The simple Diode and LED Tester presented here costs ... so you could damage it if you are using a 9V battery for testing. Diode and LED ... On balance it was decided that a simple circuit, ...

It’s late at night. The solder smoke keeps getting in your tired eyes, but your project is nearly done. The main circuit is powered by your 13.8 V bench supply, but part of the circuit needs … ...

In this post, two LED blinking circuits are given below. First one is dancing bi-color LEDs (two different color LEDs) where the two color LED will run in sequence. In the second circuit, we will ...

This is the first basic LED circuit I built many years ago in my school days and had given me immense pleasure to see glowing LED. For building this circuit you only need four things: LED- 1; Resistor ...

In this simple but effective project, you will learn how to make a simple circuit using a 9-volt battery, LED, and pencil drawing. This project is a fun way to explore and learn about the science of ...

This is a simple blinking led circuit powered from 220V that can be used to mark special places or as voltage indicator. The voltage from the mains charges the capacitor through R1 resistor and D1 ...

Battery 9v . Circuit Diagram. Laser Diode Driver Circuit. A Laser Diode driver circuit is a circuit which is used to limit the current and then supplies to the Laser Diode, so it can work properly. ..

For this application, the LED proved to be a decent reference diode. It has a temperature coefficient that tracks fairly well with that of Q1, and the LED reaches its turn-on knee with less current ...

In production, this may be replaced with a zero Ohm resistor. The open circuit protection circuit shown utilizes R9, causing it to serve an additional function, in conjunction with Zener diode D2. In ...