Neru💤
@gateta.systems
💾 Me gustan los ordenadores y hacer circuitos. ⌨️ Retrocomputing. ❤️ @kd0082.bsky.social.
Recapped and cleaned. Some SMD ICs resoldered.
February 8, 2026 at 5:18 PM
Recapped and cleaned. Some SMD ICs resoldered.
Analog board cleaned, dried, installed, and tested. It's now logic board turn.
February 8, 2026 at 2:22 PM
Analog board cleaned, dried, installed, and tested. It's now logic board turn.
I guess it was a bad solder joint somewhere.
February 7, 2026 at 8:40 PM
I guess it was a bad solder joint somewhere.
It's just a guess since I can't measure it, but I do observe VCC worsen if CP4 area is cold and improve if CP4 area is warm. Testing reveals CP4 shouldn't be the issue. Main resistors measure OK. Maybe something is stealing power from that winding (red), or maybe DP4 is not giving enough power.
February 7, 2026 at 3:29 PM
It's just a guess since I can't measure it, but I do observe VCC worsen if CP4 area is cold and improve if CP4 area is warm. Testing reveals CP4 shouldn't be the issue. Main resistors measure OK. Maybe something is stealing power from that winding (red), or maybe DP4 is not giving enough power.
RP1 only provides like 4mA which is not enough to maintain TDA4605 switching, VCC needs power from an additional source. The TDA4605 starts switching, generating the secondary voltages, and generating a second VCC source, which comes from here highlighted in yellow. I hope I'm understanding this OK.
February 7, 2026 at 3:29 PM
RP1 only provides like 4mA which is not enough to maintain TDA4605 switching, VCC needs power from an additional source. The TDA4605 starts switching, generating the secondary voltages, and generating a second VCC source, which comes from here highlighted in yellow. I hope I'm understanding this OK.
The capacitor for TDA4605 VCC is CP4 (47uF) but it doesn't seem to be the issue.
Unfortunately I can't peek at stuff on the primary side since its not referenced to ground.
If I understand the schematic correctly, VCC is generated from half mains via 22k resistor RP1 for the Start-up current.
Unfortunately I can't peek at stuff on the primary side since its not referenced to ground.
If I understand the schematic correctly, VCC is generated from half mains via 22k resistor RP1 for the Start-up current.
February 7, 2026 at 3:29 PM
The capacitor for TDA4605 VCC is CP4 (47uF) but it doesn't seem to be the issue.
Unfortunately I can't peek at stuff on the primary side since its not referenced to ground.
If I understand the schematic correctly, VCC is generated from half mains via 22k resistor RP1 for the Start-up current.
Unfortunately I can't peek at stuff on the primary side since its not referenced to ground.
If I understand the schematic correctly, VCC is generated from half mains via 22k resistor RP1 for the Start-up current.
Got a Macintosh Classic II this week that needs recapping due to most of them leaking and the smell of these is terrible. But I'm happy to restore old computers.
February 5, 2026 at 8:13 PM
Got a Macintosh Classic II this week that needs recapping due to most of them leaking and the smell of these is terrible. But I'm happy to restore old computers.
Huge *I have no idea what I'm doing* moment but it's fixed.
February 2, 2026 at 6:33 PM
Huge *I have no idea what I'm doing* moment but it's fixed.
The picture in the quoted post is before replacing, this one is after replacing them. They looked fine but when tested their capacitance was low and one of them had low resistance. They felt very light.
February 2, 2026 at 4:54 PM
The picture in the quoted post is before replacing, this one is after replacing them. They looked fine but when tested their capacitance was low and one of them had low resistance. They felt very light.
@kd0082.bsky.social burned some CDs for her Sega Saturn with a slim USB LG DVD-RW but the console had trouble reading them. I burned some with the 5.25" IDE LG DVD-RW from the Pentium II PC and they worked.
The console PSU also had bad capacitors which wasn't helping:
bsky.app/profile/gate...
The console PSU also had bad capacitors which wasn't helping:
bsky.app/profile/gate...
February 2, 2026 at 4:38 PM
@kd0082.bsky.social burned some CDs for her Sega Saturn with a slim USB LG DVD-RW but the console had trouble reading them. I burned some with the 5.25" IDE LG DVD-RW from the Pentium II PC and they worked.
The console PSU also had bad capacitors which wasn't helping:
bsky.app/profile/gate...
The console PSU also had bad capacitors which wasn't helping:
bsky.app/profile/gate...
Just the next day the magneto optical drive broke. I found a replacement online but I'm not sure how to print it. I'll try PLA+ with supports and PETG as support interface.
February 2, 2026 at 1:22 PM
Just the next day the magneto optical drive broke. I found a replacement online but I'm not sure how to print it. I'll try PLA+ with supports and PETG as support interface.
This weekend I made this. It's a pain getting files to old Macs since they only have a floppy drive (1.44 MB). I put an unused SCSI magneto optical drive I had in a 3D printed case to use with old Macintosh. The DB-25 to IDC-50 wiring was difficult. I installed System 7.1 on a MO and it even boots.
