Headphone amplifier used 2N3904/2N3906.(Power supply is 12V AC-DC adapter.)

I designed a headphone amplifier.
A transistor uses only 2N3904 and 2N3906.

Schematic
(240p -> 220p)

Simulation result:

Evaluation circuit.

Frequency response.

Total Harmonic Distortion.

Total Harmonic Distortion is 0.000144%(at 1.0Vpp output).

Parts layout.
(2016/01/25 Update.)

At your own risk!
Good luck!

ポチっと押していただくと、僕のランキングが上がって創作意欲が湧いてくるんです(笑)
ご協力をお願いします m(_ _)m
☆にほんブログ村 電子工作
☆にほんブログ村 オーディオ

I made a headphone amplifier.

I build a headphone amplifier using 2N3904/2N3906, BC337/BC327.

The circuit diagram of headphone amplifier.

Select the same hFE transistors for the first stage and current mirror.

Parts list(Stereo)		Qty	Notes
2N3904	NPN transistor	x8	or BC547
2N3906	PNP transistor	x2	or BC557
BC337	NPN transistor	x2
BC327	PNP transistor	x2
1N4148	Diode	x4
1S3	SBD	x2
47p	Film capacitor	x2	WIMA FKP2
0.047u	Film capacitor	x2
2.2u	Film capacitor	x4	Panasonic ECQV
0.27u	Film capacitor	x4	0.1u - 0.27u
10u	Tantalum capacitor	x2	3.3u - 10u
LED	Red LED	x2
10 ohm	Metal film resistors	x10
510 ohm	Metal film resistors	x6
1.6k	Metal film resistors	x2
4.7k	Metal film resistors	x2
12k	Metal film resistors	x2
36k	Metal film resistors	x4
100 ohm	Trimm resistor	x2	B Curve
10k	VR	x1	A Curve

The power supply.

Parts layout.

Red Line is jamper.

Purple Line is wire(AWG22).

Very clear and dynamic sound!

At your own risk! Good luck!