electronics
DIY: UPS
March break has found me a project! Here is a little background. My friend’s dad gave me an old Uninterruptable Power Supply (UPS) he had at home, but that the battery was no good. I have plenty of batteries, so this was a non-issue. The UPS was a godsend because that same day I had gone shopping for one, but not found one suitable for the server.
When I took this used UPS home, and hooked up all the batteries in my arsenal, I discovered that it was too weak to power the server for more than 2 seconds. Bummer. Even for power flickers that was not suitable, as there is a 5 second delay after the power returns before it switches back to mains power. What to do, what to do…
Oh, I know. Make my own!
Update: My testing proceedures blocked me from finding one critical fault with the design. As you will notice, I am using a resistor in order to short the capacitor from the AC-DC adapter, in order to more quickly de-energize the relays. Unfortunately, it still isn’t fast enough. My testing involved simply unplugging the adapter, and checking for any flickering in the devices. However, this testing does not remove mains power. Thus, the slight lag time for switch over does not affect the device, as it is has power on both relay positions. However, in a real situation, the power fails, both on input power and the adapter, and I’ve tested that my switch over time in this case is too great for most devices.
Fix to come…
Home Device Repair
Hello again, it has been a little bit. College has picked up, and as I am moving in a little over a week, most of my projects have been packed. However, I’ve worked on a few things in the past little while.
Remember my half-repaired LCD monitor? Well recently I obtained yet another defective LCD monitor. Symptoms: no power, no lights, no noise. I may or may not post photos about this one, because I did all repairs without taking photos, and it was a pain to take it apart, and I wish not to do so again, hehe. Basically, the cause was 4 blown caps in on the circuit board, which I’ve replaced and it now functions fully, aside from a little squealing when in stand-by or turned off (I believe due to a capacitor that started blowing but that I measured to be within proper values.)
A few months ago, however, I did document a repair project I undertook. I have two home theatre amps at home that I’ve had problems with. At one point, both had stopped functioning properly. So, naturally, I decided to set to fixing them.
DIY Multimeter: Complete!
As mentioned in a previous posting, for Christmas, I received an Assemble-it-yourself Digital Multimeter Kit. Awesome. So, for the last week or two I’ve been building it, section at a time, till tonight, where I found myself in need of doing a calming activity. What is more calming then sitting down and soldering for 2 hours, while listening to Paramore’s discography using my DIY FM Transmitter to broadcast to my DIY AM/FM Radio?
Anyway… This is what it looks like, finished:
Sorry about the Mr. Blurrycam shot. Darn flash. I’ll have a clearer shot after the break, along with more details on the functions.
Video Blog: Oscilloscope
Alright, my second video installment. Enjoy the consistent, awkward style of yours truly!
Gorgar: Photos
All photos about Gorgar. If there is anyone out there who is into pinball machines, who has any questions, feel free to leave them in the comments!
Yes, the next two are photos from another post, but there are new ones after the break!
Winter Break: Projects
Over the break I’ve got a few projects on the go. Whether I finish any/all is another story, but at least, I don’t have an excuse if I find myself bored. I hope that all of your Christmases were enjoyable. My mom got me the following, which I had mentioned I wanted not too long ago:
A wire tracker. Perfect for checking phones lines, network cables, car wiring, coax cabling, and, most importantly, following wiring in pinball machines!
There are giant harnesses of wires in pinball machines that make it very difficult to track individual wires. This will make it so much easier for me to track where they go, rather than dealing with the two-colour wire coding system.
Another neat tool I got for Christmas was the following. Can you guess what it is (after the jump)?
Gorgar: Speaks.
The opening lines of this pinball machine. And now, my father, running out of room to store new (old) pinball machines, has let me take this one home to work on as my own project. Thanks, Dad!
As promised, here is a picture of the actual machine, and not some picture from the Intertubes. Again, it’s missing the backglass, but it is still awesome. The play field is interesting, it’s not empty, and it’s in good shape, too!
