![]() When the right combination of buttons is passed over with the magic wand the LEDs (red, white and blue) flash around the circle and the buzzer sounds. My circuit differs in that I have added the timer and decade counter ICs, and 10 LEDs to flash in a circle and a piezo speaker for sound effect. I found the circuit for the Magic Conjuring Board on the DIY Electronic Projects website (the Magic Wand Conjuring Trick by Rev. To see but they consist mainly of a couple of transistors, resistors, Click Here for the schematic of this project (pdf). With anĪccuracy of about 10% the ranges are 150 to 1700 RPM andĨ50 to 9000 RPM. Object and the RPM can be read by adjusting the dial. This one, I call my Stroboscopic Tachometer. Click image for the schematic in PDF format. The gray ribbon wire goes to the 7 segment displays. The ICL7107 takes most of the space but there are only a few resistors and capacitors along with the 7805 regulator and the 7660 voltage converter. The -5v is supplied using a ICL7660 voltage converter. I used the 7107 datasheet as a guide and added a few components for reading volts AC and Amps. This is my first project using LED displays. Here is a volt/amp meter built with four seven-segment LED displays and driven by a ICL7107 A/D converter. Volt/Amp Meter - Label awaiting final assembly The audio section is on the green board and the video on the brown board. The circuit board is wired on the top surface (because I build most of my projects only once, I use copper clad project boards instead of printed circuit boards) with some lands and buss connections of the under side. The LEDs will light relative to the frequency received. With this gadget you can hear the bat callĪnd see the flashing LEDs at the same time. (These were read at a frequency near 20 KHz.) Here are a few oscilloscope traces of the three waveforms output from my functionn generator. The kit for this project is available from Carl's Electronics (as Ultrasonic Wind Speed Meter Kit). A pair of 40KHz sensors areĪnd the change in frequency, caused by the wind, is detected and displayed as wind speed. Programmable micro-controller PIC16F628-20. The Wind Speed Meter is an electronics kit construction, built around a The meter reads minus (millivolts/gauss) for north pole and plus for south pole. (See the schematic for details.) The gauss meter is built around the A1302 Linear Radiometric Hall Effect Sensor with a LM358 Op Amp to drive the LEDs and a 200mA digital panel meter for the readout. A red LED indicates the north pole of the magnet being measured and a green LED shows the south pole. Here is an alphabetical list of the projects.Īfter some tedious work on the breadboard I finally got my Gauss meter to work just right. (Oscilloscope traces of crystal & oscillator) Try the Capacitance Converter at the bottom of this page.Ĭlick for alphabetical list of the projects. From Wolfden Press Some of these projects were gleaned out of my own experimentation while others are built from available kits.Ĭlick most images for a schematic drawing of the circuit in PDF format.
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