a PIC for control and a daisy chain of shift registers
to make it look like the PIC has 64 outputs.

I am doing the board now using PCB123 - actually got the first
full layout last nite. It's not as easy as it sounds, there are
almost 600 nets on the board. The board is 6" x 8" and it
has all the circuitry on it plus areas to cut out so the PIC and
the displays can be remotely mounted. I use headers for
and terminal blocks for all the IO.

I could make it avialable to known DIY'ers.

I'll post when it's done.

[Henry Pootel]

Here's a balanced 6 channel, relay-based volume control that uses a micro-controller for my BOSOZ. It's not done yet, so don't start thinking that it actually works!

[promitheus]

Hey that looks cool!
It looks like those multilayer rotary switches.