Difference in coil design?

Hello,


I'm in little dilemma, I need 680uH coil(for PIC programmer), but there are two types:

So what are the differences between 'normal' and resistor like coil?


(if there is difference, then I already bought the wrong one, resistor like, instead with the core)

Hello there,


A big difference is with the series resistance. The small coated types
usually have much higher series resistance than the frame types.
The frame types usually can handle more current too.
Measure the dc resistance and see what they both measure if you
get another one.

Depending on the circuit, the smaller coil may or may not work. It
depends on several things about what the circuit has to do.
Some boost converters wont start without a low enough resistance,
while others will. Some circuits cant tolerate a bigger resistance
because the losses will be too high.

If you can post your circuit and your coil part number we can tell you more.

Presumably this is for a Junebug?, I would expect either to work fine.

As long as the coil can carry at least 50ma you should be fine.

Hello, it's for Pickit2 and here is schematic.(page 30)

If it should work, then that's in fact not so good...because problem is something else then.

The black one is inductor the other is resistor. Founction is totally diffirent.

Aoner Component said:

The black one is inductor the other is resistor. Founction is totally diffirent.

Click to expand...

They are both inductors, but design is different, as stated above/below.

MrAl said:

Hello there,


A big difference is with the series resistance. The small coated types
usually have much higher series resistance than the frame types.
The frame types usually can handle more current too.
Measure the dc resistance and see what they both measure if you
get another one.

Depending on the circuit, the smaller coil may or may not work. It
depends on several things about what the circuit has to do.
Some boost converters wont start without a low enough resistance,
while others will. Some circuits cant tolerate a bigger resistance
because the losses will be too high.

Click to expand...

Yes...sorry for the confusion...We called the coating one ---color code inductor.

My Junebug is based on the Microchip PK2 and my version uses standard through hole parts.