The Christmas is approaching by and have you prepared for it yet? For those that prefer to send the traditional X’mas greeting cards, instead of the online E-cards, you should spare a few hours for this sensational Edge-Lit Holiday Cards. If your friend always teasing you because of sending the old-fashioned analog X’mas Cards, this is the right time for you to blow them away with this DIY Edge-lit holiday cards. Although creating a glowing holiday card may not be the most economical for a mailing list of hundreds of people, but it’s one of a kind creation that remarkably cool and cheap DIY holiday creation. By simple taking an advantage of the properties of etched glass, you’ll be able to design greeting cards with glowing emblems on them! Well, you might need some sort of things to help you off in this project, such as LEDs, scraps of acrylic (etched glass), cardstock, black electrical tape, coin cell batteries and so on… Lastly, if you think that the LEDs and holiday cards are the perfect match made in heaven, and then what are you waiting for? Let kick-start the project right away!
Do you love to spray your graffiti at public walls, but scared to be caught in red handed? Well, why don’t create a DIY DOT Graffiti Painter and enjoy the fun of spraying as you wish? Firstly, we need to have these following materials: 8 12vDC direct acting 1/4″BSP solenoid valves 3 inflatable wheelbarrow style wheels Z4 Nuclear / Biological / Chemical test set box A PIC 16F876A Start the project with building a spray bar and back axle. You need to mount the three inflatable wheelbarrow style wheels on it. Then, you need to make the spray bar adjustable up and down. After it, mount all of the eight solenoid valves on an old PCI blanking plate and hung it over the spray bar. Add the Z4 Nuclear / Biological / Chemical test set box to spice up the effect of the project. This tool features with a push button, a three position rotory switch and a 12 position rotory switch. These features made the controlling process even easier.
Probably you saw Sun tracking system before; however do you have the urge to challenge yourself to make a Sun Tracking Unit? First of all, get a tiny .7″x1.4″ PC board using the LED3X sensor concept. This circuit uses power MOFSET drivers, which most any DC motor can be used without any modification. You might noticed that the power drivers are good enough of delivering about 50 amps of peak current or even more. The current will increase accordingly to the transistor. This mean the large power MOFSET, 72A when operated in low current, it will eliminates the needed for a heat sink on the transistor. Cool, isn’t it?
So this time I decided to make pretty simple but powerful enough audio amplifier. For this, I’ve chosen quad bridge car audio amplifier – TDA7384 which has four input and four output channels with power capability 4x35W(4Î©). If connect to car battery where operating voltage is about 13.2V, then each channel can give 22W what is more than enough for me. This amplifier I probably will use to test audio processor TDA7313 which is stilltry in the development phase. I didn’t find much information about this chip on the internet, so I decided to build it and try on my own. As datasheets of TDA,7384 says, it is low distortion, low output noise, low external component count. Also has Stand-By function and Mute function. It has several protections like from output short circuit to GND. or to Vs, capable of handling very inductive loads, thermal limiter, load dump voltage. TDA7384 is an AB power amplifier cased in flexiwatt25 (eagle library is included in project archive) package which is designed for high-end car radio applications. It allows rail to rail output voltage swing with no need of boot-strap capacitors. (click to enlarge) I have followed the schematic in datasheet when building…