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Simple Logic Probe Circuit using Transistors

Last updated on 12 July 2025 by Admin-Lavi Leave a Comment

This article for Simple Logic Probe Circuit using Transistors tell how to make one useful tool called voltage tester. It uses two transistors for checking if some place in circuit have positive voltage. When it find electricity it makes beep sound and small light turns ON. People who want to learn electronics, this tool will […]

Filed Under: Meters and Testers, Transistor Circuits

Tester Probe Circuit

Last updated on 12 July 2025 by Admin-Lavi Leave a Comment

Many people think multimeter can test any electric part. But this not always safe especially for semiconductor. This article for Tester Probe Circuit show how to make one easy and safe tester only for semiconductor. This tester is easy to build and uses small current which is good to test many type of semiconductor. What […]

Filed Under: Meters and Testers, Transistor Circuits

Crystal Tester Circuit

Last updated on 12 July 2025 by Admin-Lavi Leave a Comment

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 […]

Filed Under: Meters and Testers

Continuity Tester Circuit

Last updated on 12 July 2025 by Admin-Lavi Leave a Comment

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 […]

Filed Under: Meters and Testers

Simple ESR Meter Circuit

Last updated on 12 July 2025 by Admin-Lavi 2 Comments

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 […]

Filed Under: Meters and Testers

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