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Test equipment circuit diagrams

10Hz - 100KHz D.D.S. Function Generator
2.5 GHz Frequency counter
-20 dB Couplers for use with a with a spectrum analyzer or other sensitive detector
-20 dBm, 14.060 MHz Precision Signal Source
20kV Digital High Voltage Meter
220V live wire-in-wall scanner
250MHz RF Generator with 1kHz display resolution
3 in one tester (audio, tone generator, diode/circuit tester)
555 go / no-go tester
555 Timer IC Tester
5Hz to 500KHz frequency meter
AD9850 DDS daughterboard
Alarm circuit to remind you to turn off your DMM (digital multimeter)
Audible Logic Probe based on LM339 operational amplifier
Audio Millivoltmeter
Audio Millivoltmeter
Audio Test Oscillator
Automatic heat limiter for soldering iron
Battery Tester for 1.5 and 9V
BCD readout frequency counter
Beeper to find short circuits
Beeper to find short circuits (continuity tester)
Build an inexpensive Hall effect Gaussmeter
Capacitance meter
Capacitance meter - precision meter for small capacitors
Connection tester for checking solder joints and other connections
Conrad Electronics MM3610D multimeter cable pinout
Contactless Mains Voltage Indicator
Contactless Mains Voltage Indicator
Continuity tester
Continuity tester 2
Continuity Tester based on 4 x 2N3904 and 1 x 2N3905 transistors
Continuity tester using transistors
Crystal tester
Crystal tester that covers a range of 32kHz to 24MHz
DCC Ammeter using ZXCT1009 current monitor
DDS from 1-60 MHz with built-in amplifier and variable output level using Analog Devices AD9851
Design for a slightly more expensive Gaussmeter
Digital SWR / Power Meter
Digital voltmeter (DVM)
Digital Voltmeter using ICL7107
Digital Wattmeter, measures from nanowatts to kilowatts using AD8307, PIC16F876, LCD Display
Dip Oscillator for HF
Distortion Analyser
Distortion Analyser
Elecraft XG2 receiver test oscillator (PDF)
Electric field & leakage detector
Electronic Circuit for Crystal Parameter Measurement
EMF field probe (electromagnetic field probe) covering up to 100kHz
ESR Meter
Exclusive 2.5 GHz Frequency Counter with Blue 2x16 LCD display
Field Strength Meter (FSM) covers 2Mhz - 1Ghz with peak reception at 3-200Mhz
Field strength meter for the 137 kHz band
Fixed Frequency "Tuner Dipper"
Fluke 8010 / 8012 Interface
Frequency and capacitance meter
Frequency Counter / Timer / Logic Tester
Frequency counter measures to 2.5 GHz and offers LCD display
Full Featured Transistor Tester
Function generator based on 555 timer and three 2N2222 transistors
Function generator based on 8038PCD function generator IC
Function generator based upon 8038 waveform generator IC
Ground Fault Indicator
Heathkit signal generator user manual and circuit diagram
High Impedance Voltmeter
High Resistance Voltmeter
Homebrew signal generator tunable from 3 to 30 Mhz
Improved DCC Ammeter (2009) using Zetex ZXCT1009 current monitor
In-circuit electrolytic capacitor checker
In-circuit electrolytic capacitor tester
Inductive meter adapter to measure inductance using a frequency counter
Isolated oscilloscope probe
Latching Continuity Tester to help find intermittent faults, has quite a few innovative features
Latching continuity tester using 4093
LC meter with LCD display for readout
LCD Frequency Counter
LCD frequency counter (PIC16F84)
Led display digital Voltmeter using ICL7107
Line Output / Flyback transformer tester
Linear Resistance Meter
Linear Resistance Meter
Linear scale analog watt meter / RF power meter
Linkwitz Cosine Burst Generator
Live line detector
Logic probe
Logic probe
Logic probe based on CMOS 4001 chip
Logic probe with 7-segment display based on 74LS00 and 74LS47
Logic probe with pulser
Low Power Antenna Analyzer and ATU Tuning Aid
Low-Cost Phase Noise Measurement
Microphone Circuit Test Oscillator
Microphone Circuit Test Oscillator
Microphone polarity tester circuit diagran
Mini DDS (direct digital synthesizer) using an Analog Devices AD9832 (12MHz maximum frequency)
