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2026-10-09
- 170 new manuals added in aes, alinco, bitsavers, b&k, century, collins, dovetron, ebooks, eico, electric-eye, freq-electronics, goodwill, hickok, johnson, kantronics, micronta, military, national, rca, scientific_radio, sencore, sylvania, tennelec, triplett, uniden, and xyz.
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2026-10-21
- New beta site for public review.
Circuits
Files
- 25-kV generator tests insulation.pdf
- A Practical Gain Set.pdf
- Absorption Wavemeter.pdf
- Accuracy Tester for Mechanical Watches.pdf
- Accurate Gain-Phase Measurement up to 2.5GHz.pdf
- Accurate Op-Amp Bridge.pdf
- Active DC Load.pdf
- Add a meter to the ETI-560 Mains Cable Seeker 1980-05.jpg
- An Inexpensive Time Domain Reflectometer.pdf
- Anemometer.pdf
- Applause Meter Circuit only.gif
- Applause Meter.pdf
- Audible Conductance Tester.jpg
- Audible Continuity Tester.pdf
- Audio-Visual Continuity Tester.pdf
- Auto Service Meter.pdf
- Beat-Frequency Indicator.pdf
- Blown Fuse Indicator.pdf
- Blown Fuse Indicators.pdf
- Breakdown Voltage Meter.pdf
- Bridge Circuit Meter Substitute.pdf
- Build A Pair Of Lazy Leads.pdf
- Build a Seismograph Part 1 ETT 1989-12.pdf
- Build An Ion Meter Errata RE 1990 03.pdf
- Bus-Line Tracer.pdf
- Cable Reflection Tester.pdf
- Cable Tester - Go-No Go.pdf
- Cable Tester ETI559.pdf
- Capacitance Substitution Box.pdf
- Capacitive Liquid Level Measurement.pdf
- Carvalyzer to Service Tube Car Radios.pdf
- Center Zero Led Bar-Dot Meter.pdf
- Chart Recorder Plots Total Loads in Several Circuits.pdf
- Circuit Breaker Substitution Box.pdf
- Circuits Designed for a Cruel and Unyielding World.pdf
- Climate Logger.pdf
- CLMeterB_Schematic.pdf
- Constant Current Dummy Load.pdf
- Contact Tester Quantifies Open-Short Circuit Tendencies.pdf
- Contactless AC Mains Voltage Detector.zip
- Continuity Checker.zip
- Continuity Tester (2).pdf
- Continuity Tester (3).pdf
- Continuity Tester (4).pdf
- Continuity Tester (5).pdf
- Continuity Tester 1.pdf
- Continuity Tester 2.pdf
- Continuity Tester.pdf
- Crystal Controlled Gate Dip Meter.pdf
- Current Flow Indicator.pdf
- Current Transmitter Calibrator.pdf
- DC Lamp Failure Indicator.pdf
- Dc Voltage Or Current Meter.pdf
- Dead Short Tester.pdf
- Design a 100A Active Load to Test Power Supplies.pdf
- Designing Instrumentation Circuitry with RMS-DC Converters.pdf
- Deviation Meter.pdf
- Differential Audio Distortion Analyzer.pdf
- Digital Barometer Errata ME 1989-01.pdf
- Digital Clock and Thermometer.pdf
- Digital IC Breadboard.pdf
- Digital Insulation Tester (Requires firmware download that may not be available).pdf
- Digital Phototachometer.pdf
- Digital Pressure Gauge.pdf
- Digital Strobe to Measure RPM.pdf
- Digital Wind Speed Meter.pdf
- Diode Air Flow Sensor.pdf
- Diode Matrix Tester.pdf
- Dip Switches To Isolate Faults In A System.pdf
- Distortion Measurement.jpg
- Earth Warning Indicator.pdf
- Electric Fence Tester ETI 1512.pdf
- Electronic Stethoscope.pdf
- Electroscope.pdf
- Electroscopes & Geiger Counters.pdf
- Engineer's Stethoscope.pdf
- Environmental Test Chamber.pdf
- Fart Strength Meter.pdf
- Fiber-Optic Strand Checker.pdf
- Filter to Measure Power Line Harmonics.pdf
- Flexible Fault Detection With Reed Coil Relays.pdf
- Fluxmeter Input For Dmm.pdf
- Four Test Gadgets made with a single hex inverter.pdf
- Fraser Technologies Ltd Applause Meter.pdf
- Geiger Counter.pdf
- Gigaohm Decade Resistance Box.pdf
- Graphic Level Meter 2100.zip
- High-Low Logic Tester.pdf
- High-Performance Dc Voltmeter Converter.pdf
- ICs for Test Instriments.pdf
- Indicators for All Occasions.pdf
- Infrared Remote Tester.pdf
- Instrument Read Out in Braille Comments.pdf
- Intelligent Cable Tester.pdf
- Interface Panel.pdf
- Intermod-Distortion Analyzer Calibrator.pdf
- Ion Meter Errata RE 1990-03.pdf
- KRS Distance Measuring Device Interface Board.pdf
