It took a lot of back-and-forth testing to figure out the first try at the continuous GCM.

The big problem I ran into was that I was trying to test it at 120VAC. Well, with the two-diode rectifier configuration that means that the average voltage is only 60VDC, so it basically wasn't working at all. Only when I realized that for testing I was going to need to halve the primary series resistance did things start working better.

One issue is that the LM334 does a better job of regulating the current if it's fed DC, so I'm going to add a 10µF ceramic cap across its input. But the bigger issue is that the pass transistor gate for the power supply sees a smooth ramp as you alter the ground impedance. That's not gonna fly - we need sharp transitions. So I will need to add a Schmidt trigger buffer.

The hope is that the next set of boards will have a turn-on ground impedance of around 10kΩ and a turn-off of just under 20kΩ.