What device is it ?

[bianchi77]

Everyone,

I'm wondering,
What device is it ?
Please have a look on the photo.
On my meter it's 0.31 ohm...

Is it a balun or miliohm resistor ?

Thanks

[budm]

Re: What device is it ?

Just a very small inductor made by putting the wire through two FERRITE beads.
http://www.feryster.pl/polski/bdw.php?lang=en

[bianchi77]

Re: What device is it ?

ferrite bead core, ok, thanks, similar like on power supply charger bead...

[bianchi77]

Re: What device is it ?

@budm
anyway I've made MC34063 running on 3Kohm RL and 220V but it's not stable..
could it be the inductor too small ? my test is using 333 coilcraft smd inductor 33uH...
it's releasing heat too much with in a minute and voltage drop rapidly...
f = 40.4 KHz, I checked with scope..
8W 220V neon bulb is very bright now...in calculation it's more than 16W with that experiment circuit..
FET = 62N25 savage from samsung power supply unit,
Following the formula from ST datasheet, the lower the value of inductor, the higher Iout, but I need a bigger rating of inductor ( big wire ) correct me?
https://www.youtube.com/watch?v=0XWUl3fcuTc