Did anyone ever think how quartz watch or radio keep time so good? It uses one special thing called crystal oscillator. This post for Crystal Tester Circuit show how to make small tester to check if crystal is working or not. Tester are made with simple parts like transistor, resistor and capacitor. WARNING: Making electric […]
Meters and Testers
Continuity Tester Circuit
This Continuity Tester Circuit uses two transistor like small switch for checking wire is good or bad. We just need battery and one LED light. One side touches to battery other side touches the wire. If wire is okay, then current connects through and light will ON. That mean electricity flows without stopping. If wire […]
Simple ESR Meter Circuit
This article of Simple ESR Meter Circuit show how to make one tool for checking capacitor in phone, laptop and other device. Capacitor work like small battery and it keep some power inside. We can find bad capacitor without removing it from circuit board and for that we need to use one tool called ESR […]