Inductors, Coils, and Chokes - Insights

Need to avoid THT parts (talking about power inductors, more then 5 Amps)

Small compact SMD components. New Ferrite & other materials.

Surface mount technology - as opposed to previous thru-hole.

I don't know, I gave up looking when I couldn't find a 7 microhenry to 7 microhenry transformer, which would have been advantageous to my musical instrument.

I've seen several on your web site lately that were impressive.

Vishay and Wurth are quite good..

RF-filter, divide electronics in smaller parts to suppress radiation, separate electronics from wires by use of self resonance in common mode choke, convert unbalanced signals to balanced signals by use of common mode choke.

1) Used in low voltage AC/DC Adopters. 2) Used in Audio Circuits. 3) Used in Hi Fi Speaker systems. 4)Used in RF Amplifiers. 5) Used in UPS & Inverters. 6) Used in Signal Mixing & Filtering. And a lot more.

Noise protection, oscillators, pulse shaping, tuned circuits, timing circuits, linear waveforms, ferrite beads, high voltage, etc.

In what would not be recognized, they could be thought of as the series of sensors that measure both the electric & magnetic fields from nuclear weapon explosions, both real & simulated as we tested, various war planes, the Minuteman fleet silos for penetration (& survival) of EMP,, ElectroMagnetic Pulse. The measurements of nuclear bomb tests in NTS use 6 inch air-nitrogen filled co-ax cables that must be carefully compensated with inductors (chokes) etc to handle the alpha signals to the 6 GHz oscilloscopes -- etc.

Inductors go from microhenries on up through henries. Capacitors go from microfarads on up to farads...they can actually be used to generate audio frequencies that can thereby be amplified with a transistor amplifier and reverbed through an op amp.

I think all applications are Standard until we have used for them.

Typical error is saturation, which results in overheating, progressive deterioration of coil insulation & eventual failure in many circuits. Poor design, poor reliability, short MTBF.

A large coil in front of a SMPS can easily give some instability problems, so a workaround has to be made.

Selection of replacement or x-ref parts made by purchase office, without asking the technical office.

GlobalSpec should database all the different catalogs together instead of me having to sign into each one. Perhaps open source the idea too so that each part can be cadded (perhaps via freeware), and then people could start making instant royalties off of building an e-kit out of the cadded parts on the master database.

Core with low magnetic radiation. Magnetically shielded. Broad frequency range 0 - 2.5GHz. Low DC resistance. Size 0402 or smaller.

Improvements in core materials, ( B-H curve ) more efficient, higher flux density per weight of core ( "steel" ).

Better datasheets would be nice. Difficult to design SMPS when you do not know the loss at higher frequencies.

1.Compact Inductors for high current applications

Comprehensive, clear and fast to use selection charts.

Less weight, smaller size, easy connection

Extremely low DCR to minimize Power loss.

Inductance, rated current, smaller size

Small and Inexpensive with less steel

Tolerance should be very low

Rf coils smd

"Magnetics", magnetic phenomenon is not well understood by many -- indeed, many that should understand it. There are more things that must be known to use these things well, not just Om's Law.

Now days most commonly the inductors are available for any application, we need not take pains to design these inductors except for few instances where we need to design the inductors.

Select as per the specific requirement & from standard / Trusted Suppliers.

Yes, read the data sheet very well

Must see the magnetic properties of Stamping Core material & Ferrite composition.

Be aware of multiple filtering inductors placed side-by-side in your layout.

Read very well the values when the coils are with colors code.

Understand the B-H curve, & ferrites in general.