Worklog Gman's Wii portable

[Gman]

Ok I can follow that one, makes sense to me now.

Also cheese, interesting how you used an npn on yours and used the transistor to switch the screen button. Good thinking. Hadn't thought of doing it that way.

 

[cheese]

I have a ton of npn transistors so they come to mind occasionally, I got them for a LED project I never finished ,-,

 

[Gman]

I have a ton of npn transistors so they come to mind occasionally, I got them for a LED project I never finished ,-,

oh yeah me too right there. I've collected every common resistor from 47ohms to 3M ohms, many different capacitors, and op-amps from the synthesizer I'm building. It's better than the radioshack parts cabinet.

 

[cheese]

My RadioShack is kinda sad, I'm legit the only one who buys their electronics stuff, and I'm slowly buying up all their stock... Soon China (and Japan or eBay) will be the only place I can get shit

 

[Gman]

The transistor sync mod is not functioning correctly. With no button press, it is at 3.3v, and with the button pressed it goes down to 1.7v. I am using a PN2907 transistor if that helps. I have not wired it up to the bluetooth module yet.

There are 3 resistors there, the 100k is hidden underneath the 10k attached to the base

 

[Aurelio]

First of all you swapped the collector and the emitter. Also I don't see the 100k resistor

 

[Gman]

First of all you swapped the collector and the emitter. Also I don't see the 100k resistor

I promise the 100k is there. It's underneath the 10k, nothing is shorting either. According to the radioshack baggie I have it wired in the correct direction, but I guess I could try swapping it either way and see what happens.

 

[Aurelio]

Mmm can you draw a schematic using directly a drawing of the transistor? Maybe I misunderstood your connections from the picture.

 

[Gman]

Mmm can you draw a schematic using directly a drawing of the transistor? Maybe I misunderstood your connections from the picture.

From left to right in the diagram. Collector, Base, Emitter. According to radioshack.

 

[Aurelio]

According to [URL='https://www.fairchildsemi.com/datasheets/MM/MMBT2907.pdf']this datasheet[/url] the order is EBC from left to right (according to your drawing point of view)

 

[Gman]

According to this datasheet the order is EBC from left to right (according to your drawing point of view)

Ahh I see now. The radioshack diagram says "Pin diagram viewed from bottom" damn you radioshack!!

 

[Aurelio]

Ahh I see now. The radioshack diagram says "Pin diagram viewed from bottom" damn you radioshack!!

I know how you feel Let me know if it works

 

[cheese]

"Pin diagram viewed from bottom" damn you radioshack!!

You don't even realize how many times that's gotten me so pissed at something that should've worked but didn't.

 

[Gman]

Swapped the transistor and now the test spot just stays at 3.3v whether the button is pressed or not.

 

[Aurelio]

Swapped the transistor and now the test spot just stays at 3.3v whether the button is pressed or not.

That's odd. Can you measure the base voltage both with the button pushed or not?

 

[Gman]

Interesting, from the tact switch, unpressed is .25v and pressed is 1.7v. Apparently it isnt ground! It's a black wire but its carrying voltage. Also the wire labeled Key on the screen is actually ground. I shouldve tested that before but I just assumed.

 

[cheese]

You must have gotten that from china!

 

[Aurelio]

Interesting, from the tact switch, unpressed is .25v and pressed is 1.7v. Apparently it isnt ground! It's a black wire but its carrying voltage. Also the wire labeled Key on the screen is actually ground. I shouldve tested that before but I just assumed.

.25V? It also looks like that pull-up resistor (the 100k one) is not connected to 3.3v...

 

[Gman]

Yes, .25v. It is connected to 3.3v, the wire just leads out of the picture to the controller board power.

 

[Aurelio]

Yes, .25v. It is connected to 3.3v, the wire just leads out of the picture to the controller board power.

So across the resistor there is like ~3V?