BOSOZ Preview

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After 1 year of work on and off, I've finally got my BOSOZ subassemblies/ circuit boards built and the chassis drilled, well most of it. Turns out my case was not big enough, but I managed to squeeze everything in. Here is where I am so far. Comments welcome, unless they relate to the proximity of everything to the transformers! This won't be finished for months but here is a preview.

BOSOZ

Transformers - 3
Power supplies - 4 all are fully regulated (L/R/Input stage/Relays).
Inputs - 2 bal, 2 unbal
LEDs- more than 15 incl. illuminated switches

[lgreen]

Yes, I actually mounted each high speed soft recovery diode in the rectifier on its own heatsink. I did this a year ago and it caused me a lot of trouble in terms of space used. I wouldn't do it again (in a preamp!), but you do get a nice line of sinks across the chassis.

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Lots of room for lights and lighted switches. It will have the same LEDs and Switches (but more) as my Gainclone.

You see that one input has a board, this is for a DRV134 differential driver which is powered by a low noise power supply as shown on my Gainclone post. One unbalanced input uses the DRV134 to convert SE to differential, the other uses the BOSOZ circuitry itself for this conversion. I wanted to try both, but it meant adding a 4th power supply.


As you can tell by the amount of mechanical items near the potentiometers, i'm doing something interesting with the L/R volume to get a balance control.

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Here is the couple to connect the L/R pots. There will be three external stainless steel gears behind the vol knobs to engage and disengage the L/R volume pots.

oooop, here it is.

[tobias_svensk]

Lookes like a very nice piece of bosoz!

Nice little volume thingie

/Tobias

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The volume thingie is going to be nice if it works.

[Variac]

Very impressive so far!
Where do I get some beautifully lableled panals like yours?

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The panels were done by

www.frontpanelexpress.com

You download their software, design your panel, and email it to them, the panel shows up in about 2 weeks, front/back are anodized, lettering is etched and ink-filled. You can send them your panel for drilling and labeling but after using them a few times, I would recommend against this. They do much better using their own stock panels.

Here is another panel, this one a 3mm thick panel from my gainclone.