High voltage supply (10-30kV) made from CRT television flyback transformer

Old CRT monitor or TV is a great source of electronic components that can be used in DYI constructions. One of them is a flyback transformer that can provide 10-30kV output. The input voltage can be in a range from a couple of volts to over a dozen of volts, power consumption is a couple of watts. In my construction input voltage is 9V, power consumption is 5W. A flyback transformer is driven by one or two ...

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Voltage indicator transitions between colours

This Design Idea gives two versions of an indicator light that changes from green to red as a battery discharges. There are many circuits that do this sort of thing, but all the ones I have seen are too complex and costly for my taste. This DI shows a method that uses an absolute minimum of low cost parts: a dual-color LED and four other parts. Figure 1 shows the simplest version. With 9V on B+ only the gre ...

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MOSFET-based Joule Thief steps up voltage

The output will be pulses of voltage that can be filtered using a diode and capacitor. As there is no regulation, the output voltage will vary with the input voltage or load. As this circuit uses a BJT, the supply voltage needs to be at least 0.7V to work, and with enhancement-mode MOSFETs, the supply voltage must usually be even higher. In this Design Idea, a low-threshold MOSFET (Q1) is used with coupled ...

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Analog Read Voltage using Arduino

This example shows you how to read an analog input on Pin 0, convert the values from analogRead() into voltage, and print it out to the serial monitor.  Circuit: image developed using Fritzing. For more circuit examples, see the Fritzing project page Connect the three wires from the potentiometer to your Arduino board. The first goes to ground from one of the outer pins of the potentiometer. The second goes ...

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LSF0204 breakout board: a bidirectional, multi-voltage level converter!

I needed a small, fast and reliable multi-voltage level translator (mainly for connecting ESP8266 boards to the Arduino, got tired of resistor networks pretty quickly) so I built a breakout board for TI’s LSF0204(D). Datasheet and info here. The LSF0204 is a nice little chip. It can translate up to 4 signals to and from the following values: 1.0 V ↔ 1.8/2.5/3.3/5 V. 1.2 V ↔ 1.8/2.5/3.3/5 V. 1.8 V ↔ 2.5/3.3/ ...

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Arduino-based AVR High Voltage Programmer

Update 01/02/09: A PCB version of this circuit is in the design stages – some preliminary information is here. Update 03/11/09: Kits based on this design are now for sale! Update 12/14/10: The original AVR HV Rescue Shield kit has been replaced by the new and improved HV Rescue Shield 2.  Visit the HV Rescue Shield 2 product page for information about the new kit!As I mentioned earlier this week, I recently ...

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How to build an Arduino energy monitor – measuring mains voltage and current

This guide details how to build a simple electricity energy monitor on that can be used to measure how much electrical energy you use in your home. It measures voltage with an AC to AC power adapter and current with a clip on CT sensor, making the setup quite safe as no high voltage work is needed. The energy monitor can calculate real power, apparent power, power factor, rms voltage, rms current. All the c ...

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How to build an Arduino energy monitor – measuring mains voltage and current arduino

Including voltage measurement via AC-AC voltage adapter and current measurement via a CT sensor. This guide details how to build a simple electricity energy monitor on that can be used to measure how much electrical energy you use in your home. It measures voltage with an AC to AC power adapter and current with a clip on CT sensor, making the setup quite safe as no high voltage work is needed. The energy mo ...

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How to build an Arduino energy monitor – measuring mains voltage and current

This guide details how to build a simple electricity energy monitor on that can be used to measure how much electrical energy you use in your home. It measures voltage with an AC to AC power adapter and current with a clip on CT sensor, making the setup quite safe as no high voltage work is needed. The energy monitor can calculate real power, apparent power, power factor, rms voltage, rms current. All the c ...

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Huge List of tutorials & Components based resources & info

 glossary A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A ACCELEROMETER: tutorial on using the Memsic 2125 accelerometer with Arduino/Freeduino ACCELEROMETER: another post on using the Memsic 2125 Rad*o Sha*k variant accelerometer with Arduino/Freeduino ACCELEROMETER: article on using the LIS3LV02DQ 3-axis accelerometer with Arduino/Freeduino ACCELEROMETER: an excellent article on using the ADXL330 wi ...

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