- Lampkin 205A Deviation Meter.pdf
- Leakage Tester.pdf
- LED Oscilloscope.pdf
- LED Visual Data Monitor.jpg
- Line Frequency Meter.pdf
- Linear Scale Frequency Meter PCB ETI 150.pdf
- Liquid Level Alarm.pdf
- Live Wire Scanner for 220V.pdf
- Load-transient-response for voltage regulators.pdf
- Locate Faults In Coaxial Cables.pdf
- Low Cost Weigh Scales.pdf
- Magnetic Field Detector.pdf
- Magnetic Field Sensors.pdf
- Magnetometer.pdf
- Mains Cable Seeker.pdf
- Make 4 Test Gadgets from one Hex Inverter IC.pdf
- Making a Wheatstone Bridge.pdf
- Making Use of Audio Indicators.pdf
- Maximum Voltage Detector.pdf
- Measurement and Control Circuits Collection.pdf
- Measuring Complex Impedances.pdf
- Measuring Insulation Resistance.pdf
- Measuring Large Currents.pdf
- Measuring Light Intensity.pdf
- MEASURING MAGNETIC FIELDS.pdf
- Measuring Nanoamperes.pdf
- Measuring relative humidity.pdf
- Measuring Standby Power Of Cmos Rams.pdf
- Measuring Temperatures on Computer Chips.pdf
- Microwave Oven Analyzer.pdf
- Mini-Metrology Lab.pdf
- Modem Tester.zip
- Modulated Signal Injector.pdf
- Motor Speed Measurement Circuit.pdf
- Multiple Test Point Monitor.pdf
- Old School Instruments and Accessories.pdf
- Opacity Measurement.pdf
- Overload Proof Current Indicator.pdf
- Passive Distortion Measuring Network.pdf
- Phase Measurement With A Pll.pdf
- Piezoelectric driver finds buzzer's resonant Frequency.pdf
- Pipe and Cable Locator.pdf
- Pola Testers.pdf
- Polarity Sensing Continuity Tester.pdf
- Ponyprog.zip
- Portable Gas Detector.pdf
- Power Failure Indicator.pdf
- Power Meter with 1 Percent Accuracy.pdf
- Power Supply Tester.pdf
- Precision active load operates as low as 2V.pdf
- Precision Electroscope.pdf
- Precision voltage-controlled current sink tests power supplies.pdf
- Pulse Width Range Detector.pdf
- Quicktracer.zip
- R&C Substitution Boxes.pdf
- Radiation Monitor.pdf
- Radon Monitor Part 2.pdf
- Relative Humidity Gauge.pdf
- Relative Humidity Measurement.pdf
- Resistance Bridge.pdf
- Resistance Decade Box (2).pdf
- Resistance Decade Box.pdf
- Resistor Bank.pdf
- RF Exposure Test Methods.pdf
- Rf Voltmeter.pdf
- Salt Concentration Meter.pdf
- Sanatron Current Timebase.pdf
- Self Powered Dummy Load.pdf
- Series Wired Christmas Light Tester.pdf
- Setting up your oscilloscope to measure jitter.pdf
- Short Circuit Detector.pdf
- Short Circuit Finder.pdf
- Signal and Voltage Indicators.pdf
- Simple Impedance Bridge.pdf
- Simple LED Mains Tester.pdf
- Simple Test Circuits.pdf
- Sobriety Tester.zip
- Soil Moisture Meter.pdf
- Solar Dosimeter.pdf
- Solar Panel Simulator to test circuits.pdf
- Sure Luck Ohms - Resistor Value Identifier.pdf
- Surface Mount Part Ic Codes.zip
- Switchable Test Socket.pdf
- Switched Load To Test Power Supply Reponse.pdf
- Telco In A Box Corrections.pdf
- Telco In A Box.pdf
- Telephone Tester-Off Line.zip
- Temperature Adapter for Multimeter ETI 153.pdf
- Temperature Indicator.pdf
- Test Unit for Sequential Logic.pdf
- Tester For Dip Switches.pdf
- The Wagner Bridge.pdf
- Thermal Resistance Automatic Test Setup.pdf
- Thermocouple interface to micrcontroller.pdf
- TIME -FREQUENCY MEASURING SYSTEM Part 2 73 1973-02.pdf
- Time Voltage Calibrator.pdf
- True Rms Converter.pdf
- True RMS Detector.pdf
- Tweezer Extension.pdf
- Ultrasonic Listener.pdf
- Usimg a DMM to measure capacitance.pdf
- Using Conductance to Check Out Electronic Components.pdf
- Using Tune Up Instruments.zip
- Utility Amplifier - Lab Power Supply.pdf
- Utlilty Amplifier-Supply for the experimenter's bench.pdf
- V & I Calibrator.pdf
- Versatile Tester with Audio Indication.pdf
- Voltage & Continuity Tester.pdf
- Voltmeter for the Blind.pdf
- Water Level Indicator.pdf
- Wavemeter for Hams and CBers.pdf
- Winking LED Resistance Bridge.pdf
- Zero Marking of AC Waveforms.pdf
Contact and submissions
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