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gbdev hw

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17 May 2022
@_discord_346672024648679445:t2bot.ioforple#2000 has anyone tried to make an alternative? 19:40:30
@_discord_487422814941347898:t2bot.iorondnelson99#5674 If you want to post your pics, there's a wiki page of bootlegs somewhere with pics of boards, with the intention of documenting which are reflashable. 19:40:45
@_discord_487422814941347898:t2bot.iorondnelson99#5674 I don't know of a straight replacement for Gekkio's site though. It would be cool if it was a part of gbdev.io but those guys have enough on their plate already 19:41:36
@_discord_487422814941347898:t2bot.iorondnelson99#5674 Imma try and find that wiki page 19:41:49
@_discord_487422814941347898:t2bot.iorondnelson99#5674 Ah, it's flashcartdb.com from InsideGadgets 19:43:36
@_discord_487422814941347898:t2bot.iorondnelson99#5674 * Ah, it's (flashcartdb.com) from InsideGadgets 19:43:50
@_discord_487422814941347898:t2bot.iorondnelson99#5674 * Ah, it's (flashcartdb.com] from InsideGadgets 19:43:59
@_discord_487422814941347898:t2bot.iorondnelson99#5674 * Ah, it's [flashcartdb.com] from InsideGadgets 19:44:07
@_discord_487422814941347898:t2bot.iorondnelson99#5674 * Ah, it's flashcartdb.com from InsideGadgets 19:44:13
@_discord_279252021465317376:t2bot.ioMotley#0454 changed their display name from Motley to Motley#0454.20:55:09
@_discord_258077424359571457:t2bot.ioBeatscribe joined the room.21:53:40
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18 May 2022
@_discord_196134614748758016:t2bot.io[Arg]Artifacks! joined the room.02:29:58
@_discord_196134614748758016:t2bot.io[Arg]Artifacks! Hi, anyone knows if i can use an LM7809 regulator on a DMG for a backlight led strip? I live on a shitty country and cant access to foreign products 02:29:58
@_discord_851527168000262166:t2bot.iolidnariq#1779 Probably not? The only power supply in a DMG that's higher than 9V is the -19V backlight bias, and it's unlikely capable of sourcing enough current to drive LEDs brightly enough 07:19:42
@_discord_851527168000262166:t2bot.iolidnariq#1779 Probably the best cheap plan is to use the 6V 4xAA batteries directly to drive the LEDs, and adjust the number of LEDs in series so that works 07:21:56
@_discord_236088176081371136:t2bot.ioOtesunki#9535 changed their display name from 2pi42n2c-u23prcnwueyboycbwqpwbun#9535 to Otesunki#9535.08:03:13
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@_discord_382273000554364949:t2bot.ionitro2k01#5984 Which country? 15:15:16
@_discord_196459713586528256:t2bot.ioPinoBatch In particular, is it Argentina where ax6 also lives? 15:22:15
@_discord_125279939531374593:t2bot.ioax6#0162 you can access foreign products here; they just tend to be expensive because of a weak currency and high tariffs 16:10:16
@_discord_851527168000262166:t2bot.iolidnariq#1779 * Probably not? The only power supply in a DMG that's higher than 9V is the -19V backlight LCD contrast bias, and it's unlikely capable of sourcing enough current to drive LEDs brightly enough 16:20:34
@billykin:matrix.org@billykin:matrix.org left the room.16:21:15
@_discord_224393245025763331:t2bot.ioBucket Mouse More audio testing
I switched the power supply of the attiny/neopixels to the 3.3V supply (linear regulator off of 5V rail). Still just as noisy. Adding diode didn't help.
Added a 5V boost to add some inductance in-line, and it barely made a difference.
Then I used a converter off of the battery supply to power the LEDs, and it helped a good amount. But at high volumes you can still kind of hear it. So not totally eliminated. I think because it's so low frequency, it's hard to filter out or prevent totally.
My next idea is to try a separate power supply specifically for the audio amp. I noticed the IPS screen introduces a background white noise, and while quiet, I'm interested to see if running the audio amp off a separate supply might squash that too
22:16:22
@_discord_224393245025763331:t2bot.ioBucket Mouse At this point I'm being nitpicky, because turning off the LEDs during gameplay makes it sound fine. The backlights are more for a display mode anyway 22:16:45
@_discord_224393245025763331:t2bot.ioBucket Mouse * More audio testing
I switched the power supply of the attiny/neopixels to the 3.3V supply (linear regulator off of 5V rail). Still just as noisy. Adding diode didn't help.
Added a 5V boost to add some inductance in-line, and it barely made a difference.
Then I used a converter off of the battery supply to power the LEDs, to keep the supplies separated as possible, and it helped a good amount. But at high volumes you can still kind of hear it. So not totally eliminated. I think because it's so low frequency, it's hard to filter out or prevent totally.
My next idea is to try a separate power supply specifically for the audio amp. I noticed the IPS screen introduces a background white noise, and while quiet, I'm interested to see if running the audio amp off a separate supply might squash that too
22:17:33
@_discord_224393245025763331:t2bot.ioBucket Mouse * More audio testing
I switched the power supply of the attiny/neopixels to the 3.3V supply (linear regulator off of 5V rail). Still just as noisy. Adding diode didn't help.
Added a 5V boost to add some inductance in-line, and it barely made a difference.
Then I used a converter off of the battery supply to power the LEDs, to keep the supplies separated as possible, and it helped a good amount. But at high volumes you can still kind of hear it. So not totally eliminated. I think because it's so low frequency, it's hard to filter out or prevent totally.
My next idea is to try a separate power supply specifically for the audio amp. I noticed the IPS screen introduces a background white noise, and while pretty quiet and not distracting especially just through the speaker, I'm interested to see if running the audio amp off a separate supply might squash that too
22:18:11
@_discord_224657293155893250:t2bot.ioFroggestSpirit As far as the audio generation goes, it's played at the CPU's native frequency, right? Not mixed down to something like 48khz? I had a thought of trying to emulate this in a raspberry pi pico, considering I got it to play some GBS files, but I figured trying to mimic the GB's hardware would probably sound better than software mixing at a lower sample rate 23:56:18
@_discord_224657293155893250:t2bot.ioFroggestSpirit It sounds like the rp2040 can do up to 32-bit DMA to peripherials, which sounds like it'd be more than enough to set the pins 23:57:15

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