Meters circuit
Simple version. Full version location at http://circuitsradio.com
View original of this circuit: http://circuitsradio.com/schematics/electrical-engineering/Meters/index.html
Line Output / Flyback transformer tester
In-Circuit Electrolytic Tester (PIC)
Octopus Oscilloscope Test Adapters
Super Octopus & ESR Test Adapter Project
120MHz frequency counter
12V Lead-Acid Battery Monitor
220V live wire-in-wall scanner
220V live wire-in-wall scanner
3 - 12 MHz Signal Generator
3 Phase - 3 Wire Phase Sequence Indicator - A very useful gadget to find out the order in which the phases are appearing.
3211D Multimeter
4-channel DSO for oscilloscope
555 go / no-go tester
555 Timer IC Tester
99 Cent ESR Test Adapter
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 sensitive crystal diode checker of field-strenght meter using an af transistor as dc amplifier
A thermistor bridge
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.
AC Line Current Detector
AC/DC LED Indicator
Adjustable continuity tested
Adjustable continuity tester
Air flow detector
Analog Switch - Oscilloscope
Arbitrary Waveform Generator
Audible continuity tester
Audible continuity tester
Audible metronome
Audio Millivoltmeter
Audio Noise Sources for Generating Phase Noise (22k)
Audio Test Oscillator
Automatic stud detector
AUTOMATIC TEMPERATURE CONTROLLER
Battery Discharge Monitor
Build a Magnetic Field Immunity Tester
Cable Tester
CAPACITANCE BRIDGE
Capacitance meter
Capacitance meter
Capacitance meter that connects to multimeter
Circuit diagram of the meter swithing for a mounted reflectometer
Circuit diagram of the noise bridge
Circuit diagram of the simple direct-reading capacitance meter
Circuit of coupler unit
Circuit of in-line rms/p.e.p. wattmeter
Circuit of linear scale resistance meter
Circuit of linear-scale capacitance meter
Circuit of rf impedance bridge
Cloud Charge Monitor (59.4k) Watch the electrical charges dance in the clouds above during a thunderstorm! Weather Circuits.
Connection tester
Connection Tester
Constant Brightness LED Stroboscope - For measuring the speed of small motors
Contactless AC Mains Voltage Detector
Continuity tester
Continuity tester
Continuity tester 2
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.
Darkness monitor
DC filament supply with series transistor control (Noise measurements)
DC Voltmeter with High input impedance
Designing Transistor biasing Circuits Using QBasic
Digital frequency counter
Digital Mulimeter MASTECH 3211D
Digital Mulimeter MASTECH M266C
Digital Mulimeter MASTECH M266F
Digital Mulimeter MASTECH M300
Digital Mulimeter MASTECH M320
Digital Mulimeter MASTECH M3900
Digital Mulimeter MASTECH M890G
Digital Mulimeter MASTECH M9502
Digital Mulimeter MASTECH MY-61
Digital Mulimeter MASTECH MY-62
Digital Mulimeter MASTECH MY-64
Digital Pressure Gauge
Digital Remote Thermometer. Remote sensor send data via mains supply. Temperature range: 00.0 to 99.9C
DIGITAL SPEEDOMETER
Digital Volt and Ambere meter
Digital volt meter
Digital/Standard Phone Line Tester
Dip Oscillator for HF
Distortion Analyser
Electric field & leakage detector
Electric Field detector
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)
Electromagnetic field detector
Electromagnetic Field Detector
Electromagnetic Field Probe with Meter
Electronic air flow detector
Electronic level
Electronic stethoscope
Electroscope
ELF monitor
EMF field probe
EMF Probe with Meter
EpromProgrammer HardwareTester
ESR Meter
ESR Testing
Event counter
Field-strength meter
Finesse Regulator Noise
Fluid level detector
Four Channel Oscilloscope Adapter
Frequency and capacitance meter
Frequency and Capacitance meter
Frequency counter
Frequency counter (0 HZ - 1 MHZ)
Frequency Measurements Using PC
Frequency Meter 1HZ to 1MHZ
FSM- Field Strength Meter
Full Featured Transistor Tester
Function generator
Function generator
Function Generator
Function Generator. This kit is limited to < 100 kHz and has an output impedance of 600 ohms.
Geiger counter
Geomagnetic Field Detector
Geomagneticfield detector (simple)
Grid dip meter
Handy Zener Diode Tester
Heartbeat transducer
High / Low indicator
High Temperature ALARM
High-gain field-strength meter by WA4DXP
In-circuit electrolytic tester
Infra Red remote control tester
InfraRed Remote Control Tester
Ion detector
IR body heat detector
LASER/LED light output intensity meter (PDF)
LCD frequency counter (PIC16F84)
Leakage detector
LED Display controller
Light/Dark Detector
Lightning Detector
Lightning Detector. Detects radio pulses from approaching lightning storms! Weather Circuits.
Liquid Barometer. This liquid barometer features a temperature-controlled air chamber for excellent accuracy. Weather Circuits.
