Kiddle CO Alarm Disassembly

My CO Alarm expired recently so I decided to disassemble it and see what components I could get.

The model number of the CO Alarm is KN-COPP-3-RC, made in August 2013.

The back cover can be removed simply by removing the screw in the center. I also removed the battery connector and the AC adapter from the PCB.

The AC adapter is simply a transformer with 120V AC 3.8W input and 9V AC 250mA output. Not a very powerful transformer but should be enough for most electronic projects.

Here’s the PCB. The big metal part at the bottom left is the CO sensor, and the big black round part at the bottom right is the piezo buzzer. There are also two push buttons and one 25V 330μF capacitor that can be easily removed.

The chip with a sticker at the center is PIC16F883, a 28pin 8-bit microcontroller with 4K program memory, 256 bytes SRAM, and 256 bytes EEPROM. I should be able to use it in other projects if I have the right tools to remove it.

The piezo buzzer is EFM-290ED. This is a very loud piezo alarm but requires an external oscillator to work.