Equivalent capacitance for LC low pass filter

Started by amal banerjee in sci.electronics.design2 years ago 8 replies

Could some electronics guru here provide some hints/ suggestions on this problem ? I would like to determine the equivalent capacitance of a LC...

Could some electronics guru here provide some hints/ suggestions on this problem ? I would like to determine the equivalent capacitance of a LC ladder type low pass filter. At low frequencies, the inductors are short circuits, and at high frequencies, the capacitors are short circuits and the inductors are high resistances. Any hints, suggestions would be helpful. Thanks in advance.


Modern replacement for feedthrough caps?

Started by Phil Hobbs in sci.electronics.design1 year ago 16 replies

Hi, all, Some years back, in one of my more inspired moments, I bought a lifetime supply of 1.5 nF Soviet feedthrough capacitors from eBay. ...

Hi, all, Some years back, in one of my more inspired moments, I bought a lifetime supply of 1.5 nF Soviet feedthrough capacitors from eBay. I have about 1,500 of them left, which should be good for building protos till about 2175 AD. Feedthroughs are great because they let you get supply and control wiring in and out of RF shields without trashing the shield effectiveness. They s...


Microcontroller decoupling, >1uF rules?

Started by Klaus Vestergaard Kragelund in sci.electronics.design1 year ago 21 replies

Hi Something that I have been coming back to a number of times: When placing capacitors for decoupling of a microcontroller datasheets...

Hi Something that I have been coming back to a number of times: When placing capacitors for decoupling of a microcontroller datasheets often suggest a 1nF/100nF and maybe a number of them But it needs to be aligned to what is actually the load. Say I have a microcontroller running at 100MHz. Assumption (and that could be wrong), is that for the given technology the switching of the...


LTspice tapped inductor

Started by Clive Arthur in sci.electronics.design3 months ago 18 replies

I have an inductor wound on some 22mm plastic pipe, so essentially air-cored. It's over 120 turns, 700mm long and uses resistance wire. It's...

I have an inductor wound on some 22mm plastic pipe, so essentially air-cored. It's over 120 turns, 700mm long and uses resistance wire. It's about 12uH. There are 30 capacitors connected evenly along the coil commoned to a copper pipe busbar. It simulates a long, peculiar transmission line. I want to LTspice it. OK, lots of small inductors with some resistance and the capacitors. ...


Tough TIA

Started by John Larkin in sci.electronics.design6 days ago 2 replies

Family. Hiking. Cooking. Eating. I need an electronics break. I'm thinking about a product that measures large (as in 60 feet...

Family. Hiking. Cooking. Eating. I need an electronics break. I'm thinking about a product that measures large (as in 60 feet tall) capacitors, and it needs a tough, hard to damage TIA. AC coupling is fine, and the range is basically audio. Something like this: https://www.dropbox.com/s/mrf7kbvtboktstz/Tough_TIA.jpg?raw=1 One could close a fancy bias servo loop on Q1, but it's hardly...