Circuits & Schematics: -Wire Barometer 5/10 Volt Design vrs - 5

41. Active Antenna for AM, FM, SW
    Circuits Radio
    .. can be used for AM, FM, and Shortwave(SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. It is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive ...
    .. A 470 uH coil works on lower frequencies and lie in AM, for shortwave try a 20 uH coil. This unit can be powered by a 9 volt alkaline battery. If a power supply is used, bypass the power supply with a 0.04 uF capacitor to prevent noise ...
    Feb 10, 2007

42. DIY Juice Pouch - Extended Instructions
    Circuits Solar Cellular 78M05
    .. Salvaged Plastic Project Box Clear Vinyl Sheet (craft store; 50¢) Large Eyelet Kit (craft store; $2.45) Clips Wire NOTE: There are four distinct subassemblies which constitute our eBag: (1) modified messenger bag, (2) ...
    .. batteries are the scourge of cellphone jockeys and iPod people everywhere. But you can avoid volt loss by charging your gadgets while you carry them. Just equip an old messenger bag with a lightweight, ...
    Nov 16, 2007
43. The Polonium Pen
    Circuits Security Measurement
    .. difficult to build but the pen may be built in any number of ways as long as a couple of critical requirements are met. The wire probe sticking into the ion chamber must not touch anything that is ever-so-slightly conductive, not even most ...
    .. from the threading process! This isn't exactly the easy way to build such a pen but it gets the idea across. A tiny 10 A 9 Volt alkaline battery was installed and the threaded nylon bushing was tightened. A little clear epoxy fills the LED ...
    Nov 29, 2007
44. Uninterruptible Alarm Power Supply
    Circuits Security Supply Power
    .. the components, which are shown lying flat on the board, are actually mounted standing upright. The links are bare copper wire on the component side of the board. The heatsinks are folded strips of aluminium, about 2mm thick. Use a ...
    .. above whatever voltage is on pin 2. Since pin 2 is generally connected to ground - the 7805 is usually referred to as a 5-volt regulator. However, R1, C1 Z1 hold pin 2 at 9v1. Therefore the output at pin 3 will be ( 9v1 + 5 = 14v1 ). ...
    Mar 24, 2008
45. Magnetic Levitation Project
    Circuits Allegro UGN3503U
    .. coil to switch back on again, effectively keeping the magnet in levitation. I wound a small coil with 0.45 mm enamel copper wire (Figure 2), over all size and number of turns is not over important, but the resistance needs to be high enough ...
    .. resistance needs to be high enough to not exceed the power supply current limit. I wanted to stay below 0.5 amp with a 5 volt supply (5 / 0.5 = 10 ohms) and targeted 10 to 15 ohm coil. Figure 2. Electromagnetic coil. As the circuit has now ...
    Oct 21, 2016
46. Easy To Build Stepper Controller from Recycled Materials
    Circuits Power Digital
    .. scanner: 1 stepper motor 1 ULN2003 chip 2 steel rods For the enclosure: 1 cardboard box The tools: Hot glue gun and glue Wire cutters/strippers Scissors Soldering tools Paint For the controller 1 DB25 port (recycled from previous project) ...
    .. my impact on the planet. Also, because this controller is so simple, it only needs one power suply, so, it only needs 1 12 Volt (for both the logic and the motors), instead of 1 5 Volt (for the logic) and 1 12 Volt (for the motors). This ...
    .. amount of movment. This Concludes my instructable. I hope you found it interesting and helpful. Feel free to modify my design and let me know how it turned out. If you liked my instructable, please vote for it in the Epilog Laser ...
    May 7, 2009
47. Digital Capacitance Meter
    Circuits Measurement Microcontrollers Usage
    .. socket. It can hold most leaded capacitors and chip capacitors. Probing mechanism affects measureing precision, long wire should not be used to attach a Cx as possible. To increase stability, a metal case or metal sheld like shown in ...
    .. do. However input voltage of near ground level is little difficult to use due to following reasons. * Voltage not drop to 0 volt. Capacitor voltage will not be discharged to zero volt. It require a time to discharge capacitor to sufficientaly ...
    May 25, 2009
48. Water Level Alarm
    Circuits Domestic
    .. probe I recommend the use of 8 way computer ribbon cable. The first two wires may be doubled and act as the common probe wire. Each subsequent wire may be cut to required length, if required a couple of millimeters of insulation may be ...
    .. maximum separation distance of the probes. Let me explain further. The circuit uses a 4050B CMOS hex buffer working on a 5 volt supply. All gates are biased off by the 10M resistors connected between ground and buffer input. The common probe ...
    Jun 15, 2009
49. Field Strength Meter for 2.4 Ghz Wireless LAN
    Circuits Antennas Wireless Measurement
    .. The yellow plastic cylinder is used to keep the antenna separation at 10mm. I cut a channel into the plastic to allow the wire to sit tight, and pushed some liquid nails into the hole to hold it. The bottom of the reflector loop is held to ...
    .. with another dolop of glue. The detail of the antenna plugged into my Voltmeter. Above is the antenna plugged into the Volt meter. It works pretty well, pointing it at the SUN also gets a reading! Point it at the microwave oven and it ...
    Jan 26, 2010
50. Long Range FM Transmitter
    Circuits Radio
    .. case. Shield the oscillator stage using an aluminum sheet. Coil winding details are given below: L1 - 4 turns of 20 SWG wire close wound over 8mm diameter plastic former. L2 - 2 turns of 24 SWG wire near top end of L1. (Note: No core ...
    .. is used as power control. For hum-free operation, operate the transmitter on a 12V rechargeable battery pack of 10 x 1.2-volt Ni-Cd cells. Transistor T2 must be mounted on a heat sink. Do not switch on the transmitter without a matching ...
    Oct 7, 2010

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