kjo

joined 1 year ago
sorted by: new top controversial old
Fuse replacement guide in c/askelectronics@discuss.tchncs.de
[–] kjo@discuss.tchncs.de 13 points 7 months ago

Crinkled/rolled metal foil, probably.

Apple fans are starting to return their Vision Pros in c/technology@lemmy.world
[–] kjo@discuss.tchncs.de 1 points 7 months ago

I just gotta say that's a really great comeback πŸ˜‚

33
A 74xx-defined Radio (acidbourbon.wordpress.com)
 

A shortwave radio receiver from scratch using only cheap and easily available components, i.e. standard transistors, op-amps and 74xx logic chips. No typical radio parts – no coils, no variable capacitors, no exotic diodes.

How should I get started? in c/askelectronics@discuss.tchncs.de
[–] kjo@discuss.tchncs.de 2 points 11 months ago* (last edited 11 months ago)

I agree with the Arduino approach for learning: try something that immediately gives feedback.

On a more concrete example you can start with Make: Electronics book by Charles Platt. PDF of the first edition (2009) is available from Makezine's own CDN. The book encourages learning by discovery. The leading text makes it clear:

Burn things out, mess things upβ€”that's how you learn.

17
Add Video Output Port and SATA Port to an Old Firewall (mastodon.social)
submitted 11 months ago* (last edited 11 months ago) by kjo@discuss.tchncs.de to c/electronics@discuss.tchncs.de
0 comments fedilink
 

Not my post/video. Link to mastodon.social post which then links to YouTube video.

Poster bought an old firewall hardware:

  1. saw unpopulated footprints on the circuit board,
  2. analyzed the chips,
  3. found the serial comm to access BIOS (blocked by password),
  4. dumped the SPI flash memory,
  5. obtained supervisor password,
  6. accessed the BIOS from serial comm,
  7. enabled the video display in BIOS,
  8. soldered the HDMI port,
  9. soldered the SATA power and data ports and the associated components,
  10. connected a SATA SSD,
  11. checked that the SSD is being recognized in BIOS,
  12. made modifications to firewall circuit board to mechanically secure the SSD, and to face plate to facilitate the HDMI port,
  13. installed FreeDOS and used it as a retro gaming PC.
2
JTAG 'Hacking' the Original Xbox in 2023 (blog.ret2.io)
 

Using Intel CPU JTAG to dump the secret bootrom in Microsoft's original Xbox. Disclaimer: not my blog.

1
Notes on USB PD Triggers (And ZY12PDN Instructions) (www.alexwhittemore.com)
 

Blog not mine. I'm just sharing.