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.
We often use a Zener diode in a lot of the electronic circuits. For instance, power supplies, voltage detectors, etc. It is so helpful device in electronics. But…Do you understand good enough? Today we will learn Zener diode principle working and example applications usage.
For control the voltage battery is steady, output is fixed to 8V, low ripple voltage about 1 mV at input voltage changing between 10V to 30V
This is four circuits of LED voltage indicator are simple and easy to builds for check voltage battery and others, use as zener,transistor,LM339 and more