build a modified green laser pointer

The circuit below is similar to the one above but can be used with a laser pointer to toggle the relay rather than a push button. The IR photo transistor Q1 (Radio Shack 276-145A) or similar is connected to...

For the wiring of the display, the ribbon cable is first taken and soldered according to the circuit diagram on the 25-pin sub-D (parallel port) plug. The small circuit diagram illustrates the rear side, which is the solder side...

This project is designed to charge a pair of AA Nickel Metal Hydride (NiMH) or Nickel Cadmium (NiCd) cells using a laptop's USB port for power. It addresses the need for a convenient charging solution. Any USB port can...

The article describes the process of building a charger controller board and programming the AVR microcontroller. A Li-Ion battery is needed for practice; the example battery mentioned has withstood considerable abuse. Knowledge of the battery's specifications, such as maximum...

This chapter contains circuit diagrams for several power supplies for pulsed solid-state lasers. These include units suitable for driving the popular Hughes ruby and YAG rangefinder laser assemblies, one utilizing the flash from a disposable pocket camera, and a...

Circuit T operates on the principle of utilizing a laser diode LED as a light emitter. This circuit incorporates a laser diode that serves similar functions as a light-emitting diode. It features a resistor (R) and a diode (VD)...