Circuits & Schematics: Volt - 4

31. Water Level Alarm
    Circuits Domestic
    .. 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

32. Digital Mains Voltage Indicator
    Circuits Domestic Measurement
    .. is not affected even when the mains voltage falls as low as 50V or goes as high as 280V. During Lab testing regulated 12-volt supply for circuit operation was used.)
    Jul 24, 2009

33. 13W Integrated CFL using IR53H420
    Circuits Light International Rectifier IR53H420
    .. The circuit is centered around the IR53H420 Ballast Driver Hybrid which contains the IR2153 Ballast Driver IC and two 500 volt size 2 HEXFET’s in a half bridge configuration. With a 120 volt AC line input (AC1-N), the voltage is ...
    Oct 2, 2009
34. How I Built a Wind Generator in My Backyard for $150. Part 2.
    Circuits Wind Energy Supply
    .. at 325 RPM, making it excellent as an electricity generator. However, pretty much any permanent magnet motor with a good volt/RPM ratio will do. Keep in mind that if you want to generate useful electricity, you will need to produce at ...
    Oct 19, 2009
35. How I home-built an electricity producing Wind turbine. Part 1
    Circuits Wind Energy
    .. tape drives). The best apparently are a couple of models of motor made by Ametek. The best motor made by Ametek is a 99 volt DC motor that works great as a generator. Unfortunately, they are almost impossible to locate these days. There ...
    Oct 26, 2009
36. How I home-built an electricity producing Wind turbine. Part 2
    Circuits Wind Energy
    .. managed to score one of the good 30 volt Ametek motors off of Ebay . for only $26. They don't go that cheap these days. People are catching on to the fact ...
    Nov 2, 2009
37. Supply Voltage Indicator
    Circuits Supply
    .. a similar manner, but many do. BC337-40 can start oscillations at a relatively low voltage, other types generally require a volt or two more. If experimenting, be careful not to punch a hole through the device under test: they oscillate at ...
    Dec 15, 2009
38. Neon Desklamp
    Circuits Domestic Light
    .. This circuit will power a 6 inch 4 Watt fluorescent tube off a 12 Volt supply, consuming 300 mA. It may also be powered by a suitably rated universal AC/DC adapter. Advantages of the ...
    Nov 5, 2008
39. Short Range Hand Wave Detector
    Circuits Domestic LMC7211 LM358
    .. FET, which can turn on a beeper or activate a relay. If a low power voltage comparator is used, such as the LMC7211 , a 9 volt battery will power the circuit for many years. The more popular LM358 would also work but would draw more ...
    Mar 31, 2009
40. Easy To Build Stepper Controller from Recycled Materials
    Circuits Power Digital
    .. 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 ...
    May 7, 2009

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