Dick Cappels has made a DIY LC meter. As usual he has provided full schematics and code so you can build your own.
“There must be half a dozen similar LC meters on the web. Why didn’t I just download one of them and use it? I suppose part of the answer is that I wanted to do some of it myself. As nice as these other projects are, I wanted to make an LC meter that others could copy and get working without very much trouble. That meant that “exotic” components need to be kept to a minimum, and to me, that means no relays or hard-to-find special switches. It also means that the complete design nees to be spelled out in sufficent detial to allow anybody with basic assembly skills to put it together and make it work.
This instrument requires two precision components: A precision capacitor and a […]
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Electronic Hacks, DIY Hacks, Complex Hacks |
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I have never seen this demonstration before. Water running through two small open cans into a larger metal collection container wired together to create 10,000 to 15,000 volts. Is it an accumulation of static electricity? If someone knows what is happening I would love to hear about it!
Via: Zedomax
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This power supply meter allows you to keep you eye on your load and voltage with a nice digital display without hooking up a bunch of separate meters. How many times have you hooked up a current meter to a project being constructed to see how much juice it’s pulling? Well with this display that second meter can be put to better use! Schematics and code is provided.
“This multimeter was designed to measure output voltage and current in a PSU, where the current sense shunt resistor is connected in series with load at the negative voltage rail. It needs only one supply voltage that can be acquired from main PSU. An additional function of the multimeter is that it can control (switch on and off) an electric fan used to cool the main heatsink. The power threshold at which the fan switches on can be adjusted using One Touch Button […]
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With some free samples from Maxim/Dallas you could build this on the cheap.
“I had a little bit of free time to work with the MAX3222 chips that Dallas Semi sent me. These have all of the features of the MAX232 (two TX and two RX channels) as well as shutdown and output enable. The best feature is that the chip can operate from 3.0V to 5.5V so it can be quite versatile in connecting both TTL and LVTTL devices via serial port. I ended up making a small board that has a female db9 connector and has the RX, TX and power leads for easy access.”
Thanks Nick.
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Electronic Hacks, DIY Hacks |
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With some free samples from Maxim/Dallas you could build this on the cheap.
“I had a little bit of free time to work with the MAX3222 chips that Dallas Semi sent me. These have all of the features of the MAX232 (two TX and two RX channels) as well as shutdown and output enable. The best feature is that the chip can operate from 3.0V to 5.5V so it can be quite versatile in connecting both TTL and LVTTL devices via serial port. I ended up making a small board that has a female db9 connector and has the RX, TX and power leads for easy access.”
Thanks Nick.
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Electronic Hacks, DIY Hacks |
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The EggLight is a high tech light. Inside that tiny egg like housing is a microcontroller that powers an LED. A simple code based touch sensor was designed to turn the light on. To see more projects by Proteus have a look at his site.
Video after the jump.
“This is a Bedside Night Light I’ve built for my girlfriend according to her valentine’s specifications (hahaha I’m NOT kidding):
+It had to be small
+Portable soft lighting for “stealth home navigation” at night
+It had to be COOL !
The Design:
ping-pong ball + generic_product_cap + capacitive_sensor_made_with_a_pic = EggLight !
The Capacitive touch sensor itself is nothing more than… CODE =D (and some resistors)
You see, each Pin (well most of them anyway) in the PIC microcontroller can be programmed during runtime to be INPUT, OUTPUT(HIGH or LOW) or just to be FLOATING on a tri-state condition…
What you need to do is (look at the schematics so you’ll understand)
+Put […]
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You will have to put aside 5 or 6 hours to understand this project! Good thing is that it comes with a 115 page manual! I would bet that David is the first to publish plans for a DIY Laser Beam Analyzer.
“The laser beam spot is the tool in laser welding cutting. Industrial lasers are really great, but there’s a huge problem when it comes to knowing the state of your tool. I mean, in a normal milling machine the mill bit can visually be examined to see if a part of the edge is chipped off. But how does your beam spot look? How is your beam quality? You might have pretty good idea of how good the beam quality is but the truth is: You don’t know. You can’t just look at the laser beam an tell. First of all trying to look at a laser beam without […]
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Keith Wakeham, an engineering student replaced the backlight of a LCD monitor to operate using LED lighting.
