Analogue-sequencer

Thanks Colin

I found some info online about the negative voltage generator and read
through the spec sheets some more and realised all i had to do to
bypass the neg voltage generator was connect pins 15 & 16 from the P3
LCD connection to the A & K connectors that the lcd had on the side.
I just cut the two pins on the LCD adapter for pins 15& 16 so they
didnt connect to pins 15& 16 on the lcd and then ran some wires from
the pins on the LCD adapter to the A & K pads....worked great ;)
I'll post a pic of what i did in the group in case it might help some
others.

Thanks
Brett

--- In analogue-sequencer@yahoogroups.com, "Colin Fraser" <colin@...>
wrote:
>
> Looks to me from the datasheet like that part is much the same as
the ones I
> use.
> The backlight LEDs need a drive current rather than a voltage, but
that is
> achieved by putting a series resistor in the supply.
> You may need to calculate the right resistor value for the LEDs used.
> The parts I supply need 30mA, and have a voltage drop of about 3.5v,
so I
> use a 47 ohm resistor.
> The datasheet for your part gives a typical current of 40mA through
the LEDs
> at 3.5v drop, so you may want to use a slightly smaller resistor.
> 
> Best regards,
> Colin Fraser
> Sequentix Music Systems Ltd
> http://www.sequentix.com
> 
>  
> 
> > -----Original Message-----
> > From: analogue-sequencer@yahoogroups.com 
> > [mailto:analogue-sequencer@yahoogroups.com] On Behalf Of bambam4236
> > Sent: 07 November 2008 01:05
> > To: analogue-sequencer@yahoogroups.com
> > Subject: [analogue-sequencer] Re: Specs for replacement LCD 
> > needed urgently...Can't find anything definite.
> > 
> > I managed to find a blue display (better then what i found yesterday)
> > locally that seemed to fit the bill, it is a winstar WH1602A-TMI-JT 
> > 
> > Once i got it i realised it has a negative voltage generator onboard?
> > I asked the guy i bought them off about it and he replied :
> > 
> > "3V Power Supply means as the LCD generates Negative Voltage, it can
> > also run in 3V power supply.
> > 
> > You can use the 5.0V power supply follow the spec sheet as well. The
> > only difference is to connect the backlight, instead of using pin 15
> > and 16, u have to connect A&K Pin to get the backlight as Pin 15 and
> > 16 will perform as a negative voltage generator.
> > 
> > All the others connections will remain the same."
> > 
> > I'm a little confused here and was hoping someone might help, can i
> > wire this the same as the standard display colin supplied? Can i do
> > any damage to the P3 by using one of these?
> > 
> > I have boring old green lcd's that will be fine but would love to use
> > this blue one tonight if i can.
> > 
> > thanks
> > Brett
> > 
> > 
> > --- In analogue-sequencer@yahoogroups.com, "bambam4236" <bamsyn@>
> > wrote:
> > >
> > > Thanks heaps colin, i managed to find one locally in time for the
> > > weekend ;)
> > > 
> > > --- In analogue-sequencer@yahoogroups.com, "Colin Fraser" <colin@>
> > > wrote:
> > > >
> > > > As far as 16x2 displays go, there are only three or four 
> > variations
> > > on the
> > > > mounting point layout that I have seen, and anything non-HD44780
> > > compatible
> > > > is rare.
> > > > The LCD display I supply for the P3 is an EA W162B-NLW
> > > > Datasheet for the whole EA range is here:
> > > > http://www.electronic-assembly.de/deu/pdf/doma/blueline-w.pdf
> > > > You'll see they do a couple of different 16x2 form factors.
> > > > 
> > > > Best regards,
> > > > Colin Fraser
> > > > Sequentix Music Systems Ltd
> > > > http://www.sequentix.com
> > > > 
> > > > 
> > > > 
> > > > > -----Original Message-----
> > > > > From: analogue-sequencer@yahoogroups.com 
> > > > > [mailto:analogue-sequencer@yahoogroups.com] On Behalf 
> > Of bambam4236
> > > > > Sent: 05 November 2008 01:03
> > > > > To: analogue-sequencer@yahoogroups.com
> > > > > Subject: [analogue-sequencer] Specs for replacement LCD 
> > > > > needed urgently...Can't find anything definite.
> > > > > 
> > > > > Sorry if this has been spec'd before....i'm sure it has.
> > > > > 
> > > > > I've been searching previous messages and am having 
> > trouble finding
> > > > > actual specs of the replacement LCD people are using. I 
> > need my P3
> > > > > ready to go this saturday! so need to find a LCD locally.
> > > > > 
> > > > > I have the adapter board etc supplied by colin.
> > > > > 
> > > > > I assume the lcd is a HD44780 type? and i know its 16x2 but can
> > > > > someone give me a datasheet etc so i can make sure i get one
> > that fits
> > > > > physically and electronically?
> > > > > 
> > > > > Thanks
> > > > > Brett
> > > > > 
> > > > > 
> > > > > ------------------------------------
> > > > > 
> > > > > Yahoo! Groups Links
> > > > > 
> > > > > 
> > > > >
> > > >
> > >
> > 
> > 
> > 
> > ------------------------------------
> > 
> > Yahoo! Groups Links
> > 
> > 
> >
>