triac

Obligatory Christmas Post

Alright, so it isn’t really obligatory. Merry Christmas to you, reader, and a happy new year to you as well. Next semester starts January 18th, 2010, so there should be plenty of new projects. In fact, we are apparently building a robot!

During the break, I should be getting around to photographing and making posts for all my projects this semester (that I’ve not yet covered).

Gorgar Relay Board

Oh, and as for Gorgar, I’ve located the triac responsible for the second drop-target solenoid not firing. (Notice to missing one above, 3rd row of triacs, 3rd triac in: right in the center!)

Triac

Now to locate a replacement. Shouldn’t be too hard. The way I located the defective triac was pretty awesome. I put the multimeter on continuity, and put one probe on the pin that triggers the malfunctioning solenoid, then, with the other probe, I touched the back-plate of all the triac, under the hopes that it was the pin attached to the back-plate (I assume ground, or perhaps the base, of the triac) would be the same pin that provides the power to the solenoid. Well, I was lucky, and found continuity between one of the triacs.

I checked on the intertubes for how to test a transistor/triac, and went about checking the hi-lo values on this one. Nothing. As a control group, I tested all the other triacs on the board, and all of those ones were fine, this was the only one that had no continuity anywhere. Safe to say, she has blown.

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Thursday, December 24th, 2009 life, pinball, projects No Comments

Piano, transistors

I’ve posted, on the Music page, a new song I started a few nights ago. A sad but hopeful piano song, that seems to pull you up and down. This is definitely a pre-release version, of course, but it’s there for all to enjoy!

I haven’t played much with the pinball machine since, however, I believe I know what the cause of the problem with the middle GAR drop-targets: because no power is coming from the board itself, I know it’s not a problem with wires between the board and the solenoid. On the board where it connect to, there are a whole bunch of transistors and triacs: relays. I’m 75% sure that these relays control lights and solenoids, so chances are good that one of the transistors are blown that are in charge of sending current to the solenoid. It’s just a matter of finding which one is it, and finding a suitable replacement part.

I’ve gone through my first MP3-player-to-tape-deck-adapter, which I knew would happen eventually. Luckily I’ve got a second one, but it has given me renewed desire to hack into my car’s stereo console and wire-up an Aux input. If only it weren’t so damned cold outside.
:P

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Sunday, December 13th, 2009 music, pinball, projects No Comments