“My very wonderful cousin gave me an old 17″ LCD made by the company GEM (I don’t know who they are) which was making a big racket with squealing. I knew it was the backlight so I said I’d take it knowing that to get it repaired by a pro would cost 30-60 for the inverter and a few hours of labour. Being A poor student that wasn’t going to happen but I knew it was a decent panel and wanted a second monitor for my laptop.
So I decided to see if I could drive the existing CCFL’s with a Computer UV CCFL kit and barring that would try LED’s (Which are salvaged from Princess Auto Head Lamps).”
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If you are wanting to make circuit boards using the UV exposure method you may want to recycle an old scanner into your UV light source.
“I opted for 3 tubes (around 8 Euro each), with ballasts and starters (6/7 Euro for each set). The switch, fuse holder and mains socket I scavenged from somewhere.
For the bottom plane I used a tin sheet. This acts as a sort of mirror/diffuser for UVs.
I used also some scrap aluminum bars from kitchen furnitures, their colour in the pictures tell it. Spacers and screws as required.
Now, the pictures show the electric diagram and the interior of the UV bed.
The circuit is based on three TL5 8W wood light tubes. Each tube is powered by its own ballast and starter . The number of tubes can be increased at will. The circuit is provided with a safety fuse and a power switch. A power socket […]
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If you have a FON router this hack will give you access to the serial console.
“Out of the box the foneros wireless router has Telnet and SSH turned off. By accessing the buit in serial console you can turn SSH on and access various settings and reflash the firmware.”
Via: Gizmodo
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Electronic Hacks, DIY Hacks, Computer Hacks |
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This instructable shows how to build your own RF probe. The parts needed might already be in your parts bin!
“Probe for measuring in the Radio Frequency range built inside an earphone jack, designed to have minimum capacitance and complete shielding.
What is needed:
A diode. Germanium point contact, OA79 or 1N34 is the preferred and traditional choice. But a modern substitute will be a schottky (gold bonded) diode. These have a low forward voltage, below 250 millivolts or so, versus the 600 or so of the silicon diode.
A few capacitors, chip type, value not critical, around 1 nf to 100 nf. (or 1000 pf to 0.1 microfarad)
One resistor, 1 Megohm.
One stereo earphone jack.
One pin from a turned pin IC socket. This forms the ‘hot’ end of the probe, so that various pins can be inserted for probing. A short piece from a needle for exploratory work. A piece of wire soldered […]
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Ever wonder how induction heating worked? Me too… Penguin Labs has an informative article about some of their experiments.
“Induction cookers, furnaces, stoves and all that jazz are now widely used. You put your metal saucepan on top of an innocent looking glass plate and it magically heats your food with no flame and almost no waste heat.
They are able to heat certain metals up to their melting points, and that is very hot, obviously…
How they work?
When an alternating electric current is passed through a coil, the coil creates a magnetic field. The magnetic lines of flux cut through the air around the coil. If a ferrous material, such a solid bar of iron is inserted into this coil, certain effects known as eddy currents are induced to flow in the metal bar. This causes localised heating, and ultimately heats up the metal bar.
A hexagonal screw in the red hot zone. […]
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This RF Remote Controller project is very well documented and even has a step by step explanation of what the PIC microcontroller code is doing line by line!
“On these pages, I will introduce Remote Controller with Radio Frequency. The electric wave sending-out is controlled with the code by PIC for transmission and the code is deciphered by PIC for receiving.
The 2 stages FET amplifier is used for the high frequency amplification. The FET amplifies only at the voltage to apply to gate (G). The resistor to be putting in the source (S) of the FET is to make the bias voltage of the gate. When making a resistance value big, voltage of the source goes up to the grounding and the bias voltage becomes big. In case of the gain of the amplifier is big, when the signal of the output returns to the input, an amplifier oscillates. In the […]
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Transform your old scanner that is just collecting dust in the closet into a cool tech lamp.
“This instructable shows you how to make a desk lamp out of scrounged scanner parts and a few extras from Home Depot. I have set up a small solar array, controller and a storage battery. I wanted to make some low power lighting that I can use in my office that would not consume a lot of power. I had a bunch of scanner parts lying around and decided to put them to good use.”
Thanks Joe P.
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Electronic Hacks, DIY Hacks, Computer Hacks |
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