Looking for some spare parts on e-bay by accident I came across this very interesting DIY kit.

The full title on e-bay was "M328 Multi-functional Transistor Tester DIY Kit LCR ESR Meter Signal Generator"

It's a multi-functional transistor tester with an automatic detection of NPN, PNP transistors, N-channel and P-channel MOSFET, diodes, thyristors, resistors, capacitors ...
On top of all that it's also a frequency meter and square signal and PWM signal generator.

And all of this for less than 15 euro !

I've found this very interesting project by Beric Dunn, K6BEZ, about an HF Antenna Analyser for under $50

The project is based on a PIC and a dirt cheap DDS module

Check it out at :

https://sites.google.com/site/k6bezprojects/antenna-analyser