Circuits & Schematics: -Wire Barometer 5/10 Volt Design vrs - 2

11. Make your own Solar Bag
    Circuits Domestic Solar
    .. hardware shops: Sctoch double sided tape #668 from 3M around 2cm wide, vinyl tape to cover the solder points, around 1m two wire cable (we used the multi stranded type around 1mm in diameter each to have a soft feeling) and Textile glue. ...
    .. solar panel. The later was the way we choose. A solar panel. Our recommendation is the PowerFilm WeatherPro Solar panel 7.2 volt 200 mAh which costs $ 56.95 from Sundance Solar. This company was also the best in terms of service and quality ...
    .. this part of the project: A bag. Either you transform one of your bags or you look for a new one that looks cool and has a design that makes it easy to integrate a solar panel. The later was the way we choose. A solar panel. Our ...
    Nov 16, 2007

12. Rain Detector
    Circuits Automation Domestic Measurement
    .. is simply two conductors that are bridged by the rain water. A simple sensor is shown below. Two conductors of bare copper wire are woven through the holes so that the conductors are near each other but do not come into contact. Notice the ...
    .. close values are OK although the values shown are quite common. The 1 uF capacitor may be just about any type, with a 16 volt aluminum electrolytic being the most likely choice. The capacitor will see about 1/2 volt reverse bias at times ...
    .. cable is used to connect to the electronics. The sensor above will last a reasonable length of time but a more permanent design is shown below: Here it is after 18 months or so: It's still working fine but showing some signs of age. ...
    Nov 5, 2008
13. The Curious C-Beeper
    Circuits Measurement
    .. Battery Clip standard battery snap Battery 9 volt rectangular - Alkaline recommended Probe pin jack or similar with short wire probe Case Altoids mint tin or similar metal box The probe should be built into a metal box so that one hand ...
    .. 1 meg. in series with 470k) R6 39 k R7 33 k R8 100 ohm C1 0.047 uF (not critical) C2 30 pF (or more) trimmer C3 100 uF, 10 volt or more Q1 2N4403 (substitution risky) Q2 MPS-A18 (substitution probably won't work) Q3 MPS-A56 (sub may work - ...
    .. the beeper is properly adjusted it draws only 10 uA with nothing touching the probe - no power switch is required. This design is optimized for capacitors less than about 0.1 uF (100 nF). Large capacitors give a low frequency clicking ...
    Nov 12, 2008
14. How to Charge Any USB Device by Riding Your Bike
    Circuits Supply Domestic
    .. gets its energy from the interaction of the moving magnetic field of the magnet in the flashlight and the coil of wire wrapped around the tube the magnet slides through. The moving magnetic field causes electrons in the coil to move ...
    .. store and safely handle. Once the BOOSTCAP attains 1.2 volts, it has enough power to allow the MintyBoost to provide a 5 volt source for the device being charged. On the input wires we attached a 5A diode so that we don't get an ...
    .. Faraday flashlights do. However, we had a problem. To quote my team mate Nick Ciarelli, At first we considered using a design similar to one of those shake-up flashlights and converting it so that a runner could strap it on for a run ...
    May 25, 2009
15. Forced Quenching Improves Three-Transistor FM Tuner
    Lyle Williams
    Circuits Radio NXP BF245
    .. about 21 kHz. Figure 2. The tuner with forced quenching. The antenna coil is composed of five turns of space wound AWG 18 wire on a 1/4 form. The windings are spaced one wire-width apart, so you can close-wind two windings on the form and ...
    .. then remove one of them. When formed, the coil can be removed from the form. The coil is tapped one half turn from the 9 volt supply side to make a connection for the antenna. A one meter long wire antenna is sufficient. The 0.04 to 6 pF ...
    .. to children. But the basic one-transistor circuit shown in Figure 1 has drawbacks; a better circuit is the subject of this Design Idea. Figure 1. Self-quenched one-transistor super-regenerative FM tuner. The super-regenerative circuit is ...
    Oct 18, 2016
16. 0-1000 Volt Regulated High Voltage Power Supply
    Circuits High Voltage Supply Power
    .. regulator 78L05 , some NPN transistors and a pair of logic MOSFET IRF510 as a final amplifier. Click to enlarge 1000 Volt DC to DC Regulator Circuit The workings of high voltage DC to DC converter is the same principle as written in ...
    Dec 15, 2010
17. 1.3 Volt Power Source
    Circuits Supply
    .. and you will be working in a small space, typically less than the width of a battery or less than 10mm. Flexible stranded wire is the best to use here. Below is the finished view of my front panel adapter.
    Oct 4, 2010
18. Design Notes: 42 V 2.5 A Synchronous Step-Down Regulator with 2.5 μA Quiescent Current
    Circuits Supply Power Linear Technology LT8610 LT8611
    .. Technology Design Note 504 Introduction The LT8610 and LT8611 from Linear Technology are 42 V, 2.5 A synchronous step-down ...
    Sep 9, 2014
19. Optoisolators Compute Watts and Volt-Amperes
    Stephen Woodward
    Circuits Measurement Light
    .. on the dynamic conductance of optoisolators' junctions, simple optoisolator bridges compute the watts and volt-amperes of an ac load. A decade or so ago, I designed a simple circuit that included a quad optoisolator arranged ...
    .. of the copper compensates most of the temperature dependence of the LEDs’ conductances. The circuit in this Design Idea is an elaboration on that older circuit. It acquires not only watts, but also volt-amperes and so makes ...
    Apr 8, 2008
20. 12 Volt Off-line Buck Regulator on NCP107x
    Circuits Supply Power Application Notes ON Semiconductor NCP1071 NCP1075 NCP1077
    .. max rated load. Below 1% the output will rise to the value of the overvoltage clamping zener Z2 across the output. For a 12 volt output, a typical value for this zener will be 15 volts and at no load, the output will be clamped at this level. ...
    Design Note DN05058/D December 2013 This design note describes a very simple, low power, constant voltage output ...
    Jan 2, 2014

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