Electronics-Lab.com Blog

Mark Rehorst build his own Van de Graaff generator and documented the procedure on the article below. Van de Graaff generator is a device capable of producing high voltages by collecting electrostatic charges on a large metal sphere. The high voltage generated is able to make peoples hair stand up! Check the article below for construction details.  [via]

DIY Van de Graaff generator - [Link]

A variable DC power supply is one of the most important tools for an electronics hobbyist. In order to carry out an experiment you need a reliable DC power source that can be varied according to the need of the experiment. Last week I felt I must have one on my workbench, and thought to make one for myself. This design is very simple but is great for powering almost all kinds electronic projects. It uses LM350 (a 3-pin IC) to generate a variable DC power supply. I would recommend to read the datasheet before doing this project.

Variable DC Power Supply (1.25 – 18V) using LM350 IC - [Link]

LED’s are great display tools. Their prices have decreased to a point where they are replacing more conventional light sources. In one sense their characteristic need for low voltages is an advantage e.g compatibility with I.C drives, but this voltage requirement can also be a disadvantage. I wanted to light some LED’s in a simple sign application, nothing fancy, but I needed to decrease the utility line voltage to a LED-compatible value for this application.

A power source for simple LED projects - [Link]

The microcontroller used is 0822 zilog encore! 8k series (soic,28pin) as shown on the figure. Is a programmable microcontroller, the functions used are the GPIO and the UART of the chip. GPIO is used on led indicators, and the UART is used for giving and reading AT COMMANDS to control the Bluetooth device.

MCU controlled Bluetooth automation with infrared sensor - [Link]

This easy as well as cheap but effective device is mainly intended for your ease to leave your fish autofed. You need no longer worry your fish would starve as this autofeeder would replace your job. This autofeeder device will expell pellets by quantity as well as time intervals as you like. Besides, making this circuit seems to be a bit entertaining as you are insisted to make it yourself and so It would develop your creativity.

Centrifugal fish autofeeder - [Link]

This circuit controls resistive and inductive loads up to 2,500W. Its main functional device is an integrated phase control circuit – Siemens TLE3103. It contains its own power supply, a zero voltage crossing detector circuit and a logic driver. An additional feature is the low voltage input to enable/disable triac firing enabling/disabling the logic driver.

2500W Phase Control - [Link]

Pulse Generator kit will generate a frequency in KHz which can form a good test gear project. This kit is based on the classic LM555 timer IC.

Pulse generator - [Link]

This project was designed and constructed as enhancement to the 0-30V Stabilized Power Supply Project with the DIY electronics hobbyist in mind. The circuit uses a single PIC Microchip to perform the Voltage, Current and Temperature conversions and display functions. The PCB Board uses large tracks and can easily be made using the “press-n-peel” method and a hobby drill. Components should be readily available anywhere in the world. Furthermore the hex files are available for the PIC16F877A and the PIC16F887 and the display can either be LCD or LED.

Digital Volt and Amp Meter with Temperature Control - [Link]

The following circuit Diagram of (DUAL VOLTAGE POWER SUPPLY ) can be used for Misc.. application. It requires a few components to built. The most important components of this circuit are REGULATORS. 1 : (AN) 7812 and 2 : (AN) 7912 AN7812 is the Positive Voltage Regulator.

Dual Voltage Power Supply – [Link]

Cheap Audio Booster - [Link]