18W音频放大器电路
18w音频放大器电路
amplifier parts:
p1 = 22k log.potentiometer (dual-gang for stereo)
r1 = 1k 1/4w resistor
r2 = 4k7 1/4w resistor
r3 = 100r 1/4w resistor
r4 = 4k7 1/4w resistor
r5 = 82k 1/4w resistor
r6 = 10r 1/2w resistor
r7 = r22 4w resistor (wirewound)
r8 = 1k 1/2w trimmer cermet (optional)
c1 = 470nf 63v polyester capacitor
c2,c5 = 100΅f 3v tantalum bead capacitors
c3,c4 = 470΅f 25v electrolytic capacitors
c6 = 100nf 63v polyester capacitor
d1 = 1n4148 75v 150ma diode
ic1 = tle2141c low noise,high voltage,high slew-rate op-amp
q1 = bc182 50v 100ma npn transistor
q2 = bc212 50v 100ma pnp transistor
q3 = tip42a 60v 6a pnp transistor
q4 = tip41a 60v 6a npn transistor
j1 rca audio input socket
power supply parts:
r9 = 2k2 1/4w resistor
c7,c8 = 4700΅f 25v electrolytic capacitors
d2 100v 4a diode bridge
d3 5mm. red led
t1 220v primary, 15 + 15v secondary 50va mains transformer
pl1 male mains plug
sw1 spst mains switch
notes:
can be directly connected to cd players, tuners and tape recorders.
don't exceed 23 + 23v supply.
q3 and q4 must be mounted on heatsink.
d1 must be in thermal contact with q1.
quiescent current (best measured with an avo-meter in series with q3 emitter) is not critical.
adjust r3 to read a current between 20 to 30 ma with no input signal.
to facilitate current setting add r8 (optional).
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. connect c6 at the output ground.
then connect separately the input and output grounds at the power supply ground.
technical data:
output power: 18 watt rms @ 8 ohm (1khz sinewave)
sensitivity: 150mv input for 18w output
frequency response: 30hz to 20khz -1db
total harmonic distortion @ 1khz: 0.1w 0.02% 1w 0.01% 5w 0.01% 10w 0.03%
total harmonic distortion @10khz: 0.1w 0.04% 1w 0.05% 5w 0.06% 10w 0.15%
unconditionally stable on capacitive loads
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amplifier parts:
p1 = 22k log.potentiometer (dual-gang for stereo)
r1 = 1k 1/4w resistor
r2 = 4k7 1/4w resistor
r3 = 100r 1/4w resistor
r4 = 4k7 1/4w resistor
r5 = 82k 1/4w resistor
r6 = 10r 1/2w resistor
r7 = r22 4w resistor (wirewound)
r8 = 1k 1/2w trimmer cermet (optional)
c1 = 470nf 63v polyester capacitor
c2,c5 = 100΅f 3v tantalum bead capacitors
c3,c4 = 470΅f 25v electrolytic capacitors
c6 = 100nf 63v polyester capacitor
d1 = 1n4148 75v 150ma diode
ic1 = tle2141c low noise,high voltage,high slew-rate op-amp
q1 = bc182 50v 100ma npn transistor
q2 = bc212 50v 100ma pnp transistor
q3 = tip42a 60v 6a pnp transistor
q4 = tip41a 60v 6a npn transistor
j1 rca audio input socket
power supply parts:
r9 = 2k2 1/4w resistor
c7,c8 = 4700΅f 25v electrolytic capacitors
d2 100v 4a diode bridge
d3 5mm. red led
t1 220v primary, 15 + 15v secondary 50va mains transformer
pl1 male mains plug
sw1 spst mains switch
notes:
can be directly connected to cd players, tuners and tape recorders.
don't exceed 23 + 23v supply.
q3 and q4 must be mounted on heatsink.
d1 must be in thermal contact with q1.
quiescent current (best measured with an avo-meter in series with q3 emitter) is not critical.
adjust r3 to read a current between 20 to 30 ma with no input signal.
to facilitate current setting add r8 (optional).
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. connect c6 at the output ground.
then connect separately the input and output grounds at the power supply ground.
technical data:
output power: 18 watt rms @ 8 ohm (1khz sinewave)
sensitivity: 150mv input for 18w output
frequency response: 30hz to 20khz -1db
total harmonic distortion @ 1khz: 0.1w 0.02% 1w 0.01% 5w 0.01% 10w 0.03%
total harmonic distortion @10khz: 0.1w 0.04% 1w 0.05% 5w 0.06% 10w 0.15%
unconditionally stable on capacitive loads
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中国高海拔地区提高配网供电半径关键技术研究取得新突破
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利用LTC2380-24将分布式读取与链式模式相结合
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