During spare time I made quick design of TTL to RS232 adapter, that works with my AVR development board. This adapter helps to connect TTL (Transistor-Transistor Logic) level signals to RS232 interface. TTL side is 9-pin female connector and RS232 sire is male connector.
Unit is powered from target board using power pins.
The RS232 TTL adapter [...]

Usually we are used to connect LCD displays to 5V systems. As LCD controllers usually require 5V power supply there must be some compliant circuitry used when interfacing to 3V systems like ARM LPC2000 microcontrollers and so on.
Here are few examples how this problem could be solved.
Solution number1:

Standard LCD microcontroller can work with lowered power [...]

Check this out the new cheap handy tool for multi purpose works. Poscope is affordable (now for 70EUR) instrument that includes:

2 channel Oscilloscope with markers, triggering, filtering etc.;

2 channel Spectral analyser with markers, filtering etc ;

2 channel Chart recorder with markers (up to 99), recording with up to tens of hours etc;

16(8) channel Logic analyser [...]

Lets go through few examples how to place electronic parts correctly on PCB board.
SMD electronic parts especially if lead pitch is above 1 mm, then placement of leads has to be symmetrical on copper planes:

If IC has smaller lead pitch like 0.5 – 0.8mm positioning by hand become harder. Sometimes it is recommended to use [...]

It is convenient to drive dot LED matrix displays using IC drivers of 5×7 dot LED matrix’s like MAX6952 and MAX6953. These two IC’s differ only by data interfaces: SPI for MAX6952 and I2C for MAX6953. In this article you will se how these driver IC’s can be controlled by computer using LPT port.
Program provided [...]

Endoscopy is known to be used in medicine, but it can also be used in other areas of industry like electronics.
In big electronic industries where investments are huge, the requirements to quality are also big. In big industries there are automatic testing using. This allows to achieve maximum quality with minimal cost. In smaller industries [...]

This circuit is originally published by Elana Lian and Chan Tran (Analog Devices). This simple single supply system which enables to measure remote temperature with less than 1°C error in a range of 0 to 100°C:

Circuit consists of following parts: T1 – low cost AD590 temperature sensor; AD8541 – rail to rail amplifier; four resistors; [...]

Today electronics is shifting to SMT (Surface Mount Technology) or SMD (Surface Mount Devices) area. DIP domination has left behind.

They won’t be vanished from electronics industries as there many areas where they are and will be successfully used. But as electronic circuit complexity grows, demand on PCB miniaturization increases there is no other way as [...]

Making PCB at home is time consuming matter. How to make prototype PCB fast at home require some skills. I bet fastest and messiest thing would be using resist-pen and paint track directly on PCB board. But this process is limited by complexity of your circuit. More complex your circuit is – more mistakes you [...]

Sound wave can be sensed by using sound sensor. If you are designing some kind of robot, sometimes it is useful to enable sensing of sound. Then you can program your robot to follow your voice commands. In some cases sound wave sensors are used as collision sensors. Sound wave sensor is a microphone. Microphone [...]