Hello,
My daughter has a toy portable phone that was given to us. There's no sound. We tore it apart and the circuit board where the wires are soldered was broken off the speaker. There weren't any markings on the speaker at all, but I found a set that look identical, except they have the wattage and resistance on them. They're the same physical size as the original and are 0.25 watt, 8 ohm.
I soldered the new ones in and there's still no sound. I first want to test the speakers to see if they're good. I'm going to test the continuity between the two pads and make sure there's no short. If there isn't, I was going to apply some voltage to the two pads to see if I heard anything. But what's the right amount of voltage? I don't want to damage them.
I figure if I put the right amount on, I should hear something. If the speakers are good, I'll check the transistor that's right by the wires on the circuit board. I think that transistor is being used as an amplifier.
Thanks.
My daughter has a toy portable phone that was given to us. There's no sound. We tore it apart and the circuit board where the wires are soldered was broken off the speaker. There weren't any markings on the speaker at all, but I found a set that look identical, except they have the wattage and resistance on them. They're the same physical size as the original and are 0.25 watt, 8 ohm.
I soldered the new ones in and there's still no sound. I first want to test the speakers to see if they're good. I'm going to test the continuity between the two pads and make sure there's no short. If there isn't, I was going to apply some voltage to the two pads to see if I heard anything. But what's the right amount of voltage? I don't want to damage them.
I figure if I put the right amount on, I should hear something. If the speakers are good, I'll check the transistor that's right by the wires on the circuit board. I think that transistor is being used as an amplifier.
Thanks.
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