Meters & Detectors Archives | Page 8 of 12

Simple Refrigerator/fridge Door Alarm circuit

This is a Simple Refrigerator Door Alarm circuit, it will detect light of lamp in the fridge and alert with buzzer.Small size, easy to make and cheapest. [...]

July 13, 2014Meters & Detectors, Sound Generator1 Comment

Meters & Detectors

Diy digital voltmeter panel meter 0-50V

This is Diy digital voltmeter panel meter 0-50V is 0-50V scale. Display with LED 7 segment. In cost 3$ dollar only, builds simple regulator dc power supply

March 27, 2014Meters & Detectors4 Comments

Meters & Detectors

Simple SCR tester circuit diagram

Simple SCR tester circuit diagram is very useful. We can know location pin on gate lead, anode lead and cathode lead. can also test diode, LED and Triac

March 23, 2014Meters & DetectorsNo Comments

simple high level water alarm circuit diagram

Meters & Detectors

Simple high water level alarm circuit project

This is Simple high water level alarm circuit diagram which we need to build it since: fish pond The water level will drop rapidly. We need to check water

March 18, 2014Meters & Detectors2 Comments

Meters & Detectors

The telephone line status indicator

The telephone line status indicator to prevent the hearing others talk on the phone accidentally and a Protection to making phone calls simultaneously. [...]

January 14, 2014Meters & Detectors2 Comments