This is a continuous wave nuclear magnetic resonance apparatus. It is a simple oscillator circuit and amplifier, housed in a biscuit tin.
The circuit is a modified Donnaly Oscillator. It is from the references below. It works well enough but I will improve the signal to noise ratio by having a better enclosure and possibly adding a filter. Any suggestions are welcome.
Original work in "Willingham, F.P. Developing Improved Nuclear Magnetic Resonance Marginal Oscillator Spectrometers for
Advanced Teaching Laboratories. Masters. Thesis, Georgia Military College, Milledgeville, GA, USA, 1988."
The originl Donnally Oscillator is in "Donnally, B.; Sanders, T.M. Simple Transistor Marginal Oscillator for Magnetic Resonance. Rev. Sci. Instrum.
1960, 31, 977–978 "
