Name	diyAB Amp, aka. The Honey Badger
Type	Solid state
Application	Driving loudspeakers
Class	A/B
Approx Cost	it depends
Designer	ostripper
Thread	main thread and build thread and discussion of diyAudio Store boards

The first Class AB power amplifier to be featured at the diyAudio Store. It has been designed from the ground up with the sonic character, power output and most of all the DIYer in mind. With a basic power output of 150W at 8 ohms, this power amp is sure to have a place in every builder’s projects list. Not to mention its flexibility and adaptability to work with most output devices available locally in wherever country you may be.

These part values are based on the build guide for version V2.0, the version V2.4 schematic, and a few small modifications as described in the comments.

Part	Value / Description	Comments
Transistors
Q1, Q2	SS9014
Q3, Q4, Q7, Q8	KSC1845
Q5, Q6, Q9	KSA992
Q10	MJE350
Q11, Q12, Q13	MJE340
Q14	MJE15032
Q15	MJE15033
Q16, Q17, Q18	MJL4281	Higher SOA than standard choice in build guide
Q19, Q20, Q21	MJL4302	Higher SOA than standard choice in build guide
Diodes
D1, D2	1N914
D3 (Cascode voltage reference)	1N4744A	Omit R18 and replace it with Zener diode (D3), use jumper “C-Z” (cascode / current mirror)
D4, D5, D8, D9	1N5408
D6	LED red 3mm
D7	LED blue 3mm
BAKER CLAMP “D-BC” DIODE	BAV21
Resistors
R1, R52	100 kΩ / 0.25 W
R2, R5, R22, R24	820 Ω / 0.25 W
R3, R6	22 kΩ / 0.25 W	22 kΩ for lower overall gain (more feedback): gain = 1+(R6/R5) = 27.8 *** measured (150 Hz sine): V-in = 0.342 VAC, V-out =9.1 VAC ==> gain = 9.1/0.342 = 26.6
R4	4.7 Ω / 0.25 W
R7	200 Ω multi turn trimmer
R8, R9, R15, R16, R26	100 Ω / 0.25 W
R10	22 Ω / 0.25 W
R11	10 kΩ / 0.25 W
R12	10 kΩ / 0.25 W
R13	15 kΩ / 0.25 W
R14, R28	2.2 kΩ / 0.25 W
R17	1 kΩ multi turn trimmer
R51	22 kΩ / 0.25 W
R19	68 kΩ / 0.25 W
R20, R21, R25	220 Ω / 0.25 W
R23	47 Ω / 0.25 W
R24	1.5 kΩ / 0.25 W
R26	10 Ω / 0.25 W
R27	51 Ω / 0.25 W	For approx. 10 mA current in “big” CCS
R29	680 Ω / 0.25 W
R30	500 Ω multi turn trimmer
R31	15 Ω / 0.25 W
R32, R33, R34, R35	22 Ω / 0.5 W
R53, R54	22 Ω / 0.5 W
R36	150 Ω / 1 W
R37, R38, R39, R40, R41, R42	2.2 Ω / 0.5 or 1 W
R43, R44, R45, R46, R47, R48	0.22 Ω / 3 or 5 W	KOA Speer seem to be the same thing as KIWAME
R49, R50	10 Ω / 3 W
Capacitors
C1	MKP, 4.7 µF / 35–50V	Audio input capacitor
C2	Silver Mica, 270pf / 50V - 100V
C3, C10, C12, C14, C16, C21	MKP, 100nf / 63V – 100V (C21: 250V)	C3: bypass for C4
C4	Non-Polar Electrolytic , 220uf / 50V – 100V	Feedback loop
C5	Electrolytic, 100 µF / 63V - 100V
C6	Film, 220nf / 35V - 50V
C7	Silver Mica, 100pf / 300V - 500V
C8	Silver Mica, 470pf / 300V - 500V
C9	Electrolytic, 22uf / 35V - 50V
C11, C15	Electrolytic, 220uf / 63V - 100V
C13, C17	Electrolytic, 470uf - 1000uf / 63V – 100V
C18, C19	Silver Mica, 47pf / 300V - 500V
C20	Film, 680nf - 2.2uf / 100V
LC Cap	Silver Mica, 5pf / 300V - 500V	Don't install the LC cap, the amp sounds better without it

The Honey Badger will work with rail voltages from +/-30VDC to +/-70VDC (see http://www.diyaudio.com/forums/solid-state/211905-diyab-amp-honey-badger-build-thread-102.html#post3873478). The build guide describes a linear power supply with +/-63VDC rails using a 800VA transformer with 45-0-45 VAC secondaries. Recommended capacitance is a total of 40'000 µf per rail.

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There are a number of options to consider when building the Honey Badger amp. First of all, read the build guide, which has a thorough description of most options.

This post also has some useful comments: http://www.diyaudio.com/forums/solid-state/211905-diyab-amp-honey-badger-build-thread-48.html#post3598622

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