The circuit is based on the TL072 Op Amp and its output is powered by the bc338 and bc328 transistors. A simple and low cost circuit supply voltage +- 15 volts symmetrical. Each channel of the headphone amplifier uses an op amp that drives a complementary pair of transistors located in the overall negative feedback loop.
CD/DVD player output, tuner etc. There’s nothing to stop you from using this project as a general purpose headphone amplifier, as long as it’s powered by “line level” signals like
RIAA Preamplifier Performance
Output level: 90mΩ (max) into 8W headphone
Frequency response: 0.5dB down at 30Hz and 20kHz
Input sensitivity: 0.83V RMS for full power
Signal-to-noise ratio: -95dB unweighted (20kHz 20Hz) regarding 500mV input signal
Separation Between Channels: 50dB from 20Hz to 10kHz
Source: http://www.siliconchip.com.au/cms/A_30588/article.html
Headphone Amplifier schematic PCB files alternative link
Automatic 12V 24V Solar Panel Charger Circuit
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Solar Panel Charger 12V 24V