This headphone amplifier from AW Products is based on the highly acclaimed RA-1 Headphone Amplifier circuit, it is small and light weight and utilizes two 9V batteries. Please refer to the information below:PRODUCT DETAILS:
OP AMP IC : JRC4556
RESISTOR : DALE CLOSE TOLERANCE
CAPACITOR : WIMA AUDIO GRADE
WORKING VOLTAGE : 18V (9V X 2 PCS INCLUDED)
BATTERY WORK LIFE : AROUND 20 HOURS (DEPENDS ON DIFFERENT HEADPHONE OUTPUT CONDITION)
SNR : 110DB
THD : 0.005%
CASE MATERIAL : ALUMINUM
PRODUCT SIZE : 100 X 70 X 25MM
WEIGHT : 160g (NOT INCLUDING BATTERIES)
BEST USED TO DRIVE HEADPHONES WITH IMPEDANCE RANGE : 16 ohm TO 120 ohmYOU CAN CHANGE DIFFERENT OP AMP IC TO TAILOR THE SOUND QUALITY. BELOW ARE OP AMP ICs MODELS THAT CAN BE USED:
1) NE5532
2) OPA2134PA
3) OPA2227PA
4) OPA2111KP
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