Mini oscilloscope based on PIC18F4620 and standard 16x2 text LCD display module
Mini tester: Handles continuity testing, resistor testing, capacitor testing and diode testing
Miniscope - simple all-valve 1-inch CRT oscilloscope
MOSFET tester for N-type MOSFET transistors
MOSFET transistor tester
Multi wire cable tester that handles up to eight conductors
Multi-trace scope display that allows up to 4 channels to be viewed on a single oscilloscope channel
Opamp Design and Test Board
Optical ballistic chronograph for measuring projectile velocity
Oscillopscope triggering circuit for recording long transients at fast sweep speeds (PDF)
Oscilloscope / Logic Analyzer based on an Arduino
Oscilloscope testing module (huntron circuit)
Oscilloscope testing module (Huntron circuit) that shows Lissajous patterns
Panel Mounting Radio Frequency Counter
PCB board tester and RF detector circuir diagrams
Philips SB-6668 frequency counter upgrade
PIC based frequency counter
PIC logic probe with pulser
PIC16F84 based diode tester
Picoammeter circuit schematic with 4 ranges using CA3420
Pink Noise Generator for Audio Testing
Poor man's frequency counter
Precision audio millivoltmeter
Precision Frequency Marker
Precision VXO for Crystal Characterization & Matching
Pulse Reading Logic Probe
Pulse Reading Logic Probe
Quickie servo tester for testing servo motors (based on Atmel AT90S2343)
RCM710 electronic scale, technical manual including schematic
Resistor decade box
Return Loss Bridge
RF field strength meter
RF Power Meter for the QRP measures up to 25 watts
RF probe circuit diagram and Autotrax PCB layout
Schematics and C code for a 0-5V PIC LCD volt meter
Schematics and C code for a PIC frequency counter operating up to about 50 MHz (7 segment)
Schematics and C code for a PIC frequency counter operating up to about 50 MHz (LCD)
Self Oscillating Amplifier for Distortion Testing
Self-powered Fast Battery-Tester - Tests 1.5 to 15 Volt cells
Sensor to display, built with thermistor, 12-bit ADC, 89S52 and LED display
Service monitor / deviation meter circuit
Servo Motor Test Circuit (LM555)
Signal Tracer and Injector
Simple diagnostic tool for use on repeaters in the field
Simple electronic S meter
Simple Frequency Counter
Simple Ground Loss bridge for Ground Loss Measurement at LF
Simple Inductance Meter
Simple light sensor adapter for oscilloscope
Simple Ph Meter
Simple pH Meter Circuit, A Low Cost Adapter for Your Digital Voltmeter
Simple polarity detector
Simple Polarity Tester
Simple test equipment to build
Simplified Measurement of Output Impedance for Audio Circuits
Single chip digital voltmeter using ICL7129
Soft Power On Tester for Amplifiers
Sound pressure level meter
Spectrum analyzer Mk 1
Spectrum analyzer Mk 2
Standalone LED tester
Stereo Test Tone Generator
Stereo Test Tone Generator
Superprobe handheld test device based on a PIC16F870
SWR Bridge 1 to 1000 Mhz (1GHz)
TDR cable reflection tester (Time Domain Reflectometer)
TDS/PPM Meter for measuring of the amount of salts in a solution
The ESP SIM (Sound Impairment Monitor)
The u-counter, a PIC based programmable frequency meter (PDF)
Thermistor Thermometer: LCD version
Time Domain Reflectometer (TDR)
TinyScope - simple all-valve 1-inch CRT oscilloscope
Transistor Tester
Transistor tester using 555 timer and 4027
Triple Stroboscope
True RMS Watt Meter
TTL pulse counter/logic probe
TTL Pulse Reading Logic Probe
TXTVb - 70cm ATV Test Generator (PDF)
UHF signal generator
Ultra-simple Voltage Probe
Ultra-simple voltage probe
Universal frequency counter & voltage meter
UTP Cable Tester
VCR Tuner Based RF Spectrum Analyzer Schematic
VHF signal generator
Wire tracer
Wire Tracer (Receiver)
Wire Tracer (Transmitter)
Wireless Frequency counter
XTal Tester for testing quartz crystals based on a pair of BC550C PNP transistors
Z80 controlled Viscometer project
Zener diode tester based on a 555 timer

Category: Schematics | Views: 3017 | Added by: kilovolt | Rating: 3.0/2

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