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Meters and Testers

How to Measure Transformer’s Current Capacity

Last Updated on June 27, 2025 by Swagatam Leave a Comment

We can use a shunt resistor and ammeter concept to find out how much maximum current a transformer can give, in other words, we are trying to know the current rating or amp capacity of a transformer. What Is Our Goal? We have one transformer, maybe old, maybe no label, or maybe we made it […]

Filed Under: Meters and Testers Tagged With: Capacity, Current, Measure, Transformer

Shunt Resistor Calculator for Ammeters

Last Updated on June 26, 2025 by Swagatam 4 Comments

Ok so here we have one simple calculator which can help us to calculate the shunt resistor value that we need to connect across a normal ammeter when we want to use that ammeter to measure high current, more than its actual range. So normally, ammeter can measure only small current, like 1 amp or […]

Filed Under: Indicator Circuits, Meters and Testers Tagged With: Ammeters, Calculator, Resistor, Shunt

How to Connect Digital Ammeter, Voltmeter Modules M4430, M3430

Last Updated on February 18, 2025 by Swagatam Leave a Comment

In this post I will be talking about the Chinese M4430 digital ammeter, voltmeter module which is a really neat, compact digital meter that you can mount on a panel. Whats great about it is that it is designed to measure and show us both the DC voltage and the current at the same time. […]

Filed Under: Meters and Testers Tagged With: Ammeter, Connect, Digital, M4430, Modules, Voltmeter

How to Measure Very Low Current [Circuit Diagram]

Last Updated on February 9, 2024 by Swagatam 3 Comments

very low current measuring meter circuit

Accurately measuring very low currents of a few microamps or less using a regular panel meter or multimeter is not feasible. To make such precise measurements, you need to employ an active circuit, like the one depicted here. This circuit low current ammeter circuit can be constructed as a self-contained unit or integrated into an […]

Filed Under: Meters and Testers Tagged With: Current, Measure, Very

Accurate Transistor Tester Circuits Explored

Last Updated on February 13, 2024 by Swagatam 12 Comments

transistor tester circuit diagram

In this article we talk about a few simple yet accurate transistor tester circuits which can used to identify whether a transistor is good or bad. Note: Please test *only* BJTs and MOSFETs (enhancement or depletion) with these circuits. Simple Good/Bad Transistor Checker using a Single LED Do you have a lot of strange old transistors […]

Filed Under: Meters and Testers Tagged With: Accurate, Circuits, Explored, Tester, Transistor

Simple LED Forward Voltage Drop Tester Circuit

Last Updated on May 6, 2023 by Swagatam Leave a Comment

amber LED testing

Semiconductor LEDs (Light Emitting Diodes) produce light when current flows through them. In comparison to conventional lighting sources, LEDs offer a number of benefits, including high energy efficiency, extended longevity, and low thermal output. The forward voltage drop of an LED is one of the important factors that affects how well leds performs. We will […]

Filed Under: Meters and Testers Tagged With: Drop, Forward, LED, Simple, Tester, Voltage

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