Megadrum by Japi - Documentation / Pictures -

[japi]

Well, after checking that the resistors are ok, i decided to complete the building.

Its working!!!!!!!!!!!!!

Sadly the inputs pcb I made has the contacts for every input in the opposite leg as my jacks.. so i will need to short them with a wire or something. My jacks are switched type and disconnect that leg when you connect a jack.

Here are pictures of the build (14 and 15)
http://www.japiwebcam.com.ar/japi/megad ... /index.php

And a video of my son playing finger drumming
http://www.youtube.com/watch?v=qvXTxpQ9a_M

[japi]

Well, I guess not everything can be smooth, my lcd backlit is dead. I get 3.7v on pins 15 and 16 of the connector and the pins in the lcd but it won't come up. Shame.

[gastric]

Was working and now isnt? Or never worked? If the latter maybe you just need to adjust the trimpot?

[dmitri]

Was working and now isnt? Or never worked? If the latter maybe you just need to adjust the trimpot?

The trimpot, if you're still using it, is for adjusting contrast.

[japi]

Never worked in this board (it worked in the previous -dmitri schema-)
The contrast is ok, the BACKLIT is what isn't working

[Synthex]

The problem is that i'm building synthex's 2.5 and don't have schematics

Too be honest I would not be able to build anything without a schematic.

The shematic exists ! ...

[Synthex]

Never worked in this board (it worked in the previous -dmitri schema-)
The contrast is ok, the BACKLIT is what isn't working

Do you use a resistor ?

[japi]

The shematic exists ! ...

Is it posted? I've seen the schema for the 2.7 but couldn't find for the 2.5

Do you use a resistor ?

If you are asking for the trimpot removal, no, i didn't make that modification, I'm using the 10k trimpot

[Synthex]

Is it posted? I've seen the schema for the 2.7 but couldn't find for the 2.5

It's here : http://www.megadrum.info/forums/viewtopic.php?f=3&t=198&start=0&st=0&sk=t&sd=a#p2652

If you are asking for the trimpot removal, no, i didn't make that modification, I'm using the 10k trimpot

No. Do you use a resistor for the LCD backlight LED ?

[japi]

It's here : http://www.megadrum.info/forums/viewtopic.php?f=3&t=198&start=0&st=0&sk=t&sd=a#p2652

Thanks man!

No. Do you use a resistor for the LCD backlight LED ?

No, i think i don't. Should I ?