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AC-coupling cap for AC inductor drive

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ricko_uk:
Also...
I just simulated the same circuit in Altium (see attached pictures) and ran a AC analysis to play with the values but the output comes out a weird shape with ringing and totally wrong/different frequencies...?
Any idea what's going on?

Prehistoricman:
I don't know why your simulation looks odd, but I have figured out why my original graph looks so different.
The inductor's series resistance matters A LOT to the behaviour of this circuit. I seem to have made it 8 ohms in the original post, probably by mistake.

Parasitics matter!



--- Quote from: ricko_uk on March 22, 2020, 05:21:20 pm ---you mean better frequencies would be slightly higher, perhaps 500KHz with reference to your graph?

How do I shift the inductor's down-going slope further to the left so that 200KHz is on the steep part of the downward curve like you suggested?

--- End quote ---
Yes. Between 200 and 500.

Resistor value and inductance affects the location of the ideal region. Series resistance to the inductor seems to reduce the size of the ideal region.

Zero999:
How about an RL oscillator, using the 555 timer? The inductor is an air core coil with a large enough surface area. There are various calculators for the inductance of an aircoil on the Internet. Ferrous metals will reduce the frequency and non-ferrous increase it.

ricko_uk:
Thank you PrehistoricMan and Zero999! :)

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