Circuits & Schematics: meter - 5

41. Versatile Digital Speedometer Uses Few Components
    Circuits Measurement Domestic
    .. display of a rotating object's speed in revolutions per minute or show elapsed distances when you use the device as a trip meter.
    Nov 14, 2007

42. Simple Lie Detector
    Circuits Medicine Security
    .. R2 1 5K Pot R3 1 1.5K 1/4W Resistor C1 1 1uF 16V Electrolytic Capacitor Q1 1 2N3565 NPN Transistor M1 1 0-1 mA Analog Meter MISC 1 Case, Wire, Electrodes (See Nots) Notes The electrodes can be alligator clips (although they can be ...
    Dec 8, 2007

43. XXI Century Sundial - Now for Arduino also
    Circuits Domestic Laser MCU Open-Source Platforms Microcontrollers Usage Arduino
    .. software can be modified to display different things like a voltage at an analog input of the micro making a LASER analog meter. Or to make something like a LASER chronulator. More of these circuits can be superimposed to display different ...
    Jun 10, 2009
44. Digital Circuit Introduction for Beginners and Bystanders
    Circuits Beginners Digital
    .. connections and one output connection. The signals that we apply to the inputs and can observe on outputs, with a test meter, have a special characteristic. The signals are always at one or the other of two voltage levels. To simplify ...
    Aug 4, 2007
45. 4 Tips to Extend Your Lithium Battery Life
    Circuits Supply
    .. your lithium battery periodically, for laptops this can be especially important. If you start to notice your battery meter is becoming more and more inaccurate, it may be time for some battery calibration. By allowing your lithium ...
    Nov 27, 2007
46. DIY LCD Backlight
    Circuits Light Beginners
    .. case you'll be able to use PWM signal to control brightness of LED. I've used similar technique to modify antique analogue meter for my next project.
    Jan 22, 2008
47. Indicator features expanded scale
    Circuits Analogue Design Measurement
    .. and estimating its average value after the process reaches steady state (Figure 1). In this situation, using an analog meter with marked red and green zones is preferable to using a digital or bar-graph LED display. Figure 1. It’s ...
    Oct 26, 2020
48. Hamster-Powered Night Light With Custom Low-RPM Alternator
    Circuits Wind Energy Supply
    .. way to figure this is to use a voltmeter. Connect one lead of the first coil to one lead of the second coil and set your meter for AC volts (remember to strip the insulation off first). Hold the second coil away from the alternator and ...
    Feb 29, 2008
49. Cheap Sensitive Radiation Detector
    Circuits Security Measurement
    .. sensitivity would be on the order of those survey meters you often see on eBay with scales from 0.5 to 500 r/hour. If the meter ever moves on one of these, you have a problem! They should probably be calibrated in hours left to live! I ...
    Apr 23, 2008
50. The Curious C-Beeper
    Circuits Measurement
    .. C-Beeper will become indispensable in virtually no time! Quickly match capacitors and trimmers. Forget the capacitance meter when matching parts from the parts bin or selecting a fixed value to replace a trimmer - the fingers as ...
    Nov 12, 2008

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