This headphone amplifier circuit is different to conventional modern construction techniques in that it is air Wired,P2P (peer to peer) or free form wiring just like in the good old Valve days before the intervention of PCB's and the transistor.
Rather than a traditional enclosure, the hole circuit is encapsulated in polyester resin to enhance the internals.
If your reading this and thinking why do you need an amplifier for headphones then click here
Although allot of cMoy headphone amplifiers are designed to be portable this one is designed for the desktop although a battery pack could be made also.
This is a pretty long instructable so "make a brew" as we say in Yorkshire and get comfy .
On the upside there is plenty of pictures :)
Step 1: The Schematic
The component list is as follows
Power supply section
1x DC Power Jack
1x 5mm LED
R1LED : 1x 1k to 10k 0.6 watt metal film resistor (For the Power LED, Anywhere from 1k to 10k will be good it all depends on the input voltage and how bright you like your LED.)
CP1/2 : 2x 470uf 35 or 50v Power Capacitors
RP1/2 : 2x 4.7k 0.6 watt metal film resistors (For the power supply Voltage divider)
IC1 : 1x OPA2107 Dual Operational Amplifier
C1L/R : 2x Wima MKS 0.68uf 63v Capacitors (for the audio signal input)
C2/3 : 2x 0.1uf Polyester Box capacitors (To stabilise the OP-AMP)
R1LED : 1x 1k 0.6 watt metal film resistor (1/2 Watt)
R2L/R : 2x 100k 0.6 watt metal film resistors (1/2 Watt)
R3L/R : 2x 1k 0.6 watt metal film resistors (1/2 Watt)
R4L/R : 2x 10k 0.6 watt metal film resistors (1/2 Watt)
R5L/R : JUMPERED (optional,)
2x 3.5mm Stereo Jack Sockets
Downloads: EaglePCB .SCH Schematic and PDF below