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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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