CMoy is very simple portable headphone amplifier. The amplifier was originally posted by Chu Moy on headwize.com. The best source of information about this amplifier is article How to Build the CMoy Pocket Amplifier. If you use Google, you will find many pages and pictures about CMoy. Few months ago I decided built this amplifier also. In my post you can find my experience with creating this simple but very good amplifier.
First of all I prepared the schematic. It is standard CMoy schematic, non-inverting amplifier with gain 11. The power supply is making virtual ground (half of supply voltage). My power supply unit has two possibility. Firts possibility is use passive voltage divider, consist of two resistors R1a and R1b. In this case it is necessary use also two electrolytic capacitors C1a and C1b. The second possibility is used active divider TLE2426 from TI. In this case it is necessary connect only one capacitor between Vcc+ and Vcc-.
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