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Meters
Simple version. Full version located here
http://kazus.info/indexs/list_pages_categories/18/0/0.html
Constant Brightness LED Stroboscope - For measuring the speed of small motors
CONTINUITY TESTER. Among the essentials for circuit design and prototyping is the continuity tester, a simple device which provides an audible indication when a sufficiently low resistance is applied between its input probes. This version has a feature which automatically turns off the tester after about two minutes, thereby saving the 9 volt battery from inadvertent discharge.
MOSFET testing
VU Meter 5 with UAA180
Mini audio spectrum analyzer
VU Meter 4 with LM3915 [10 Led] for Power Amp.
VU Meter 3 with LM3915 [10 Led]
VU Meter 2 with LM3915-LM3916 [19 Led]
VU Meter 1 with transistor. It is a simple circuit of optical index of level of sound signals, adapted in various needs of user.
Tester for transistor, diodes and SCRs by F.V.Hughes
High Temperature ALARM
Frequency counter (0 HZ - 1 MHZ)
Frequency Meter 1HZ to 1MHZ
Digital Volt and Ambere meter
DC Voltmeter with High input impedance
Voltmeter with LED for car battery
Single-Ended vs Push-Pull. (Scott Francland) part 2
Single-Ended vs Push-Pull. (Scott Francland) part 1
A frequency meter metal detector. We have designed the metal detector, the principle of operation which one differs from the classic schemes (BFO, transmit-receive known as "two-boxes" metal detector, inductive). Our device has a simple design and one has the quite good characteristics.
A virtual measuring instrument for your PC. The virtual frequency meter is program for PC and simple measuring instrument, which is connected to COM to port of the computer. The virtual device allows to measure frequency, period, time frames and score impulses.
Mains frequency meter (simple)
Electric field detector. The circuit will come handy when you have to follow the mains wires buried in the wall or even water pipes provided they are not too far away (2-4cm max). (simple)
Sensitive geomagnetic detector. This is a rather sensitive circuit which will detect minute variations of a magnetic field, particularly the Earth magnetic field. (simple)
Seismic detector (simple)
Geomagneticfield detector (simple)
"In-Circuit" Electrolytic Tester (PIC)
PIC Logic Probe with Pulser
M-266C Multimeter Mastech
3211D Multimeter
MY-68 Multimeter Mastech
MY-64 Multimeter Mastech
MY-62 Multimeter Mastech
MY-61 Multimeter Mastech
M-9502 Multimeter Mastech
M-93A Multimeter Mastech
M-932 Multimeter Mastech
M-93 Multimeter Mastech
M-890G Multimeter Mastech
M-890F Multimeter Mastech
M-890D Multimeter Mastech
M-890C+ Multimeter Mastech
M-838 Multimeter Mastech
M-832 Multimeter Mastech
M-830B Multimeter Mastech
M-3900 Multimeter Mastech
M-320 Multimeter Mastech
M-300 Multimeter Mastech
M-266F Multimeter Mastech
Vertical Deflection Amplifier - Oscilloscope
Analog Switch - Oscilloscope
Sweep Generator - Oscilloscope
Oscilloscope Block Diagram and Schematics
3 Phase - 3 Wire Phase Sequence Indicator - A very useful gadget to find out the order in which the phases are appearing.
220V live wire-in-wall scanner
Wire tracer
Heartbeat transducer
Visual metronome
Strain gauge sensor
ELF monitor
Adjustable continuity tester
Noise generator
Audible metronome
Video detector
Resistance tester
Electronic stethoscope
Ultrasonic motion detector
Geiger counter
Low voltage DC speed controller
Event counter
Electroscope
Darkness monitor
Ion detector
IR body heat detector
Air flow detector
RF Detector
Audible continuity tester
Electronic air flow detector
Field-strength meter
Electromagnetic field detector
Some portable digital multimeters (DMM)
Repair Memories
Wall Wart Information
Nifty Original Ideas: / Test Probes Too Big? / Wristwatch Hell / Phone Line Indicator
"Super Octopus" & ESR Test Adapter Project
Sine Wave Generator Project
99 Cent ESR Test Adapter
ESR Testing
Function Generator. This kit is limited to < 100 kHz and has an output impedance of 600 ohms.
"Octopus" Oscilloscope Test Adapters
Digital Mulimeter MASTECH M266C
Digital Mulimeter MASTECH M266F
Digital Mulimeter MASTECH M9502
Digital Mulimeter MASTECH MY-64
Digital Mulimeter MASTECH MY-62
Digital Mulimeter MASTECH MY-61
Digital Mulimeter MASTECH M3900
Digital Mulimeter MASTECH 3211D
Digital Mulimeter MASTECH M320
Digital Mulimeter MASTECH M300
Digital Mulimeter MASTECH M890G
Unilogic v1.42- "realtime" oscilloscope, frequency meter (LPT)
SWR - Meter
Lightning Detector
Seismic Detector
Geomagnetic Field Detector
UltraSonic Radar
Contactless AC Mains Voltage Detector
Frequency Measurements Using PC
Simple Sensitive Remote Control Tester
Handy Zener Diode Tester
Water Level Indicator With Alarm
OFF-LINE TELEPHONE TESTER
Metal Detector
CAPACITANCE BRIDGE
SIMPLE LOGIC PROBE
AUTOMATIC TEMPERATURE CONTROLLER
WATER LEVEL CONTROLLER USING 3-PHASE STARTER
DIGITAL SPEEDOMETER
Fluid level detector
Designing Transistor biasing Circuits Using QBasic
Electromagnetic Field Probe with Meter
InfraRed Remote Control Tester
Zener Diode Tester
Electromagnetic Field Detector
Temperature Monitor
Static Electricity / Negative Ion Detector
Simple FSM- Field Strength Meter
FSM- Field Strength Meter
EpromProgrammer HardwareTester
Battery Discharge Monitor
Audio Noise Sources for Generating Phase Noise (22k)
Low Noise Amplifier for Phase Noise Measurements (33k)
Reducing Vibration Induced Phase Noise - Some Research Ideas
Vibration-Induced Phase Noise and Vibration Isolation (includes links to spreadsheets for vibration calculations)
Finesse Regulator Noise
VHF Oscillator and Multiplier AM Noise
Low Phase Noise Systems - Hints and Tips
Phase Noise, Harmonics and Sub-Harmonics
Low-Cost Phase Noise Measurement
Liquid Barometer. This liquid barometer features a temperature-controlled air chamber for excellent accuracy. Weather Circuits.
