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Horizontaal
Measurement circuits 
10 LED VU meter LM3915
4 channel adapter for the oscilloscope to see the wavefrom of four kinds of the signals at the same time with the oscilloscope
Accelerometer ADXL250
AC Current Probe for Oscilloscope Use
Angle measurment coder/decoder Gray code circuit
Audio test equipment
Beat Balance Metal Detector Instead of using a search and a reference oscillator as with BFO, or Tx and Rx coils as with IB, it uses two transmitters or search oscillators with IB-style coil overlap. The frequencies of the two oscillators are then mixed in similar fashion to BFO, to produce an audible heterodyne
Capacitance meter the Femto capacitance meter measures in the low femtofarad area having a resolution of 10 femtofarads (fF). The meter has six ranges allowing a maximum measuremenet is 4 microfarads, ICL7106
Capacitance meter Digital Capacitance Meter, microcntroller AT90S2313
Current meter used to measure the current from a solar panel. It has very low power loss for currents in the 0-10A range. It also works as a general purpose DC current meter
Current Sense Circuit Collection pdf file
DC voltmeter with high input impedance
Digitale voltmeter met de 74C928 pdf file, in Dutch
Digital Volt and Ampere meter Digital Volt and Ampere meter
Distortion measurement circuit
DVM with the ICL7106 This application note describes a technique for auto-ranging a battery operated DVM suitable for panel meter applications. Also, circuit ideas will be presented for conductance and resistance measurement, ICL7106, pdf file
Electronic Stethoscope
EMF probe with meter to locate stray electromagnetic (EM) fields
Energy meter an energy meter using Analog Devices’ ADE7757 chip for singlephase, 2-wire (phase and neutral) systems used in households, pdf file
ESR Meter Fully-built and calibrated EVB ESR meter
Flowmeter flowsensor circuit
Frequency Counter microcontroller, ATMega161, Frequency measurement from 0.1Hz to ≥10MHz
Frequency Counter LCD frequency meter, RPM meter and rotational speed sensor
Frequentiemeter 4093, 555, in Dutch
Gaussmeter the strength of the magnetic field, magnetometer, Gaussmeter, Hall effect Gaussmeter
Un indicateur de tension et un VU-mètre en Français
ICL7106/ICL7107 Digital LED Ammeter (Ampere Meter)
LED Stroboscope How to measure rotational speed using a stroboscope, building the stroboscope
LED VU meter LM3915
Lightning flash counter this circuit allows the detection of every lightning strike in a radius of about 20-30 km from the counter, by receiving the EM pulse with a special antenna
Light Pollution Meter Light Pollution Meter, Notes on the design and construction of a visual comparison photometer for measuring sky brightness and light pollution, schematics
Logic Probe This logic probe uses a single CMOS IC and shows three logic conditions, High, Low and Pulsing
Lucht benzine meter air/fuel measurement, lamba sonde circuit
LM3914 battery monitor can be used to measure voltages
LM3914 Dot/Bar Display Driver datasheet The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display, pdf file
LM3915 dot/bar display driver pdf file
LM3915 Dot/Bar Display Driver datasheet The LM3915’s 3 dB/step display is suited for signals with wide dynamic range, such as audio level, power, light intensity or vibration, pdf file
Multi Wire Cable Tester A multi wire cable tester with a separate LED for each wire. Will show open circuits, short circuits, reversals, earth faults, continuity and all with four IC's. Designed initially for my intercom, but can be used with alarm wiring, CAT 5 cables and more, UTP cable
Opacity meter for monitoring the rate of flow of powder used in a rapid prototyping machine
Owens bridge inductance measurement device with DC current capability
Oxygen Analyzer
PC-Based Oscilloscope This circuit conditions different signals of frequency below 1 kHz and displays their waveforms on the PC’s screen. The hardware is used to condition the input waveform and convert it to the digital format for interfacing to the PC, pdf file
Period to voltage conversion
Power meter Power meter circuit
PPM and VU meter Peak Programme Meter circuit
Pulse-generator & signal-tracer 1.5V battery-operated
Solar Panel Current Meter This circuit is used to measure the current from a solar panel. It has very low power loss for currents in the 0-10A range
Spectrum Analyser This DC to 50 MHz spectrum analyser uses a standard oscilloscope for display. Dynamic range is better than 70dB
Spindle and Surface Speed Measurement
Stroboscope neon glow lamp, TIC 106D
Stroboscope Stroboscope circuit
Stroboscope pdf file
Tachometer LM2907 Tachometer, Frequency to voltage converter
Test circuits oscillators, generators, testers
Transistor tester and signal injector Tests transistors - locates base lead and finds, CE or BE shorts, Determines transistor gain, Outputs a signal for testing audio circuits
True RMS Watt Meter This circuit will give you a good, Accurate Watt Meter that can measure various power levels
Triple Stroboscope This circuit enables observation of movement between other stroboscopes. Generation of rectangular signal is based on NE555. This circuit requires a low power supply that is made from a simple transformer TR1, traditional rectifier bridge and zener diode
TV testcard generator
Ultrasonic range meter This range meter uses the ultrasonic of about 40 KHz. The way of measuring measures the time which the ultrasonic returns from the measurement object. The about 10-m distance can be measured by adjusting the resistance value of the inner circuit
Universal High-Resistance Voltmeter Universal High-Resistance Voltmeter with opamp and Ammeter, pdf file
USB Live Oscilloscope a fairly simple device which allows to digitize signals with frequencies ranging from DC to around 1MHz with very long sampling buffer
Voltage to Frequency Converter
Volt Meter Led display digital Voltmeter, uses ICL7107 made by INTERSIL, can display any DC voltage in the range of 0-1999 Volts
Volt Meter High Precision Volt Meter
Voltmetre à afficheurs à LED en Français
Voltmetre LCD en Français
VU Meter LM3915
VU-METRE à bargraph (LM3914) en Français
Wattmeter Project Digital Wattmeter Project
Zener diode tester 555 Timer IC
Horizontaal

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