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Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?
- posted
2 years ago
Can anyone explain how this battery charger works?
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- posted
2 years ago
What else might that yellow thing be, other than a capacitor?
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- posted
2 years ago
A thermistor or a VDR, to provide current limiting. Regarding operation, power diodes tend to have a higher Vf than small signal diodes or transistor junctions, so once the diode goes into conduction it produces a large enough voltage to turn on the transistor and the red LED, indicating that charging is taking place. The green LED merely indicates that power is applied to the circuit.
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- posted
2 years ago
My (probably futile) hope was that he might answer it himself, or at least try to...
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2 years ago
Sorry, I should have checked the provenance of the thread more carefully. Apart from that, I couldn't resist the chance to show off. :-)
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- posted
2 years ago
My guess - a polyfuse?