Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

Dual power supply with digital control

This is another great power supply project. It uses a center tapped transformer, so two choice of two channels is obvious. One channel produces positive 0 to 30V another negative from 0 to -30V. It also has adjustable current limit from 0 to 10A. Variable voltage part is used from his previous simulations. They are similar for positive and negative sides.   Controlling is performed by using Atmega328p microcontroller. Instead of potentiometer there are couple DACs used MCP4821. Microcontroller allows setting precise current limit and voltage. Updated information is displayed on LCD screen. And of course it is always good idea to add constant voltage regulators. Kerry added 12V, -12V and 5V that may be used right away without any settings. Continue reading

The Unbeatable Atmel STK500 EVB

Talking about the Atmel STK500 EVB, how many of you here ever get in touch with it before? For those that involved with it before, then it’s great for you, while for those that didn’t know what’s all about, you should spare a few minutes and read this on… Believe it or not, the Atmel STK500 EVB is by far one of the unbeatable starter kit development system. It equipped with these following great features: Eight switches; Eight LEDs; A variable; Software programmable AREF voltage; Variable power supply. Basically, the Atmel STK500 EVB board is already included with DIP sockets for all AVRs. The best part about it is the STK 500 EVB equipped with an ATMega168, which is very awesome indeed! Today, you’re going to learn how to configure the Atmel STK500 EVB as an Arduino-based development system board. As you see that the STK500 is requiring to be wired and the jumper must set as shown in the below figure: By the way, you should be aware that in case the PC doesn’t have a serial port but… Continue reading