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As I mentioned on the main dummy load page, it was easy to get the circuit to oscillate. This page is just here to show the circuit that caused it, along with some photos of the oscilloscope, showing the weird waveforms obtained. Circuit DiagramThis circuit diagram is different to the one on the previous page. The capacitor is in a different location. 
PhotographsHere are some photographs showing the various waveforms
measured at the top of the 1R resistor. The multimeter shows the
current in Amps. 
In this photo, we are into the power supply's ripple: 
And with that capacitor removed altogether:  |
