Ultra-inexpensive Charger disassembly

This is a year ago to buy the ultra-cheap charger, the reason to buy is because a non-intelligent charger, and this charger work full of fresh, battery clamp is also good, asking price is 8.2RMB, it is rare to see the quotation with the hair of it. Used for a period of time, also used to measure its charging capacity: a single-section charge of about 120mAh, today finally can not help to dismantle.

Good lift-lid design, the lid can protect the battery clip as little as possible to stick ash and be oxidized, this is not my nonsense, cheap charger can not use good contact, I have a cheap charger, is not cover, the results of a few months on the oxidation, the lid is a conjoined design, so that people will not be lazy, bought 1 months, A lot of times, the contacts are still very new.

Very good negative contact point, strong elasticity.

It was a classic cheap charging circuit. Half-wave charging with diode indication. Unfortunately, this plastic is too weak, I screwed the screws, three screws pile on two pieces, I thought I could stick, the result of 220V rotary plug behind the plastic is also broken, this is completely finished.

Very small transformer, and very light, at first I also fancied that this light is not with the switch power Ah, hehe. Only 3 W transformers are estimated.

Simple circuit, two diodes (a quilt cover in the insulation casing inside), two LEDs, two resistors, 8.2 yuan can sell, not my DIY generation can reach ...

This is the circuit diagram. People who understand the electronic can see that the full use of the transformer's two positive and negative half-weeks, no capacitance may also play the function of pulse charging, is said to have the effect of preventing polarization. Resistance is 6 kohm, light-emitting diode can be bright, indicating peak current in the 260~300ma, the effective value of about 180, this and I calculated the capacity of the charge in 120 there is a certain error, but also not the day difference, after all, charging current can not be completely converted to electrical energy. This circuit, I think although simple, but the classic, design the circuit of the person, must be a master. Not that he can only design such a simple circuit, but the market forces him to do so, and can push out such things, have to let people admire, estimated that the circuit also has 20 years of history.

From http://www.dzkf.cn/html/dianziDIY/2007/0615/2242.html