Links open in new windows.
A single piston Stirling Engine
(Youtube video clip).
Violin pickups.
A very effective piezo pickup for violins, great value.



Anyone building a RF linear amp and needing to tinker with the tuned circuit values really should look here. 'So very helpful.
http://www.radiok8kk.com/pb/wp_86ce2418/wp_86ce2418.html
Use the programme and the documentation.

THE links page
for radio amateurs.
If it isn't there it may not exist.