Live line detector
Logic probe
Logic probe
Logic Probe
Low Noise Amplifier for Phase Noise Measurements (33k)
Low Phase Noise Systems - Hints and Tips
Low voltage DC speed controller
Low-Cost Phase Noise Measurement
M-266C Multimeter Mastech
M-266F Multimeter Mastech
M-300 Multimeter Mastech
M-320 Multimeter Mastech
M-3900 Multimeter Mastech
M-830B Multimeter Mastech
M-832 Multimeter Mastech
M-838 Multimeter Mastech
M-890C+ Multimeter Mastech
M-890D Multimeter Mastech
M-890F Multimeter Mastech
M-890G Multimeter Mastech
M-93 Multimeter Mastech
M-932 Multimeter Mastech
M-93A Multimeter Mastech
M-9502 Multimeter Mastech
Mains frequency meter (simple)
Mains Wiring detector
Metal Detector
Method of application of rf to the bridge
Method of measuring p.e.p output in relation to mean output with two-tone source
Method of using thermal converter for higher powers
Micro ohm meter
Micro volt probe
Microphone Circuit Test Oscillator
Milligauss Meter
Mini audio spectrum analyzer
Mini DDS (direct digital synthesizer)
MOSFET current sensing
MOSFET tester
MOSFET testing
MOSFET testing
Multi Wire Cable Tester
MY-61 Multimeter Mastech
MY-62 Multimeter Mastech
MY-64 Multimeter Mastech
MY-68 Multimeter Mastech
Nifty Original Ideas: / Test Probes Too Big? / Wristwatch Hell / Phone Line Indicator
Noise bridge measuring both R and X
Noise diode circuit suitable for balanced input
Noise diode circuit suitable for unbalanced input
Noise factor comparator
Noise generator
Noise generator using reverse-biased diode
OFF-LINE TELEPHONE TESTER
Opamp Design and Test Board
Oscillator
Oscillator circuit to find value of transistor ft
Oscilloscope Block Diagram and Schematics
Owens Bridge Inductance Measurement Device
PCB VSWR bridge
pH Meter
pH meter with calibration
Phase Noise, Harmonics and Sub-Harmonics
PIC logic probe with pulser
PIC Logic Probe with Pulser
Pink Noise Generator for Audio Testing
Power factor meter
Power supply for the diode noise source
Precision Audio Millivoltmeter. Measures 10mV to 50Volt RMS in eight ranges
Pulse Reading Logic Probe
Rain Detector
Rain Detector (15k) Stick this out the window instead of your hand. Weather Circuits.
Ramp generator
RCM710 Electronic Scale
Reducing Vibration Induced Phase Noise - Some Research Ideas
Remote Field Strength Meter
Repair Memories
Resistance tester
Resistor decade box
RF Detector
RF Power Meter for the QRPer
Seismic Detector
Seismic detector (simple)
Self Oscillating Amplifier for Distortion Testing
Sensitive geomagnetic detector. This is a rather sensitive circuit which will detect minute variations of a magnetic field, particularly the Earth magnetic field. (simple)
Signal generator for signal tracer
Signal tracer / injector
Simple 6-Digit 40MHz Frequency Counter Module
Simple FSM- Field Strength Meter
Simple Lie Detector
Simple light sensor adapter for oscilloscope
SIMPLE LOGIC PROBE
Simple MIDI tester
Simple pH meter
Simple polarity detector
Simple Polarity Tester
Simple Sensitive Remote Control Tester
Sine Wave Generator
Sine Wave Generator Project
Single-Ended vs Push-Pull. (Scott Francland) part 1
Single-Ended vs Push-Pull. (Scott Francland) part 2
Some portable digital multimeters (DMM)
Some simple test equipment to build
Square Wave Oscillator
Square wave oscillator (555)
Static Electricity / Negative Ion Detector
Strain gauge sensor
Suggested arrangement for simple valve tests
Suitable two-lamp comparator
Sweep Generator - Oscilloscope
SWR - Meter
Taxi phone automatic dialler
Temperature compensated pH meter
Temperature Monitor
Test Equipment - power supply (1)
Test Equipment - power supply (2)
Tester for transistor, diodes and SCRs by F.V.Hughes
Tester to measure mutual conductance of FETs
The amplifier and detector circuit
Thermometer and thermostat for Room temperatures
Time Domain Reflectometer (TDR)
Transistor tester
Transistor tester and signal injector
Tri-Waveform Generator
Triangle and Squarewave Generator
TTL Pulse Reading Logic Probe
Two Tone Audio Oscillator (use for SSB tests)
Ultrasonic Intruder detector
Ultrasonic motion detector
UltraSonic Radar
Unilogic v1.42- realtime oscilloscope, frequency meter (LPT)
V/I Curve Tracer. Convert an oscilloscope into an indispensable component tester and troubleshooting tool. Test Equipment.
Vertical Deflection Amplifier - Oscilloscope
VHF Oscillator and Multiplier AM Noise
Vibration-Induced Phase Noise and Vibration Isolation (includes links to spreadsheets for vibration calculations)
Video detector
Visual metronome
Voltage probe
Voltmeter with LED for car battery
VU LED meter
VU Meter 1 with transistor. It is a simple circuit of optical index of level of sound signals, adapted in various needs of user.
VU Meter 2 with LM3915-LM3916 [19 Led]
VU Meter 3 with LM3915 [10 Led]
VU Meter 4 with LM3915 [10 Led] for Power Amp.
VU Meter 5 with UAA180
Wall Wart Information
WATER LEVEL CONTROLLER USING 3-PHASE STARTER
Water Level Indicator With Alarm
Wire tracer
Wire tracer
Zener diode reference noise source
Zener diode tester
Zener Diode Tester
Zener Diode Tester
View original of this circuit: http://circuitsradio.com/schematics/electrical-engineering/Meters/index.html