Tom Herbison has developed an excellent test equipment using the raspberry pi.
This can be used to measure crystal frequencies, filter performance etc..
Tom's blog contains all details about this nice project.
Raspberry pi wobbulator needs 2 more plug in boards
1) AD9850 DDS Module
2) ADC PI Module
and an envelope detector (seems similar to the one used in the old AM broadcast receivers)
AD9850 module is available in e-bay.
ADC PI is a product of ab electronics.co.uk.
Since raspberry pi has GPIO pins, it will be easy to interface a graphic lcd. Once the wobbulator program is modified to display the data in lcd, then the raspberry pi wobbulator become a handheld device.
Nice idea uhhh??
This is time to take raspberry pi out of the shelf. Or maybe it's a good idea to keep this project for next year. :)
I have tried couple of Linux distributions in raspberry pi. Used my 32inch Samsung television as the monitor. Raspberry pi needs at least 700mA , 5V power supply. I used my Samsung galaxy mobile charger to power the pi. This credit card sized computer is a good choice for people who want to try Linux.