The submit reveals an efficient fish aquarium light optimizer circuit which automatically manages the illumination of a group of properly chosen LEDs with regards to the differing daylight and after darkness sets in.
As demonstrated in the diagram the offered automatic fish aquarium light optimizer circuit comprises of only a few transistors as the active parts, whereby the NPN device is set up as a standard collector while the other PNP as an inverter.
Throughout day time the solar panel generates the stipulated amount of light transformation offering the popular collector phase with the needed amount of voltage. The NPN transistor base is limited with a maximum of 12 V with the help of the linked zener which will makes sure that the potential across the linked red, blue, green, white LEDs by no means surpasses this value no matter the solar panel peak voltage ranges.
In the course of dusk when the solar panel light starts worsening, the LEDs as well go through a consequently reducing voltage problems simulating a equally dimming impact in their illumination stages, in accordance with the sunlight....until it's nearly dark when these LEDs entirely shut off.
At the same time, provided that the solar panel voltage sustains an optimal voltage the PNP is compelled to stay shut off, nevertheless as the sun commences to set, the potential at the base of the PNP device starts dropping just as soon as it drops below the 9 V mark, guides the linked blue LEDs to enhance gradually until these turn out to be completely lighted after dusk.
The procedure becomes reversed at daybreak, along with the cycle maintains repeating simulating a day/night cycle light consequence inside the fish aquarium
The 9 V at the emitter of the PNP might be resulting from any common 9 V AC/DC adapter or simply from a cell phone charger unit.