Have you ever wondered how a quartz watch or radio maintains perfect time? It uses a special part called a crystal oscillator. This post shows you how to build a simple tester to see if crystals are working properly. The tester itself is built with common parts like transistors, resistors and capacitors. WARNING: Building circuits […]
Meters and Testers
Simple Continuity Tester Circuit
This tiny tester uses two transistors which resembles tiny switches to check the wires quality. You only need a battery and an LED light. while touching the battery with one tester and a wire with the other. If the wire is in good shape electrical current will flow and the light will illuminate. This indicates […]
Simple ESR Meter Circuit
This article explains how to construct a tool for monitoring capacitors in devices like phones and laptops. Similar to a small battery a capacitor is used to store power. One can identify defective capacitors without taking them out of the circuit board by using a device known as an ESR meter. To detect minute changes […]