This is First Variable DC Power Supply 1.2V to 30V 1A using LM317. using a few parts and build easy with PCB layout and can fine adjust voltage output.
When we build variable DC power supply,output 1A and adjust up to about 30V. Most use LM317, because high-efficiency, easy to apply and cheaper[...]
It can charge any size of the Gel cell batteries and extend the life of the Gel Cell battery. While the circuit is running, the LED indicates charging.
This is LM317 Low dropout regulator 5V 2A using TIP41, The voltage input is 5.1V DC is converted into 5V output,while maximum output current to 2A by TIP41 [...]