Tools and measuring circuit diagrams

Pulse-Generator & Signal-Tracer

Dual-purpose test-instrument. Very simple circuitry, 1.5V Battery-operated

Logic Probe

This logic probe uses a single CMOS 4001 IC and can display high, low and pulsing outputs.

Live-line Detector

Detects the presence of a live mains conductor Minimum parts counting

Digital Remote Thermometer

Remote sensor sends data via mains supply Temperature range: 00.0 to 99.9 °C

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.

Self-powered Fast Battery-Tester

Tests 1.5 to 15 Volt cells Two-LED display, no power supply required

Ultra-simple Voltage Probe

Detects 1.8 to 230 Volts DC or AC Minimum parts counting

E-B-C Transistor Pin Identifier

Tests transistors and diodes for polarity. Simple circuitry - 9V Battery operation

LF Crystal Controlled Oscillator

The RF engineer sometimes has to look for an instrument that will check a low frequency quartz crystal unit reliably and rapidly. This is a difficult piece of equipment to find and the engineer often has to consult an electronic circuits handbook for the schematic of a circuit that will perform the task.

Circuit Board Tester

Indicates the basic integrity of a printed board. Self-powered - 3 to 30V range.