DIY a $20 Dollars Hi-End Heaphone Amp

DIY Gwado RA1 Headphone Amplifier

Some people like you and me who can't afford to pay high price for this "state-of-the-art performance" Grado RA1 Headphone Amplifier, so what we can do is self DIY it, althought it might not be equal sound quality compare to the Grado RA1, but is up to you to tweaks it by changing the component like capacitor and resistor or even use a higher grade soldering lead, so at the end of the day, is still your own judging of the sound quality has gone worst or better then Grado RA1.

The DIY Instruction layout;

Gwado Ra1 Headphone Amplifier

Hopefully so far you can understand the layout as shown above, next we will need to purchase the part list.

Part list;

Resistor:
2 x 100K Ohm 1/2W $0.49 Parts Express Code: 002-100K
2 x 120k Ohms 1/2w $0.49 Parts Express Code: 002-120k
2 x 470k Ohms 1/2w $0.49 Parts Express Code: 002-470k
2 x 4.7k Ohms 1/2w $0.49 Parts Express Code: 002-4.7k

Capacitor:
2 x Dayton 4.7uF 250V Polypropylene Capacitor $2.79 EA- Parts Express Code: 027-422
2 x Dayton .10uF 250V Polypropylene Capacitor $0.67 EA- Parts Express Code: 027-400
2 x 330uF 35V Radial Electrolytic Capacitor $0.27 EA- Parts Express Code: 020-1164

IC:
1 x NJM 4556 $0.40 EA Mouser Part Number: 513-NJM#4556AL

Other Parts:
1 x 100k Dual Volume Pot
On/Off Switch
2 x 9Volt Battery Cell

Optional Upgrade of the PSU to a Virtual Ground with an TLE 2426 (3pin) IC

Optional Upgrade Parts
1 x TLE 2426 IC
1 x 220uf 25v Capacitors

Alright that's all, the rest shall leave it to you to complete it
Wish you all the best!

William Neo

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Amazon is selling Grado RA1@ $425USD.