UVTRON Flame Detektor, How it Works?

UVTron Tube and Driver Hamamatsu UVTron Flame Detector and driver circuit can detect the flame of a candle or cigarette butts in a distance of 5 meters. Usually it is used as a tool to detect the source of the fire that operate on the length of spectral 185 to 160 nm . Price of this sensor is not more than $ 95 USD. How it works ? UVTron tube works when the cathode is given ultraviolet signal. Photoelectron to be emitted from the cathode by photoelectric effect and accelerated to the anode using an electric field. When voltage is applied, the magnetic field increases, the greater the electric field and electron kinetic energy is also great to ionize the gas molecules in the tube to collide. Electrons generated by ionization are accelerated...

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PING Ultrasonic Distance Sensors and Applications

PING ultrasonic distance sensor is a sensor 40 kHz Parallax production is widely used for applications / robot contest. Advantages of this sensor is that only requires 1 signal (SIG), in addition to the 5V and ground lines. PING sensor detects the distance of objects by emitting ultrasonic waves (40kHz) during tBURST (200us), then detect the reflection. PING sensors emit ultrasonic waves according to the control of the controlling microcontroller (trigger pulse with the tOUT min 2us). This sensor specification is as follows: Measurement range of 3cm - 3m. Input trigger-positive TTL pulse, 2 us min., 5 us typical. Echo hold off 750 us from fall of trigger pulse. Delay before next measurement 200 us. Burst indicator LED displays the activity...

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Learn to Make USBasp is Easy

USB Downloader was made by Thomas Fischl. He used the the USB driver with  AVR that is being developed by Objective Development GmbH. USBasp consists of ATmega48 / 8 and a few passive components without requiring the other driver components. USBasp has several features such as: Can work on the Linux operating system, Mac OS X and Windows. Does not require a dedicated controller or SMD components. Programming speeds up 5Kbytes/sec. SCK option to support the target device with a low speed (<1.5 MHz) Here I will help you to create your own USBasp with yourself. Create a circuit USBasp as shown below with PCB software that you usually use. I use Eagle. (Click on the Picture to zoom in) After the circuit schematic completed ,  convert...

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Symmetric Power Supply +35V and -35V Project

A symmetric power supply is needed when we make project about amplifier. Like an amplifier in sound system, it needs a symmetric power supply to operated. Here, we will construct a simple power supply circuit which result the output voltage is +35V and -35V. This is the schematic and part of components This project need a center-tap transformer, I recommend to use 3A transformer for good performances, 35 Amp of Diode Bridge for good rectifier, and 4700uF/50V Capacitor (If voltage of capacitor lower than output voltage, the capacitor will be explode, higher is better). So this circuit is very simple, with 4 components you can construct a symmetric power supply. NB:Be careful in the installation of components and wiring. This is a proof...

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