All posts in the 'Measurement projects' Category
Posted on 29 Jul 2008
This is a low power voltmeter circuit that can be used with alternative energy systems that run on 12 and 24 volt batteries. The voltmeter is an expanded scale type that indicates small voltage steps over the 10 to 16 volt range for 12 volt batteries and over the 22 to 32 volt range for 24 volt batteries. Power consumption can be as low as 14mw when operated from 12V and 160mw when operated from 24V.[more]
Posted on 28 Jul 2008
A student from the Swiss Federal Institute of Technology (ETH Zurich) has built a portable electrocardiogram (ECG) unit powered by solar energy. This system is intended for use in developing countries. The system has been named ‘Kadiri’ which means ‘make possible’ in the Tanzanian language Kiswahili. The idea for such a device came to the German student two years ago while he was visiting Tanzania. He worked for an hospital, fixed broken computers, and decided to develop a robust, affordable and energy-efficient ECG unit to be used in poor countries. [more]
Posted on 27 Jul 2008
The counter is sensitive enough to detect background radiation. In addition you can enhance the basic Geiger Counter by adding a Digital Meter Adapter, RS-232 Adapter with free Windows Radiation monitoring program or a Randam Number Generator. The windows 98/XP radiation program is free and available for downloading.[more]
Posted on 24 Jul 2008
The hart of this receiver is a TV or VCR tuner. The tuner is a digitally type, which means that the received frequency should be programmed into the tuner via I2C interface. The smallest stepsize of a tuner is 31.25kHz, 50kHz or 62.5kHz. This is far to wide stepsize, specially if you are looking for narrow band signals. To solve this matter I have added a second mixer using a DDS as osc. With the DDS you can step inside the 62.5kHz, 50kHz or 31.25 kHz window. The smallest stepsize this DDS configuration can perform i 0.01Hz. [more]
Posted on 21 Jul 2008
The PicoDopp is intended for amateurs and hobbyists, ( technical people ) and also for engineering folks with an application that requires a Doppler DF “sensor”. The PicoDopp DF consists of 6 OEM PC boards that are assembled and tested, but they are not assembled into a finished DF instrument. Additional work by the user is required, involving some construction skills and tools. The user must also provide an FM receiver, an antenna platform, a display computer, and all the interconnecting cables. [more]
