Hello soundmotor, well you have built a Cmoy amp so you are loyal to them.
That's cool. What turns me off is the need for dual supplies.
I have used the LM386 amps. They are tough, reliable, easy to buy.
They do not require dual power supplies. They are made for battery operation, and low current drain.
From the data sheet:
General Description
The LM386 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200.
The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent power drain is only 24 milliwatts when operating from a 6 volt supply, making the LM386 ideal for battery operation.
Features
Battery operation
Minimum external parts
Wide supply voltage range: 4V-12V or 5V-18V
Low quiescent current drain: 4mA
Voltage gains from 20 to 200
Ground referenced input
Self-centering output quiescent voltage
Low distortion: 0.2% (AV = 20, VS = 6V, RL = 8Ohm, PO = 125mW, f = 1kHz)
Available in 8 pin MSOP package
Applications
AM-FM radio amplifiers
Portable tape player amplifiers
Intercoms
TV sound systems
Line drivers
Ultrasonic drivers
Small servo drivers
Power converters
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RonRyan85, I don't understand why you think you need a 5 watt amp to transfer from tape to mp3? Why not go from line out on the tape player to line in on the soundcard?
One watt (RMS) is already way too much power for a single headphone amp.
0.089 watt to 0.238 watt is what most headphones are capable of. After that they are overloaded.
http://www.rane.com/pdf/note100.pdf