You are All power supply categories.
All electronic devices require power. We have a lot of power supply circuits for you to choose suitably. Also, the battery is one of the important sources. It needs a power supply, too. To charge them work well. And, We love renewable energy, clean, and long with solar.
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What is more? See below the lists.
See 5V 3A power supply circuit using LM323K or LM350 or 7805 by helping of the power transistor. For digital load, microcontroller, even raspberry-pi.
Learn types of rectifier circuit using op-amp. A diodes cannot rectifier ACV lower mV. But 741 rectifiers can help it, in filters, signal measurements, etc.
This is 5v 12v dual power supply circuit using 2N3055 and Zener diode for 12V then to LM309 or IC-7805 dc regulator IC for 5V output which easy circuit [...]
Your amplifier may sound better than before. Just change the appropriate power supply circuit. Multiple levels of output voltage. For example 15V Dual regulator for pre amplifier. And 38V Dual for main amplifier etc.
Let's learn about the transistor series voltage regulator with short circuit and overload protection. And how it reduces ripple.