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

Signal generator using AD9833 DDS chip

Signal generator is handy tool in lab. But in some areas of electronics it’s not so important to deserve money to be spent on. And so you can always rely on your skills and build your own DDS signal generator out of few common parts. Tuomas built an AD9833 based DDS signal generator. This is a specialized chip from Analog Devices which is capable of generating sine, triangle and square waves at frequencies from 0.01Hz to 3MHz. It has to be controlled using SPI interface. This is where AT90USB162 comes in. It takes care of giving commands to DDS chip, and talk to PC using USB interface. He has written a handy GUI using Python where signal parameters can be easily changed. Continue reading

Portable LCR meter on PIC microcontroller

LCR meters are included in professional measuring instruments are quite expensive to purchase. So if you need one and don’t want to spend too much money on that – the only way is to build one. This LCR meter is based on dsPIC30F4012 microcontroller. Device can be used to analyze the analog performance of any analog device. LCR meter combines various techniques like DDS signal generation, DSP algorithms to evaluate analog signal properties. Information is displayed on graphical LCD. Project description can be downloaded here [MT1769_Abstract]. Continue reading