This 100W Audio Amplifier design uses two V-MOSFET transistor technology as the output stage, delivering 100W in output, with a 4 Ω load. It is important that the transistor of the output stage, kept cool by adding a heatsink or fan for example.
For this haigh power fet amplifier, use two symmetrical power supply.
V max: balanced + / – 65V DC
V max: balanced + / – 60V DC
I max: 6A + / – 65V
I max: 5A + / – 60V
100W Audio Amplifier based F.E.T Parts list :
| R1 27 kΩ | C1 1 uF 63V | D1 1N759A 0.5W 12V zener |
| R2 4.7 kΩ | C2 1nF 100V | D2 1N4738AT 8.2V 1W zener |
| R3 5.6 kΩ | C3 100 uF 16V | D3 1N4738AT 8.2V 1W zener |
| R4 5.6 kΩ | C4 100 nF 100V | D4 1N4738AT 8.2V 1W zener |
| R5 47 k | 22 uF 16V C5 | D5 1N4738AT 8.2V 1W zener |
| R6 1 k | 4.7 pF ceramic C6 | Q1 BC547 |
| R7 22 kΩ |
22 uF 16V C7
|
Q2 BC547 |
| R8 12 Ω | 47 uF 16V C8 | Q3 2N5460 |
| R9 1 M | C9 100V 1nF | Q4 MPSA93 |
| R10 22 kΩ | C10 100 uF 100V | Q5 MPSA93 |
| R11 4.7 kΩ | C11 100 uF 100V | Q6 BC182 |
| R12 33 Ω | C12 100 nF 250V | Q7 MPSA43 |
| R13 82 Ω | C13 150 nF 100V | Q8 BC182 |
| R14 33Ω | C14 100 nF 250V | Q9 BC212 |
| R15 2.7 kΩ | C15 100 uF 35V | Q10 MPSA43 |
| R16 270 Ω | Q11 BC182 | |
| R17 680 Ω | Q12 2SK134 or 2SK135 | |
| R18 33 kΩ | L1 20 turns 0.6mm on R25 | Q13 2SJ49 or 2SJ50 |
| R19 680 Ω | ||
| R20 82 Ω | ||
| R21 22 kΩ | ||
| 0.33 Ω 5W R22 | ||
| 0.33 Ω 5W R23 | ||
| R24 8.2 kΩ | ||
| R25 10 Ω 1W | ||
| 470 Ω potentiometer TR1 | ||
| 4.7 kΩ potentiometer TR2 |
