耳机放大器电路 (Headphone Amplifier)
耳机放大器电路 (headphone amplifier)
amplifier parts:
p1_____________22k log.potentiometer (dual-gang for stereo)
r1____________560r 1/4w resistor
r2,r3__________10k 1/4w resistors
r4_____________12k 1/4w resistor
r5,r6___________2r2 1/4w resistor
r7_____________22r 1/2w resistor
c1______________1΅f 63v polyester capacitor
c2,c3,c4______100΅f 25v electrolytic capacitors
c5_____________22pf 63v polystyrene or ceramic capacitor
c6_____________22΅f 25v electrolytic capacitor
ic1___________lm833 or ne5532 low noise dual op-amp
q1,q3_________bc337 45v 800ma npn transistors
q2,q4_________bc327 45v 800ma pnp transistors
j1______________rca audio input socket
power supply parts:
r7______________2k2 1/4w resistor
c7,c8________2200΅f 25v electrolytic capacitors
d1____________100v 1a diode bridge
d2____________5mm. or 3mm. red led
ic2___________7815 15v 1a positive voltage regulator ic
ic3___________7915 15v 1a negative voltage regulator ic
t1____________220v primary, 15 + 15v secondary 5va mains transformer
pl1___________male mains plug
sw1___________spst mains switch
notes:
can be directly connected to cd players, tuners and tape recorders.
tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 2000 ohms.
can drive old 8 ohms impedance headphones, but these obsolete devices are not recommended.
schematic shows left channel and power supply.
numbers in parentheses show ic1 right channel pin connections.
a correct grounding is very important to eliminate hum and ground loops. connect in the same point the ground sides of j1, p1, c2, c3 & c4. then connect separately the input and output grounds at the power supply ground.
technical data:
output voltage: well above 5v rms on all loads
sensitivity: 250mv input for 5v rms output
frequency response: flat from 30hz to 20khz
total harmonic distortion @ 1khz & 10khz: below 0.005% on 32 ohms load and up to 4v rms output (typical 0.003%)
total harmonic distortion @ 1khz & 10khz: below 0.005% on 100 to 2000 ohms load and up to 5v rms output (typical 0.003%)
unconditionally stable on capacitive loads
欧盟将统一使用Type-C充电接口 iPhone15将被强制使用USB-C
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amplifier parts:
p1_____________22k log.potentiometer (dual-gang for stereo)
r1____________560r 1/4w resistor
r2,r3__________10k 1/4w resistors
r4_____________12k 1/4w resistor
r5,r6___________2r2 1/4w resistor
r7_____________22r 1/2w resistor
c1______________1΅f 63v polyester capacitor
c2,c3,c4______100΅f 25v electrolytic capacitors
c5_____________22pf 63v polystyrene or ceramic capacitor
c6_____________22΅f 25v electrolytic capacitor
ic1___________lm833 or ne5532 low noise dual op-amp
q1,q3_________bc337 45v 800ma npn transistors
q2,q4_________bc327 45v 800ma pnp transistors
j1______________rca audio input socket
power supply parts:
r7______________2k2 1/4w resistor
c7,c8________2200΅f 25v electrolytic capacitors
d1____________100v 1a diode bridge
d2____________5mm. or 3mm. red led
ic2___________7815 15v 1a positive voltage regulator ic
ic3___________7915 15v 1a negative voltage regulator ic
t1____________220v primary, 15 + 15v secondary 5va mains transformer
pl1___________male mains plug
sw1___________spst mains switch
notes:
can be directly connected to cd players, tuners and tape recorders.
tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 2000 ohms.
can drive old 8 ohms impedance headphones, but these obsolete devices are not recommended.
schematic shows left channel and power supply.
numbers in parentheses show ic1 right channel pin connections.
a correct grounding is very important to eliminate hum and ground loops. connect in the same point the ground sides of j1, p1, c2, c3 & c4. then connect separately the input and output grounds at the power supply ground.
technical data:
output voltage: well above 5v rms on all loads
sensitivity: 250mv input for 5v rms output
frequency response: flat from 30hz to 20khz
total harmonic distortion @ 1khz & 10khz: below 0.005% on 32 ohms load and up to 4v rms output (typical 0.003%)
total harmonic distortion @ 1khz & 10khz: below 0.005% on 100 to 2000 ohms load and up to 5v rms output (typical 0.003%)
unconditionally stable on capacitive loads
欧盟将统一使用Type-C充电接口 iPhone15将被强制使用USB-C
压敏电阻器基础知识（原理图符号_作用_型号及参数_选型技巧）
如何降低智能家居中的蓝牙延迟
混动专用变速器电机输入轴断裂问题研究探讨
京东方发布新一代人工智能开放平台
耳机放大器电路 (Headphone Amplifier)
基于特征谱带的高光谱遥感矿物谱系识别
Spansion与中芯国际扩展65纳米产能并制造45纳米闪存记忆体
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直线马达立体式车库在攀枝花亮相
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