Solar Calculator Disassembly

dcexpert

Solar Calculator Disassembly [Copy link]

 

 

I bought four card-type solar calculators on Taobao for 10 yuan, but one of them didn’t work, so I took it apart and shared it with you.

front

Reverse

dcexpert

The calculator is a card-shaped one, which is attached to the bottom board with adhesive tape and can be easily removed with a utility knife. After disassembling it, you can see that the calculator consists of several parts such as the motherboard, LCD, and solar cell, which is very simple.

Front of motherboard

qwqwqw2088

Just a binding chip

Solar cell power supply

eric_wang

I've disassembled several remote controls that weren't working properly these days.

Because it has not been used for several months and the air is humid in the south in summer, some buttons on the remote control need to be pressed hard to work properly; the battery is also rusted and swollen.

After taking it apart it was similar to this calculator. I used an eraser to rub the contacts on the PCB, cleaned the battery compartment and put it back and everything returned to normal.

I have a question, why can’t the remote control be made into light-powered? Is the cost too high?

If the remote control does not need to change the battery, there is no need to worry about the battery being damaged and corroding the remote control.

chineseboyzxy

The lights in the room are off, it’s pitch black, how can you watch TV, change channels, or use the air conditioner...

一杯星巴克

This card-shaped design is pretty good.

dcexpert

eric_wang posted on 2021-1-20 09:44 I have disassembled several remote controls that are not working well these days. Due to the fact that they have not been used for several months and the humid air in the south in summer, some buttons on the remote control need to be pressed hard...

The transmission power of the remote control is relatively large, and the solar power supply is not enough.

dcexpert

A cup of Starbucks published on 2021-1-20 11:20 This card-shaped design is still good.

Nice design, but poor workmanship.

eric_wang

dcexpert posted on 2021-1-20 13:40 The remote control has a relatively large transmission power, and the solar power supply is not enough.

I see

damiaa

Calculators and remote controls are high-volume and universal products that are very cost-conscious. The chips are all bonded, the LCDs have no legs, and the PCBs are still single-panel. It's worth every penny to think of cheap.

90houyidai

What is this solar cell called? Can I buy it on Taobao? What is the voltage and current?

I read some information that the current is very small, so does the chip being bonded not need a processor? Is the current enough?

dcexpert

90houyidai posted on 2021-1-20 15:50 What is this solar cell called? Can I get it on Taobao? What is the specific voltage and current? I read some information that the current is very small, so...

The amorphous silicon used in the calculator has better weak light characteristics. Generally, a single one is 0.5V, and the maximum current is only a few mA, so multiple ones need to be connected in series. Usually, 4 are connected in series on the calculator.

dcexpert

90houyidai posted on 2021-1-20 15:50 What is this solar cell called? Can I get it on Taobao? What is the specific voltage and current? I read some information that the current is very small, so...

90houyidai

dcexpert published on 2021-1-20 17:19

If the electronic watch uses this, does it not need to be charged?

dcexpert

90houyidai posted on 2021-1-21 10:49 If the electronic watch uses this, does it not need to be charged?

Casio's Eco-Drive watches are like this, I have one that I have been using for more than ten years.

90houyidai

dcexpert posted on 2021-1-21 13:36 This is what Casio's Eco-Drive watch is like. I have one that I have been using for more than ten years.

How does the MCU manage to work with such a low-power battery?

dcexpert

90houyidai posted on 2021-1-25 11:01 How does the MCU manage to work with such a low-power battery?

There is a dedicated low-power MCU

90houyidai

dcexpert posted on 2021-1-25 11:51 There are special low-power MCUs

Does it mean the kind of bonding that is done with cow dung? What is the general R&D and production process for this kind of bonding?

yhg48888

curious