All Electronics Hobby Projects. You can build quickly them when have free times. Most cheap and easy to find parts.
The 0-50v 2a power supply Circuit by IC LM723 + Transistor 2N3055 & BD140 & A671,can control current by VR-5K, LED5 for display OVERLOAD,use transformer 3A, [...]
This is 12V 10A power supply circuit can use it instead of normal 12V car battery. But save and easy to use when you are in your house.
Simple MOSFET Amplifier Circuit easy make!
Good transistor audio amplifier circuit, at 40 watts OCL RMS using 2N3055+MJ2955 is easy to build,and very inexpensive. To use Power Supply +35V -35V 2A.