Breadboard jumper wire reference

Used an Adafruit Perma-Proto board to make this reference guide for the breadboard jumper wires I’ve acquired recently.

Jumper wire reference
Jumper wire reference

The bottom one has wires from sets that I bought before my local Radio Shack stores closed, and the top ones are from the 700 piece kit from Sparkfun. Since they each used different colours for the various lengths, I thought it would be useful to have a reference guide for what length each colour was.

Bench power supply

A Sparkfun bench top power board kit let me take a 300 W power supply salvaged from a dead computer and use it as a bench power supply.

It’s a handy little kit that takes the power supply motherboard connection and breaks out the +12V, -12V, 5V and 3.3V DC to fused 5 way binding posts.

Sparkfun bench power supply kit
Sparkfun bench power supply kit
Computer power supply
Computer power supply

According to the label on the power supply, it can source 17A at +12V, 0.2A at -12V, 19A at 3.3V, and 15A at 5V. That should be more than enough for any projects I’ll run off it.

I also picked up a few of these simple little 3-digit voltmeters that I’ll connect across the outputs to show the voltages.

Next will be to figureĀ  out an enclosure to contain everything.

Resurrected power supply

A couple years ago, the power supply in my computer went belly up because the power switch had corroded and stopped being a switch.

No idea what caused it to become so badly corroded, but I finally got around to finding a new switch for it. The new switch fit perfectly into the opening, and getting it reconnected was a pretty simple job.

Now I’ve got a couple of power supplies to work with. Plenty of projects out on the web describing how to turn computer power supplies into useful bench power supplies, and I could definitely use a couple of those on the workbench.

Phantom volume

The TV started doing this strange thing where the volume would turn down all by itself. Even after turning the volume back up, it would go back down again all by itself. TV works fine after several hours of watching, but then the volume on-screen display (OSD) will pop up randomly and sometimes the volume will change. After a while, the volume OSD pops up with increasing frequency, and the volume drops more and more until eventually it’s doing it all the time.

Ruled out the remote sending out random signals to the TV. Even took the batteries out to guarantee the remote wasn’t doing anything.

The control buttons on the side of the TV are capacitive touch buttons, so I thought maybe those had gone screwy. Opened upĀ  the TV and disconnected the control buttons, but it ended up having no effect. Still ended up with the same behaviour after a few hours of the TV being on.

TV innards
TV innards
TV power supply board
TV power supply board
TV control board
TV control board

At this point, I figure the problem is probably something heat related since the phantom volume changes don’t start happening until the TV’s been on a while. I’m not sure where else to go digging for the problem.

Looks like replacement control boards can be obtained from various sources for not a whole lot of money (definitely less than replacing the TV). Swapping out the control board would probably take care of the problem, unless of course the problem lies elsewhere.