kripacharya
Banned
I have some legacy circuits with air core inductors (copper) w/ 19 turns, SWG = 24, dia = 3.20 mm, Length = 12 mm. The measured inductance on a good instrument was 80nH/13.7 milliohms & 93nH/13.37 milliohms.
However, calculations show that it *should* be 272nH, using outer dia, and ~185nH using mean dia.
I need to replicate this board. But what value of L (also Q and C) to choose ?? This is a very simple board for an antenna amplifier for MW/SW/FM bands which works very well - gives > +20dB all the way from 500Khz upto 125MHz FLAT (based on simulations), and I don't want to mess it up.
What is the community opinion/ advice ?
However, calculations show that it *should* be 272nH, using outer dia, and ~185nH using mean dia.
I need to replicate this board. But what value of L (also Q and C) to choose ?? This is a very simple board for an antenna amplifier for MW/SW/FM bands which works very well - gives > +20dB all the way from 500Khz upto 125MHz FLAT (based on simulations), and I don't want to mess it up.
What is the community opinion/ advice ?