Nvarcher HDMI HIFI componentes discretos dual op amp EOPA para amplificador NE5532 OPA2604 TL072

Discrete op amp refers to a circuit board with operational amplifier capability assembled with discrete components. The disadvantage is also obvious, that is, it is large in size and difficult to produce on a large scale. Generally, it is made by audiophiles who have the pursuit of music.

This op amp is based on the HDAM circuit, which has been optimized. The HDAM circuit is a classic circuit of Marantz. Its sound has been tested by audiophiles for decades, and it is still alive today, which shows the excellent degree of this circuit.


Volume: width: 32MM, height 46MM, length 31MM.

Operating voltage: ±9V～±25V


This discrete op amp is a dual op amp, which can replace most of the dual op amps. NE5532, NEC4520, NEC4570, NJM2068D, NJM2114, NJM2214D, NJM4558, NJM4558D, NJM4560, NJM5532, NJM4558P, OP275, OPA2132, OPA2134, OPA2604, 027 TL0558D, TL RC4. When replacing, recognize the pin sequence, and insert it directly on the op amp seat. Note that this op amp has a lead wire as a ground wire, which can be connected to the nearest ground of the original circuit board.

元件	说明	编号	封装	替代	数量	单价
2SK170	N型场管	Q01, Q02, Q03, Q04, Q25, Q26, Q31, Q32	JFETM	2SK170	8	4
C3200		Q05, Q06, Q07, Q08, Q21, Q22, Q23, Q24, Q27, Q28, Q29, Q30	TO-92M	2SC2240	12	1
A1268		Q09, Q10, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18, Q19, Q20	TO-92M	2SA970	12	1
120Ω	金属膜电阻	R01, R02, R07, R08	0.25W	110Ω	4	0.15
10Ω	金属膜电阻	R03, R04, R09, R10	0.26W	12Ω	4	0.15
70Ω	金属膜电阻	R05, R06, R13, R14, R15, R16	0.27W	68Ω	6	0.15
178Ω	金属膜电阻	R11, R12, R19, R20	0.28W	180Ω	4	0.15
14KΩ	金属膜电阻	R17, R18, R27, R28, R29, R30, R31, R32, R33, R34	0.29W	15KΩ	10	0.15
10KΩ	金属膜电阻	R21, R22	0.30W	10KΩ	2	0.15
22Ω	金属膜电阻	R23, R24, R25, R26	0.31W	20Ω	4	0.15
2K2Ω	金属膜电阻	R35, R36	0.32W	2KΩ	2	0.15
2KΩ	金属膜电阻	VR1,VR2	精密可调电阻		2	2.8
PCB板					1	8
底板					1	15

The boards of the left and right channels are connected together and should be separated during production. As shown in the figure:

According to the schematic diagram, select the components used and start soldering. Because the pads are small and the component density is high, it is recommended to use a pointed soldering iron.

First solder the resistor, as shown in the picture: