Part Number : YX801
Function : Solar LED drive
Package : TO-94 4Pin Type
Description
YX801 : The two 1.25V charge current or one Lights in a stable manner LED in the pond. Light of the sun Saw And to charge the rechargeable battery and a battery hit the error, The point the LED in the charging battery is charged to at night Light, automatic switching.
Circuit
Pin 1 attached to the solar panel +ve
Pin 2 attached to the solar panel -ve
Pin 3 attached to battery -ve and one leg of the LED
Pin 4 attahed to battery +ve via the other leg of the LED and a resistor.
Reference Site
1. http://forums.parallax.com/discussion/132034/yx801-ic-what-does-it-do
2. http://www.datasheetcafe.com/yx8018-datasheet-pdf/
YX801 datasheet refer to YX8018 datasheet