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Classab amp

prydin·classab-amp-mosfet·kicad/classab-amp.kicad_pcb

Classab amp PCB layout, top view — open source board by prydin

About the Classab amp PCB

Classab amp is an open source PCB design by prydin, published on GitHub. It is a 2-layer board measuring 84.5 × 82.6 mm, with 63 components from 36 distinct parts.

By type, the board carries 24 resistors, 13 transistors, 11 capacitors, 9 diodes and 5 connectors.

It belongs with the audio designs in this gallery.

From the project

MOSFET-based 50W Class AB amplifier

The amplifier has been tested with rail voltages ranging from +-24V to +-37V with good results. Obviously, higher output power requires more voltage. The recommended supply voltage range is +-24V to +-40V.

In my build, I'm using a 2x25V toroidial transformer. Where I live, this ended up giving me 2x39V rectified voltage, which is a bit overkill for 50W, but some extra headroom is never a bad thing.

Classab amp, from the project README
From the project README

Classab amp bill of materials (BOM)

63 components, 36 distinct parts.

QtyPartRefs
5
2N5551
Q1, Q2, Q11, Q12, Q15
3
2N5401
Q3, Q4, Q16
1
BD140
Q6
2
BD139
Q7, Q8
1
IRFP240
Q9
1
IRFP9240
Q10
1
SPEAKER
J1
3
~
J2, J4, J5
1
INPUT
J3
1
300
RV1
3
1N4148
D1, D4, D5
2
1N5919
D6, D11
4
1N4004
D7, D8, D9, D10
1
4.7u
C1
2
100p
C2, C5
3
100n
C3, C15, C16
1
220u
C4
1
10u
C6
1
10n
C7
2
4700u
C13, C14
Show 16 more
QtyPartRefs
1
150
R1
1
22k
R2
3
470
R3, R4, R5
1
4.7k
R6
2
1k
R7, R19
2
330
R8, R18
1
22k
R9
3
100
R10, R14, R22
1
4.7k
R11
1
330
R12
1
10k
R13
1
220
R15
2
0.33
R16, R17
1
10
R20
1
10
R21
2
100
R23, R24

Classab amp design files

The KiCad project lives in the prydin/classab-amp-mosfet repository on GitHub; these links point at the commit this page was built from.

Classab amp: common questions

How big is the Classab amp PCB?

The Classab amp measures 84.5 × 82.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Classab amp?

63 components, from 36 distinct parts. The full bill of materials is listed on this page.

Where can I download the Classab amp design files?

From the prydin/classab-amp-mosfet repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Classab amp design in my own project?

The repository has no license, so all rights stay with prydin. Use it as a reference, and ask the author before reusing the design.

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