Electronic – Are these capacitors

capacitorcomponentsinductor

I've salvaged these parts from audio system. Both have two contacts. Under the blue thing, on the PCB plate there was "L704" and one loop symbol, which makes thing this is an inductor – what are it's properties then? It has two red dots on top and one black on the side. The black one has " 303j" written on it's top – I guess it's a 30nf (though meter showed nothing – it's blown) cap, but what type is it? It also has a bracket on top which indicates the negative electrode. Or the positive one.

Best Answer

No, these are inductors.

The "303" is very likely a 30 * 10^3 = 30 000 nH = 30 uH inductor

The other one has two red dots and like resistors red stands for 2. This could be a 22 uH inductor or 2.2 uH.

You can check that these are inductors using a multimeter on ohms range, at DC inductors have a low resistance. If these were capacitors you'd measure in infinite DC resistance (unless the capacitor is broken).

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