Analogue-sequencer

Happy new year all,hi Colin

As i 've built 2 p3,i find on a up step modes board,the leds are too much flashing...i took a look on the shematics,but i can  find the main resistor to replace it,for get down the voltage of the 8 leds (only on this board!) thanks and good luck with the Cirklon  Boop's

Hi boops, 

> As i 've built 2 p3,i find on a up step modes board,the leds 
> are too much flashing...i took a look on the shematics,but i 
> can  find the main resistor to replace it,for get down the 
> voltage of the 8 leds (only on this board!) thanks and good 
> luck with the Cirklon  Boop's

If you change the resistor values on the mainboard for the LED matrix
columns, you will lower the brightness of all the LEDs on the panel.
The best way to reduce the brightness of just that group of LEDs is to cut
the PCB track at each LED and add a series resistor into the PCB track to
one of the LED legs.
Start on a single LED, and try a few different resistor values until you
find the brightness level you want, then use that value for the others.
Don't waste your time soldering in a set of 8 LEDs, and then deciding they
all need changed. 
You also might like to use a different value for the two different colours,
to match their levels better.
The extra resistor values will be in the 10s to low 100s of ohms, depending
on the particular LEDs you used to populate the board.
In one case I've had to use a 1.5k resistor to get a high-efficiency white
LED under control.

Best regards,
Colin Fraser
Sequentix Music Systems Ltd
http://www.sequentix.com

Thanks for tips ,Colin; which  is this resistor  on the mainboard for the LED matrix ? BEST REGARDS

> Thanks for tips ,Colin; which  is this resistor  on the 
> mainboard for the LED matrix ? BEST REGARDS

There are 8 resistors between U12 (74HC241) and the socket that connects to
the switchboard.
Those resistors set the current for all the LEDs on the panel.
There should be 4 of 100R and 4 of 150R per the original BoM.


Best regards,
Colin Fraser
Sequentix Music Systems Ltd
http://www.sequentix.com

Hi i put a led resistor calculator (pdf) in the files section ;best regards Boop's




--- In analogue-sequencer@yahoogroups.com, "Colin f" <colin@...> wrote:

>
>  
> > Thanks for tips ,Colin; which  is this resistor  on the 
> > mainboard for the LED matrix ? BEST REGARDS
> 
> There are 8 resistors between U12 (74HC241) and the socket that connects to
> the switchboard.
> Those resistors set the current for all the LEDs on the panel.
> There should be 4 of 100R and 4 of 150R per the original BoM.
> 
> 
> Best regards,
> Colin Fraser
> Sequentix Music Systems Ltd
> http://www.sequentix.com
>

--- In analogue-sequencer@yahoogroups.com, "boops.secretvibes" <boops.secretvibes@...> wrote:

>the file is in DIY section;


> Hi i put a led resistor calculator (pdf) in the files section ;best regards Boop's
> 
> 
> 
> 
> --- In analogue-sequencer@yahoogroups.com, "Colin f" <colin@> wrote:
> >
> >  
> > > Thanks for tips ,Colin; which  is this resistor  on the 
> > > mainboard for the LED matrix ? BEST REGARDS
> > 
> > There are 8 resistors between U12 (74HC241) and the socket that connects to
> > the switchboard.
> > Those resistors set the current for all the LEDs on the panel.
> > There should be 4 of 100R and 4 of 150R per the original BoM.
> > 
> > 
> > Best regards,
> > Colin Fraser
> > Sequentix Music Systems Ltd
> > http://www.sequentix.com
> >
>