This simple LED current sensor measures a low voltage drop across a sensing (shunt) resistor. When the voltage exceeds about 10mV, the LED comes on. Two circuits are provided: One for sensing current ...

A voltage multiplier is applied as a high source impedance, 36V, 300mA, 12W LED driver. The high source impedance is ideal for driving power LEDs because it accommodates variations in LED junction ...

In the video embedded below, he shows off a homemade voltage detector circuit that he constructed using a trio of BC547 NPN transistors. ... until reaching the indicator LED.

Every electrical current generates a magnetic field, so a non-contact voltage tester can detect current in a conductor without actually touching it, even if the conductor is insulated. It has an ...

In the video embedded below, he shows off a homemade voltage detector circuit that he constructed using a trio of BC547 NPN transistors. The circuit is pretty simple though very useful all the same.

The current-control resistor for the alarm LED depends on the circuit’s operating voltage and the LED’s maximum current. Normally, 470 Ω is used. The low-cost, industrial-standard LMC555 IC ...

This DIY gas leakage detector is designed for educational and basic monitoring purposes. For critical safety applications, ...

3. Flyback circuit ON phase: The MOSFET is switched on and a voltage is applied on the primary winding through the transistor. Energy is stored in the transformer’s core and the output Diode D1 ...

Suddenly, his personal voltage detector, which was clipped to the brim of his hard hat, sounded an alert, signaling an energized line in his proximity. After he returned, he confirmed that the ...