Analogue-sequencer

--- In analogue-sequencer@yahoogroups.com, "Colin f" <colin@c...> 
wrote:
>
>  
> > I consulted with Colin a few weeks ago and legend has it that 
> > getting all blue LED"s on the P3 would be too difficult as 
> > the parts come standard.
> > 
> > I've modified TB-303 and TR-606's before in which all LED's 
> > were replaced with blue ones.  If there's enough demand, 
> > maybe we could get something going and maybe get the LED"s 
modified?
> 
> The issue with P3 is that the step LEDs are tri-colour - containing 
both a
> red and green LED element.
> I have no source for red/blue tri-colour LEDs so have to use RGB 
LEDs and
> only wire the red and blue elements.
> These LEDs are 10x the price of the standard tri-colour parts, so I 
don't
> want to keep them in stock.
> 
> However, since I've had a few more queries about it, I am going to 
offer a
> custom option of red/blue (and magenta) step LEDs for red/green 
colour-blind
> users.
> This will cost an extra 20 ukp.
> 

True.  I recently switched mine out for better visibility.  The RGB 
LEDs are more expensive (I think mine were $1.49 each or so), but for 
a single buyer, 16 LEDs is not much.  If Colin had to stock them as 
standard, that would be a lot of capital tied up in LEDs.

One other thing to note - I built a small test circuit to experiment 
with different resistor values.  the RGB LEDs I bought were way too 
bright using the stock resistor values in the P3.  It would be nice 
to be able to tailor that to some degree because I'm sure each user 
is different.  Based on the P3 design, I didn't think you could use a 
single trim pot as a variable resistance since it's grouped by fours 
plus you might want control over R and B separately.