February 1, 2026 at 11:23 PM
This weekend I made this. It's a pain getting files to old Macs since they only have a floppy drive (1.44 MB). I put an unused SCSI magneto optical drive I had in a 3D printed case to use with old Macintosh. The DB-25 to IDC-50 wiring was difficult. I installed System 7.1 on a MO and it even boots.
To continue using it until a replacement gear arrived, I decided to remove the motor. The floppy was working again, just needing to manually eject the disk with a paper clip. The next day it stopped working, making some weird sounds, and disks weren't spinning at all.
January 28, 2026 at 10:23 AM
To continue using it until a replacement gear arrived, I decided to remove the motor. The floppy was working again, just needing to manually eject the disk with a paper clip. The next day it stopped working, making some weird sounds, and disks weren't spinning at all.
Last weekend the floppy drive from wife's LC III stopped ejecting disks. A gear in the eject motor broke (common). Since the motor is attached to the tray and the gears wouldn't move, it was not possible to continue using it as the mechanism was seized.
January 28, 2026 at 10:23 AM
Last weekend the floppy drive from wife's LC III stopped ejecting disks. A gear in the eject motor broke (common). Since the motor is attached to the tray and the gears wouldn't move, it was not possible to continue using it as the mechanism was seized.
Quería enseñarle este tipo de canario a waifu. Todo normal hasta ver la sugerencia.
January 27, 2026 at 9:16 PM
Quería enseñarle este tipo de canario a waifu. Todo normal hasta ver la sugerencia.
Me ha sorprendido la velocidad de bajada de Endfield
January 27, 2026 at 1:23 PM
Me ha sorprendido la velocidad de bajada de Endfield
Spent the weeked recapping and cleaning a Macintosh LC III and a Macintosh LC 475.
January 25, 2026 at 9:33 PM
Spent the weeked recapping and cleaning a Macintosh LC III and a Macintosh LC 475.
🗣️ Don’t 💡 forget to 📝 register your copy of
Word to get 🤑 free 🧑💻 product support,
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and lots of 📚 information, 🗞️ news, and
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Word to get 🤑 free 🧑💻 product support,
🫰💵 special prices on future 📦 updates,
and lots of 📚 information, 🗞️ news, and
other 💾 services from Microsoft®
January 19, 2026 at 10:24 AM
🗣️ Don’t 💡 forget to 📝 register your copy of
Word to get 🤑 free 🧑💻 product support,
🫰💵 special prices on future 📦 updates,
and lots of 📚 information, 🗞️ news, and
other 💾 services from Microsoft®
Word to get 🤑 free 🧑💻 product support,
🫰💵 special prices on future 📦 updates,
and lots of 📚 information, 🗞️ news, and
other 💾 services from Microsoft®
The circuit ended up just being the Tiny 2350 connected to ADB (+ SMD transistor with resistor). I might 3D print a case and put it there inside somehow (rectangular hole) to have an USB-C port for mouse and keyboard. USB-C to USB-A adapter + USB hub works, that's how we're using mouse + keyboard.
January 16, 2026 at 8:59 PM
The circuit ended up just being the Tiny 2350 connected to ADB (+ SMD transistor with resistor). I might 3D print a case and put it there inside somehow (rectangular hole) to have an USB-C port for mouse and keyboard. USB-C to USB-A adapter + USB hub works, that's how we're using mouse + keyboard.
He creado un conversor de USB a ADB (Apple Desktop Bus) para conectarle al Macintosh Classic teclado y ratón USB. Usa una Pimoroni Tiny 2350 (Pico 2) conversor USB-C a USB-A, y para el cable usé un S-Video que tiene el mismo conector. Hemos podido ver que tiene el disco duro original SCSI de 40 MB!
January 16, 2026 at 8:29 PM
He creado un conversor de USB a ADB (Apple Desktop Bus) para conectarle al Macintosh Classic teclado y ratón USB. Usa una Pimoroni Tiny 2350 (Pico 2) conversor USB-C a USB-A, y para el cable usé un S-Video que tiene el mismo conector. Hemos podido ver que tiene el disco duro original SCSI de 40 MB!
Pillamos uno de estos barato roto y lo arreglé como en 15 mins. Está chulo (aunque rip entretenimiento del finde). Intentaré hacer un conversor de USB a ADB con una Raspberry Pico para poder usarlo porque no tenemos teclado ni ratón ADB.
January 15, 2026 at 9:37 PM
Pillamos uno de estos barato roto y lo arreglé como en 15 mins. Está chulo (aunque rip entretenimiento del finde). Intentaré hacer un conversor de USB a ADB con una Raspberry Pico para poder usarlo porque no tenemos teclado ni ratón ADB.
Ahora que sé cómo hacerlo puedo entrar así a los PR del software que usa nuestro producto.
January 15, 2026 at 3:15 PM
Ahora que sé cómo hacerlo puedo entrar así a los PR del software que usa nuestro producto.