Camble's GBZ

[GnobarEl]

Hi,

this is looking very good.

Witch wire did you use? (The yellow, white and black)
Did you have any issue with the sound? I'm using the same audio amplifier but I get a lot of noise from the speaker
Any suggestion?

Thanks.

[Camble]

Hi,

this is looking very good.

Witch wire did you use? (The yellow, white and black)
Did you have any issue with the sound? I'm using the same audio amplifier but I get a lot of noise from the speaker
Any suggestion?

Thanks.

Thanks The yellow and black is 22AWG for power. The white you see (along with red and more black for audio) is 24AWG. I haven't tested the speaker yet, but did get some noise when prototyping the PWM audio. A lot of people are using two filters, but I found that experimenting with different resistor values allowed me to eliminate the noise with just a single filter. It's not final yet, but try this low pass filter calculator and try some different values to cut off the audio at around 18KHz.

[GnobarEl]

Hi,

thanks for your reply. I using the same LCD as you, or at least one with a similar PCB. Can you share your config.txt file?

Thanks

[Camble]

I haven't finalised that yet but will post up what I can.

[Camble]

Coming along nicely so far. I'm waiting until I've re-whitened the replacement case before permanently fixing anything down.

My new layout means most of the boards are mounted in the rear half, not the front. The Powerboost is raised up so should help with cooling and prevent shorts. I'm hoping to replace the Teensy since it's becoming increasingly difficult to find a place for it.


A view without the LCD. Quite happy with this layout and both halves close together nicely.

[chiz]

Lookng great so far! I'm impressed how you cleanly desolered the micro USB connectors from the Pi Zero. Are you using any special tool or technique in removing surface-mounted components?

[Camble]

It looks cleaner than it is. They were a royal pain to remove. I just wedged my iron inside to heat up the entire port. Kinda removed the traces on the power port.

[skrapps914]

Lookng great so far! I'm impressed how you cleanly desolered the micro USB connectors from the Pi Zero. Are you using any special tool or technique in removing surface-mounted components?

i think if you get a sharp enough razor, you can wedge under it and razor the ports off.. and then remove any remaining solder and bits with a braid/wick.

i did this with my original gameboy board to remove the link port and other things

[Camble]

I've been struggling with a power solution to replace my Pololu switch for a few weeks now, and now finally have a working solution.



Here's the finished product.

The four pins, starting with the closest are:

• EN (PowerBoost)
• UART TX (GPIO14)
• Shutdown (GPIO27)
• GND (PowerBoost)

And here's the board in situe. Damn the thin insulation on those CAT5 cores!


This allows for clean shutdown of the Raspberry Pi, and the PowerBoost stays off when not in use.

[alien0matic]

Are you using the original GB switch? What about the code, I guess you aren't using the code from popcorns graceful shutdown?