I'm wondering if anyone has done this and how:
I want to resonate a high carbon steel bar at its fundamental frequency to produce an audio tone. The bar is 1/8" thick, 6-1/2" long and 1-1/2" wide and resonates at about 400 Hz when struck.
The bars are supported at their "nodes" and do resonate nicely.
What I'd like is a circuit to get it producing a continuous sine wave. So far I haven't had much luck getting enough feedback to produce oscillations using a simple circuit similar to a tuning fork oscillator. (think Buliva "Acutron" watch circuit but with a high current supply and a power transistor)
I want it to work with a plain steel bar - no magnets attached to the bars nothing in contact with the bars and preferably a simple one transistor low tech circuit -