A continuity tester is an item of electrical test equipment used to determine if an electrical path can be established between two points; that is if an electrical circuit can be made. This is simple continuity tester circuit diagram.

Simple Continuity Tester Circuit Diagram | Component Tester

simple continuity tester circuit diagram components tester circuit
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Parts List For Continuity Tester Circuit

  • Parts List:- Transistor BC547/548/2n2222 or any NPN Transistor
  • Diode IN4001-4007 1pc, LED any color
  • Resistor 1k, 100k, 100ohm 1pc each
  • 3volt battery (comos Battery/cell) or 4.5Volt(1.5V*3 BAT)
  • Probes red and Black or you can use wire also

How To Make Simple Component Tester Watch the Video

Simple Components Tester Circuit After Some Modification

You can modifiy this circuit for measure volt also you need only two extra components for this one is small voltmeter and second small 2 way switch with the help of this switch you can change the mode components tester to volt tester please follow circuit below

diy component tester circuit with voltmeter

Parts List Of DIY Component Tester Circuit With Volt Meter

  • Parts List:- Transistor BC547/548/2n2222 or any NPN Transistor
  • Diode IN4001-4007 1pc, LED any color
  • Resistor 1k, 100k, 100ohm 1pc each All 1/4Watt
  • 3volt battery (comos Battery/cell) or 4.5Volt(1.5V*3 BAT)
  • Probes red and Black or you can use wire also
  • Small Volt Meter
  • Small 2 Way Switch