15-09-2018, 05:23 PM
The field coil will be largely resistive but somewhat inductive. That means a fair size voltage spike during flyback. I've driven field coils with current feedback using a sense resistor. This ensures a very linear scan.
The line coils are another matter. Here the inductance will nearly always be dominant so the voltage waveform will be almost constant during the scan and a sharp spike during flyback. If you want very linear scan you can use current feedback but the amplifier will have to be able to deliver a high voltage. It may be easier to use classic line output methods, probably with a FET and energy reovery diode.
The line coils are another matter. Here the inductance will nearly always be dominant so the voltage waveform will be almost constant during the scan and a sharp spike during flyback. If you want very linear scan you can use current feedback but the amplifier will have to be able to deliver a high voltage. It may be easier to use classic line output methods, probably with a FET and energy reovery diode.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