Scary. One of the feature I find the most interesting about it is the electro-magnet at the top left. The “snake pit”. The ball gets caught for a bit, then gets let go of and rolls down. I’m really hoping that I can fix this machine up, maybe it is something as simple as dirty contacts (after all, it is over 25 years old, and antique, if you will). Here is a video of me playing it. Not a great angle at the beginning, but you can hear the sounds of the game. One of the first electronic pinball machines, with electronic sounds. Before, all the machines used bells!
Note: Sorry for the, ahem, shitty video. Using Windows 7, I no longer have the well designed, fully functional, and advanced Windows Movie Maker found in Windows XP, as such, I have no control over export options, and the transitions and titles are all different (and quite frankly, nowhere near as good).
Server upgrades, exams
Hello all! This evening I upgraded the server a little bit. Last Saturday I ordered two 750GB drives, on sale for $69.97 at TigerDirect.ca, and tonight I set them up in mirrored RAID. Now there are five hard drives in the server: amazing. (By the way, for those who don’t know why the hell I’d do this, the server is my back up device, so I can access my files from anywhere, and in case drive failure occurs on my already RAIDed desktop. As well, I store all my media on the server to share within the whole house.)
I’m only waiting for the power supply to die, but Thermaltake power supplies are incredible: they don’t die. This one is rated for 420 watts, and the one in my desktop is rated for 430 watts, and for my desktop, I’ve got three hard drives, two optical drives, and a 9800GT graphics card. Anyway, enough product placement, here are the innards of the server:
Awesome. So now there are: two 750GBs, a 200GB, a 320GB, and finally, a 20GB Quantum Fireball, which has Windows installed on it, along with all software. Amazing. This drive has got to be about 9 or 10 years old, but I don’t see it dying any time soon, and its running 24/7. They don’t make ’em like they used to. Here is a last beauty shot:
Now, as for exams. They begin for me next week, on Thursday. Wednesday is a day off, a “study day”. My last exam is December 17th, after which I get exactly a month off, from the 18th of December to the 18th of January. 🙂
In terms of class projects, I have only had one since the last posts: the AM/FM radio. I’ve finished mine, and I plan on providing a detailed overview of it quite soon. I should cover the phone as well. Perhaps over the break I shall! Here again is a shot of the radio. Expect an update soon!
Pinball Machine: Post #1
Well, my dad has recently become a pinball machine collector. In August, he bought his first machine, Riviera, and soon, he had acquired 4 more machines. Most recently, he acquired his first electronic pinball machine, Gorgar, by Williams, based in Chicago. Here is a brief description: released December of 1979, 14,000 units were made, it has a jungle theme to it, with a heartbeat sound in the background that speeds up as game-play intensifies. It looks to me like it will be a LOT of fun once we get it working properly.
The machine mostly works, the lights all flash, points are counted, the ball is served (one set of solenoids isn’t working right now, that bring up the GAR letter targets), however it doesn’t allow you to play more than one player (it is a four player game), and it doesn’t stop at 5 balls: you get infinite plays. › Continue reading
Video Blog: Mini Amp!
Hey all, today I was given a special gift (well, I paid $24, but it was a gift nonetheless): a microphone pre-amp circuit (with mic integrated) AND a 0.5 Watt Mini Amplifier! Wow. I built both of them during class, it took about 1h30min to do both, and test. They are so awesome, the amp especially, so I made a video.
My first attempt at video blogging. Unscripted, edited to remove screw ups. Oh, technology… In any case, the mini amp is friggen’ awesome! A very simple design, aside from the IC, and the mic pre-amp is even simpler. I’m not sure if I am allowed to post this or not (if its copyrighted, let me know and I’ll take them down), but I’ve scanned the schematics in case anyone was interested in building their own. Of course, those two links are direct links to the inexpensive kits, so if you don’t feel like looking for the parts, you can order the kit with all the parts.
I was really quite impressed with how powerful the amplifier was. It is strong enough to drive my two-way, dual 6″ sub, floor-standing speakers, and create enough bass to feel in my pant legs and vibrate on my desk, equivalent to the volume I’m listening to music with my home theater amp right now. My predictions earlier at school were right: it would be equivalent to normal listening volumes. According to the equalizer display on my amp, it says about 0.1watts are going to the speakers right now. Now, I should be able to overtake any radio station with my FM transmitter!
😀