Hello, today I will show you how to make a DC power supply for your amplifier project. An audio amplifier normally needs DC power supply to feed it so you need to know how to make it if you want to make a good amplifier.
Now, let's start.
(√ amplifier output/speaker resistance) X 1.4142 for class ab amplifier.
However, I use class T amplifier that has over 80 % efficiency so I think this formula is ok.
(√ amplifier output/speaker resistance) X 1.2 is enough
(√ 15 / 4) X 1.2 = 2.32 Ampere x 2 (two channel) = 4.64 A
That's why I use 5 A transformer for TA 2024 amp board.
The best transformer's output current is infinity but you can not find it in real life.
4. Connect AC output to a bridge diode rectifier.
I use bridge rectifier IC because it is easy to solder, I can solder the IC directly without a PCB.
5. Connect DC smoothing capacitor.
C = I/ (2 X f) x Vpp
C = capacitor value in Farad unit
1 Farad = 1,000,000 microfarad (uF)
I = a load current in Ampere unit
1 Ampere = 1000 mAh
F = AC line frequency in Hz unit
Vpp is the ripple voltage your circuit can withstand and work without any problem, the lower the ripple voltage the cleaner DC output, but you need bigger capacitor too.
Now, it is a test time.