What were your electronic or electrical projects that you have done in the past?

[ghosthunter]

What were your noteworthy electronic or electrical projects that you have done in the past?

It could be last night or back in high school. Anything noteworthy you want to say about it?

[ghosthunter]

For me, back in high school (1985-1989)

-solar powered clock: made from salvaged solar cells, cheap digital clock, NiCd battery, volt meter, cardboard and styro. (later I submitted this as my high school physics project).

-potato powered clock: (actually powered by two kalamansi) using a ripped up disposable "D" cell battery for the zinc and copper, a salvaged capacitor and a cheap digital clock

-model hovercraft using a 12 volt adjustable voltage power supply, three toy motors, three toy propellers, some styrofoam board, length wires, cardboard and plastic sheets. I had a wired remote control to "drive" the hovercraft over the floor.

-home made granade: this took me two years to perfect the design since it was an on/off project of mine (kinda got me into trouble later though). I used two AAA battery with some steel strips. wires and a 4.5v bulb as trigger system for the explosive charge.

-electrolysis of water: not much except a 12v 10amp powersupply, a jar of water and some strips of metal as electrodes with two smaller bottles inside the jar as collection vessels for the gasses produced. Had a popping good time with burning hydrogen. hehehe

[Jun aka Pekto]

I can't recall HS and elementary projects that well. I do remember the potato-powered clock plus, I dabbled with one of those physics/experiments project for kids in a box when I was younger.

At present time, I'm in the progress of re-establishing a home-based weather station and eventually see if I can get WMO (World Meteorological Organization) accreditation. Plus, I have to see if the Homeowners Association will have a fit if I put a tower with weather sensors in the backyard.

I used to have a home-based weather station at our old house. Somehow, my sensors disappeared (I suspect the wife has something to do with it) when we moved here 4 years ago.

[jundogg]

i made my name appear on 7-segment LCDs. it's even flashing on and off powered by 12V supply.

sino po gusto umorder? hehe

[VtEC]

simple electrical project lang sa akin, i rewired the whole house of my oldies.

[StraightSix]

Back in high school I begged my classmate to finish my school project, a simple (non-regulated) power supply. I was that stupid. Things changed a bit after I got hooked on CB and Ham radio. During my Uni days I always opted out of group projects and go alone because what I wanted to do was of no interest to my classmates.

One project was a basic phone patch interface for radios. It allowed a radio user to make and take phone calls, as long as the radio has a touchtone. It consisted of a touchtone decoder with outputs going to a control board. Add a radio with separate transmitter and receiver frequencies (for full duplex), put it on top of a tall mountain - instant (limited) cellphone instead of a (more limited) cordless phone. Unfortunately, I didn't use it as there were commercial units with more features. I just wanted to pass the lab subject.

The other school project -on antennas and transmission lines, was a cross-polarized VHF yagi meant for satellite communications. Come testing time, it didn't make sense hauling all the additional gears to school (UHF radio, UHF antenna, the mount and Az-El rotator) so I cheated ... I had a sched with an American friend to come up on air and act as if he was in the US

Post-Uni, there's the packet modem for radio communications. The circuit was based on a discontued TI chip. It allowed people like me to enjoy e-mail and file exchanges before there were internet service providers in Baguio and before I had a phone line. But it was so sloooooow. The standards then were 300 and 1200 baud. At 300 baud I can actually read most lines of text scrolling in the screen

At about the same was a simple interface for weather fax that used a cheap OpAmp (LM741). It needed a wideband-FM receiver at abt 136-138 MHz to get signals directly from orbiting US weather satellites, with pictures transmitted in real time. Text with the description and forecast were taken from the US met station in Guam.

And as a "personal redemption" for my high school fiasco, the biggest regulated power supply I've made (which was for a friend) had a rating of 12v * 100 amperes, with the usual features such as thermal shutdown and overload protection. The custom-made transformer was so heavy it had to be put on a wheeled-cart, and the heatsinks for the pass-transistors were milled from 2 aluminum blocks about a meter long

[ghosthunter]

During college:

-photo-sensor switch / trigger
-IR sensor switch / trigger
-ultrasonic switch /trigger
-12volt DC to 220volt AC inverter
-12volt battery charger with auto cut-off
-simple wandering robot based on two photo-sensor circuits
-simple remote control (on/off) using IR sensor switch (turned on/off my floor fan)
-homemade UPS using the battery charger & inverter circuits (black outs were very bad during my college years)
-battery operated fans (with 8 hour battery life) - I was manufacturing these and selling them for a good profit for a few months.

[CVT]

i made my name appear on 7-segment LCDs. it's even flashing on and off powered by 12V supply.

sino po gusto umorder? hehe

It should be running from left to right and vv.... also, "red on black and vv"

Also, each of the displays should have various transitions... mosaic, clapper, closing/opening to left, closing/opening to right and fade in/ fade out... It can be done, bro.... You may want to improve your electronic project...

4505:vader:

[ghosthunter]

recent project: dummy I.E.D.

[ringostarr]

i successfully imaged the hard disks of all our business computers. from my dad's office to my brothers/sisters personal home computers.

pag tawag nila sa'kin, i can reintall their PC's via VPN sa dsl. tuwang-tuwa nga sila eh

pag nasa bahay naman nila ako, nagugulat sila 10 minutes lang na-reinstall ko na their entire harddrive with MS office, Photoshop and other software they use by just using an USB Flash disk.

====

my next project will be this. dad is planning to buy a 42" plasma tv in the living room.

siguro after buying that sorpresahin ko sya, I'll put an XPC with wireless keyboard and mouse sa sofa so that he can have the option to surf using the 42" if he gets tired of watching tv/dvd. i will equip the xpc with a remote so that he can remotely operate the xpc. then I'll connect the xpc wirelessly sa home network namin so that he can use the printers and scanners in the other room pag may i-scan and print sya. i just found out na puwede pa i-share scanner over the network.

then maglalagay ako ng wireless surveillance camera sa house na puwede niya imonitor thru the 42"