Rain Detector (15k) Stick this out the window instead of your hand. Weather Circuits.
Simple MIDI tester
Digital Remote Thermometer. Remote sensor send data via mains supply. Temperature range: 00.0 to 99.9C
LED Display controller
Digital/Standard Phone Line Tester
Simple Polarity Tester
Light/Dark Detector
Ultrasonic Intruder detector
Thermometer and thermostat for Room temperatures
MOSFET testing
MOSFET current sensing
Leakage detector
Precision Audio Millivoltmeter. Measures 10mV to 50Volt RMS in eight ranges
Circuit of rf impedance bridge
Noise bridge measuring both R and X
Circuit diagram of the noise bridge
A sensitive crystal diode checker of field-strenght meter using an af transistor as dc amplifier
High-gain field-strength meter by WA4DXP
Circuit diagram of the meter swithing for a mounted reflectometer
Circuit of coupler unit
Circuit of in-line rms/p.e.p. wattmeter
Method of measuring p.e.p output in relation to mean output with two-tone source
Method of using thermal converter for higher powers
Method of application of rf to the bridge
A thermistor bridge
Suitable two-lamp comparator
Test Equipment - power supply (2)
Test Equipment - power supply (1)
Oscillator circuit to find value of transistor ft
Transistor tester
Tester to measure mutual conductance of FETs
Suggested arrangement for simple valve tests
Circuit of linear-scale capacitance meter
Circuit diagram of the simple direct-reading capacitance meter
Circuit of linear scale resistance meter
The amplifier and detector circuit
Oscillator
Noise factor comparator
Noise diode circuit suitable for unbalanced input
Noise diode circuit suitable for balanced input
Power supply for the diode noise source
DC filament supply with series transistor control (Noise measurements)
Zener diode reference noise source
Noise generator using reverse-biased diode
V/I Curve Tracer. Convert an oscilloscope into an indispensable component tester and troubleshooting tool. Test Equipment.
Lightning Detector. Detects radio pulses from approaching lightning storms! Weather Circuits.
Cloud Charge Monitor (59.4k) Watch the electrical charges dance in the clouds above during a thunderstorm! Weather Circuits.
Frequency and Capacitance meter
TTL Pulse Reading Logic Probe
Rain Detector
Simple Lie Detector
VU LED meter
Mains Wiring detector
Electric Field detector
Taxi phone automatic dialler
Audible continuity tester
Wire tracer
Signal generator for signal tracer
Electronic level
Digital volt meter
Adjustable continuity tested
Frequency counter
Tri-Waveform Generator
220V live wire-in-wall scanner
Owens Bridge Inductance Measurement Device
ESR Meter
Line Output / Flyback transformer tester
Simple 6-Digit 40MHz Frequency Counter Module
Automatic stud detector
Capacitance meter
Capacitance meter
AC Line Current Detector
Triangle and Squarewave Generator
Signal tracer / injector
Voltage probe
Live line detector
Grid dip meter
PCB VSWR bridge
Electric field & leakage detector
Simple polarity detector
RCM710 Electronic Scale
3 - 12 MHz Signal Generator
Some simple test equipment to build
RF Power Meter for the QRPer
Dip Oscillator for HF
Two Tone Audio Oscillator (use for SSB tests)
Simple pH meter
Temperature compensated pH meter
pH meter with calibration
Four Channel Oscilloscope Adapter
Arbitrary Waveform Generator
Digital Pressure Gauge
Remote Field Strength Meter
Digital frequency counter
Function generator
High / Low indicator
AC/DC LED Indicator
Micro ohm meter
Micro volt probe
MOSFET tester
Power factor meter
Ramp generator
LASER/LED light output intensity meter (PDF)
Frequency and capacitance meter
Resistor decade box
Simple light sensor adapter for oscilloscope
Time Domain Reflectometer (TDR)
pH Meter
Multi Wire Cable Tester
Connection tester
EMF field probe
Function generator
Logic probe
Zener diode tester
Mini DDS (direct digital synthesizer)
LCD frequency counter (PIC16F84)
Pulse Reading Logic Probe
Pink Noise Generator for Audio Testing
Audio Millivoltmeter
Audio Test Oscillator
Full Featured Transistor Tester
Opamp Design and Test Board
Microphone Circuit Test Oscillator
Distortion Analyser
Self Oscillating Amplifier for Distortion Testing
120MHz frequency counter
Capacitance meter that connects to multimeter
Transistor tester and signal injector
Continuity tester
Square wave oscillator (555)
Build a Magnetic Field Immunity Tester
555 Timer IC Tester
555 go / no-go tester
12V Lead-Acid Battery Monitor
Continuity tester 2
Continuity tester
Logic probe
4-channel DSO for oscilloscope
In-circuit electrolytic tester
PIC logic probe with pulser
Cable Tester
Infra Red remote control tester
Zener Diode Tester
EMF Probe with Meter
Function Generator
Logic Probe
Milligauss Meter
Square Wave Oscillator
Sine Wave Generator
Connection Tester
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