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Super Amplifiers 300W Output Power
The circuit described on this page is a modification of the original Double Barreled Amplifier. The circuit has been simplified somewhat. The circuit board layout is smaller and much more compact. The...
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High Gain Amplifier
The amp is based on the High Gain PCB, so uses a pair of LM3876 (or LM3886) power opamps, run from a ±35V supply. I used a cut-down P88 preamp PCB because I only wanted one preamplifier stage, but the...
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GPIB to RS-232 converter
This project fills the need of anybody who has a test instrument with the GPIB port and likes to get the screen dump on his PC without any GPIB card. It emulates the HP7470A operation on the GPIB side,...
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Video Line Selector
When measure video signal with oscilloscope, video line selector is very useful to find a scan line. The line selecter generates trigger pulse at selected line, oscilloscope will display only selected...
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NTSC Test Signal Generator
A video test pattern generator will be needed when calibrate or test video equipments. To characterize system performance and understand it quantitative, wave form monitor, vector monitor and related...
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YUV(YCbCr) to RGB converter
Recently, most digital video equipments, such as video recorder, DVD player and TV game, have component video output. The component video signal is like RGB video signal, but it cannot connect to RGB...
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Graphic MP3 Player
The MP3 players consist of only semiconductor parts and no complex mechanics. This is a great feature for electronics handicrafts because it can be built easy with the same performance as commercial...
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GPS Data Logger
I have got a GPS module last year and I built a GPS data logger that records position data from the GPS module. The position data is output in NMEA-0183 format and store its sentence into any storage...
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Radio Spectrum Monitor
This is an experimental work to monitor a spectrum pattern in radio band, and is a continuous project from Audio Spectrum Monitor. To analyze the spectrum of an input signal, I chose an Atmel AVR micro...
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Digital Capacitance Meter
This is a simple capacitance meter which can measure capacitance value easy. There are some measurement methods for capacitance, at one time the capacitance was measured with a impedance bridge or a...
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Port-Powered Temperature Meter
This is a four-channel temperature measurmet adapter that works without external power supply. It will suitable for measureing temperature and logging its data with a PC. The circuit diagram is very...
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UltraSonic Radar
This is a very interesting project with many practical applications in security and alarm systems for homes, shops and cars. It consists of a set of ultrasonic receiver and transmitter which operate at...
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Fuzz-box
All-FET design Valve-like distortion behaviorParts:P1______________10K Log. PotentiometerR1_______________1M 1/4W ResistorR2_______________3K3 1/4W ResistorR3_______________2K2 1/4W...
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Precision Metronome & Pitch generator
Precision Frequency generator 1 to 999 Hz Precision Metronome 1 to 999 beats per minuteCircuit Diagram:Parts:R1__________1M 1/4W ResistorR2_________22K 1/4W ResistorR3__________6K8 1/4W...
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IC Controlled Emergency Light with Charger
The circuit shown here is that of the IC controlled emergency light. Its main features are: automatic switching-on of the light on mains failure and battery charger with overcharge protection. When...
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Lead Acid Battery Charger
Parts List:C1 = 100uF/63VC2 = 10uF/63VD1 = 1N5401/NTE5801D2 = LED (Red, 5mm)Q1 = NTE374/BD140Q2 = NTE123AP/BC547R1 = 120 Ohm R2 = 82 Ohm R3 = 10K R4 = 33K R5 = 22KP1 = 2K2U1 = LM350 (On large...
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Foam Cutting Power Supply
After seeing other modelers building their model wings from plastic foam, I decided that I wanted to do the same. Building your wings from foam covered with 1/16 in. balsa can produce a strong and...
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Motorcycle Battery Charger
This 3A charger was originally designed to work with small batteries like those used in motorcycles. In principle it can be used to charge car batteries also but will take a lot longer.The charger...
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Active Antenna HF/VHF/UHF, 3-3000MHz
If you have a shortwave or high-frequency receiver or scanner that is struggling to capture signals with a short, whip antenna, and you'd like the kind of performance that a 60-foot 'longwire' antenna...
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Cranial Electrotherapy Stimulator
Current generated flows through clips placed on the earlobesOutput current adjustable from 80 to 600 microAmperesDevice purpose:Owing to the recent launching in Europe of Cranial Electrotherapy...
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