I hope this is used as an RF choke. If it is in the tank (resonant) circuit, the value is much too high.i intend to use a o.o1 mH for my oscillator circuit which transmits at 160.7 MHz what are the parameters which l need to consider
I hope this is used as an RF choke. If it is in the tank (resonant) circuit, the value is much too high.
Yeah, even as an RF choke, it's too high. It would be operating well above self-resonance.He he~! Yeah, I hope he means uH too.!
Eric
Can you double check your math? I get about 1 uH for that design. One of us lost a decimal place.Get a cheap Bic pen. Take the ink tube out using a pair of pliers or dikes.
These pen barrels measure 0.330" in diameter.
Wind 28 gauge magnet wire on the pen barrel in a single layer, tightly spaced, 18 turns. Apply a little Superglue or the like to keep it from spreading apart/opening up. Then on top of those 18 turns, wind another 17 turns. The finished coil should be 0.230" long, and measure about 9.98uH. You can leave the pen barrel inside the inductor.
Yes, you did.Can you double check your math? I get about 1 uH for that design. One of us lost a decimal place.
Yep, I did. Sorry about that. I used a metric version of the Wheeler formula and must have screwed up the inch to meter conversions somehow. That coil size struck me as being too small for 10 uH, but my intuition is just wrong.Yes, you did.
If it's for the tank circuit of a 160MHz osc, 0.01uH would be more likely, let's say 4-5 spaced windings of silver coated copper wire, airform.i intend to use a o.o1 mH for my oscillator circuit which transmits at 160.7 MHz what are the parameters which l need to consider
Actually, for a 0.01uH (10nH) inductor, 1 turn of AWG 22 around an 0.200" form would do it.If it's for the tank circuit of a 160MHz osc, 0.01uH would be more likely, let's say 4-5 spaced windings of silver coated copper wire, airform.
Wheeler's formula won't work for multilayer coils, which is what I was describing (a 2-layer coil). Wheeler's is pretty handy for single-layer coils though.Yep, I did. Sorry about that. I used a metric version of the Wheeler formula and must have screwed up the inch to meter conversions somehow. That coil size struck me as being too small for 10 uH, but my intuition is just wrong.
It provides a reasonably estimate for a 2 layer coil. In this case we calculate about 8.6 uH. I was just trying to get an order of magnitude estimate to check my intuition that the coil seemed too small.Wheeler's formula won't work for multilayer coils, which is what I was describing (a 2-layer coil). Wheeler's is pretty handy for single-layer coils though.