Hi all!
My landline phone's speaker broke the other day because "someone" threw it at the floor. The phone has 2 speakers, the ringer speaker (big black circle to the right) and the speaker you put next to your ear (right below the circle, it's one you solder there with 2 cables), which is the one broken. It was still working but the sound was distorted and rattling. The phone model is a Panasonic KX-TGA161R.
I disassembled it and saw that it was a 20 mm speaker. I also tested the DC resistance of the coil and I was reading 130 ohm steady. That's the first thing that bugged me, as I was expecting something between 8-32 ohm. May be one of the things broken is precisely the coil cable that is damaged and should read a much lower value. Basically, if you look for 20 mm (0.79 inch) speakers, 99% of them are between 8-32 ohm.
Sadly, the speaker has no way to identify it, it had printed in the back some letters but they are erased and can't tell a single character. Also, I've seen there's another parameter, watts, and the 20 mm speakers come in 0.5W, 1W, 2W... I don't know which one should I choose. The speaker looks like this:
So, basically, I don't know what parameters should I choose. I don't know neither the wattage info. You need it to be 20 mm diameter, that's fine. Then the DC ohm gives you an idea of how loud it will work, but watts seems like extra info. I'm not at all a speaker savvy, but I thought in these specific scenarios, speaker diameter and DC ohm would give you all the parameters needed. No inductance, no power, no core permeability, no winding self-capacitance...
My landline phone's speaker broke the other day because "someone" threw it at the floor. The phone has 2 speakers, the ringer speaker (big black circle to the right) and the speaker you put next to your ear (right below the circle, it's one you solder there with 2 cables), which is the one broken. It was still working but the sound was distorted and rattling. The phone model is a Panasonic KX-TGA161R.
I disassembled it and saw that it was a 20 mm speaker. I also tested the DC resistance of the coil and I was reading 130 ohm steady. That's the first thing that bugged me, as I was expecting something between 8-32 ohm. May be one of the things broken is precisely the coil cable that is damaged and should read a much lower value. Basically, if you look for 20 mm (0.79 inch) speakers, 99% of them are between 8-32 ohm.
Sadly, the speaker has no way to identify it, it had printed in the back some letters but they are erased and can't tell a single character. Also, I've seen there's another parameter, watts, and the 20 mm speakers come in 0.5W, 1W, 2W... I don't know which one should I choose. The speaker looks like this:
So, basically, I don't know what parameters should I choose. I don't know neither the wattage info. You need it to be 20 mm diameter, that's fine. Then the DC ohm gives you an idea of how loud it will work, but watts seems like extra info. I'm not at all a speaker savvy, but I thought in these specific scenarios, speaker diameter and DC ohm would give you all the parameters needed. No inductance, no power, no core permeability, no winding self-capacitance...