Meters and Testers

Simple ESR Meter Circuit

Last Updated on January 2, 2024 by Swagatam 56 Comments

In this post I have explained a simple ESR meter circuit which can be used for identifying bad capacitors in an electronic circuit without removing them practically from the circuit […]

LED Brightness and Efficiency Tester Circuit

Last Updated on March 13, 2019 by Swagatam 4 Comments

In this post I have explained a simple LDR brightness and efficiency tester circuit set up using an LDR and a digital Ohm meter. The idea was requested by Mr. […]

Simple 1.5 V Inductance Meter Circuit

Last Updated on January 2, 2024 by Swagatam 22 Comments

Here a simplest yet quite accurate inductance meter is presented, which can be built within few minutes. Furthermore, the circuit can be powered-up with a single 1.5V cell. However, a […]

LM317 IC Tester Circuit – Sort Out Good ICs from Faulty Ones

Last Updated on January 14, 2021 by Swagatam 7 Comments

Here is simple but handy testing circuit for LM317 adjustable voltage regulator IC. I am sure it can be used to test other similar ICs like LM117, LM158, LM358 etc. […]

Satellite Signal Strength Meter Circuit

Last Updated on January 8, 2024 by Swagatam 33 Comments

Here I have explained how to make a simple inexpensive satellite signal strength meter which can be used for aligning dish antennas with local satellites in order to achieve the […]

Accurate Speedometer Circuit

Last Updated on May 30, 2022 by Swagatam 30 Comments

Here we’ll see how a simple yet accurate analogue speedometer circuit can be constructed at home using just a single IC and a few external passive components. The speedometer can […]