barber ltd

[kin0]

Hay. I want to build a barber ltd and get the trimmers of the bass/treble/presence outside the enclosure. The problem is there still would be a tone control (I want just the 3) what can i do?

[jacobyjd]

Are you sure you want to do that? AFAIK, the trimmers are there to modify how the tone control works, and aren't particularly useful when placed outside the box.

Otherwise, what's keeping you from wiring the tone control as a trimmer whilst running the 3 you want outside the box? If the hole spacing is too wide for a trimmer, why not move it to a daughter board?

[kin0]

Oh if you put it this way I think I'll leave them inside. Another question is what IC to use? (this is the schematic http://www.barberelectronics.com/Barber_Electronics_DIY.html). And the there I connect the middle pin of the trims?

[jacobyjd]

For the IC, any dual opamp should be fine (TL072, 4558, etc.).

Regarding the trimmers, I think you're misunderstanding the schematic a bit. Those trimmers are wired as variable resistors, meaning you only use 2 of the pins (the middle one and one of the outside ones).

[kin0]

Oh thanks : )

Another 4 questions.

1. There are pins of 9v+ and 4.5v. I understand the 9v+ but form where I get the 4.5?
2. For what is the small circuit that isn't connected to anything and which diode a use there?
3. In what form the values of the caps are writen (I mean uF/pF/nF)?
4. What is the numbering of the IC pins on this schematic?

[chi_boy]

MadBean has a nice layout for this project.  You could learn a lot from his project file, and probably save some aggravation by buying one of his boards.  His work is very nice and well worth the money (to me. YMMV)

[kin0]

Okay I took a look at that project and got everything except how not to use the led if I don't want one.

[Ice-9]

If you don't want to use the LED (i take t you mean a bypass/effect on/off indicator) Then just don't put one in the circuit.

[kin0]

kk thanks

[twabelljr]

Oh thanks : )

Another 4 questions.

1. There are pins of 9v+ and 4.5v. I understand the 9v+ but form where I get the 4.5?
2. For what is the small circuit that isn't connected to anything and which diode a use there?
3. In what form the values of the caps are writen (I mean uF/pF/nF)?
4. What is the numbering of the IC pins on this schematic?

(1)-The 4.5 volts comes from the circuit you ask about in question 2.
(2)-This circuit creates your bias votage, the 4.5v. Diode is for polarity protection, use an IN4001.
(3)-I believe all cap values are in uF except for the 100pF in the clipping section.
(4)-Each triangle is a section of a dual opamp. + is pin 3, - is pin 2, out is pin 1 and likewise + is pin 5, - is pin 6, and out is pin 7. Pins 8 and 4 not shown are +9v and ground.

Like jacobyjd said, you will have six potentiometers in this box (6 knobs), 3 wired as variable resistors, and 3 wired as voltage divders.