The diode will tend to keep part of the pulse away from those devices, BUT if the inductance rings even one cycle there could still be some voltage get through. But once the switch begins to open there is no connection except through whatever spark may be going on inside the switch. So a diode across the coil connections is the best way to go. You could also use a snubber, which is a resistor and capacitor in series, across the coil. The advantage of a snubber is that it is not polarity sensitive, either direction for connection is OK and works well.Does that include away from the battery and regulator?
The two capacitors serve different purposes. The lower valued one, 0.10 microfarad=100nf, serves to provide a low impedance for the fast edges of spikes, while the higher value electrolytic stablizes against slower but wider pulses. AND the 0.1 capacitors on the voltage regulator ICs are straight from the manufacturers application literature, and I have verified that they are needed most of the time.Added 1 ceramic and 1 electrolytic 50v rated capacitors.
Is this what was recommended to prevent transients to the battery and switch?
there is no high voltage transient but the electrolytic has high peak current. can it damage the capacitor?
The ceramic and electrolytic capacitors should be on the trace before other parts of the circuit. The requirement for being close is for the 0.10 microfarad caps for the voltage regulators. The applications notes usually say within 0.1 inch, about 2mm. But my experience has been that withing 0.25 inch of trace is OK. And those very small caps are simple to place.The ceramic volt reg and electrolytic capacitors need to be laid out on the board as close to the volt reg, SMB and mosfet source?
Most of his threads are leading toward Tesla coils and HV. The HEI coil is just an ignition coil that has improved magnetics. Instead of the old style "can" type coils with no complete magnetic path, the HEI uses a E-I transformer core that has a complete magnetic path. The complete magnetic path adds to the coil output.What sort of interesting othern application have you found for that part?
OK, it is just that any time somebody has an alternative application for something with one intended use I find it interesting. Alternative approaches were a part of my career for a while.Most of his threads are leading toward Tesla coils and HV. The HEI coil is just an ignition coil that has improved magnetics. Instead of the old style "can" type coils with no complete magnetic path, the HEI uses a E-I transformer core that has a complete magnetic path. The complete magnetic path adds to the coil output.
They have for me too. where I served my apprenticeship, we did things with machine tools that other shops wouldn't even bid on because they couldn't think out of the box. I still do the same today with things.Alternative approaches were a part of my career for a while.
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by Luke James
by Steve Arar