50W Class A Hi-Fi Amplifier

207

02:21:15

This one turned out to be pretty good. Some of the specs are :
- Output power - 46W/4ohm
- Drawn Power - 217W
-Efficiency - 21% can be brought higher at expense of quality. 
- Ripple rejection - 41dB
- Frequency response - quite broad at 8Hz-200Khz (-3dB) 
- THD+N - <0.025%@1Khz/55W

published 11 years ago

hurz

11 years ago

Whats the job of the PNP connected to the LED? I think its not needed, except you would like to demonstarte something like temperatur compensation? LEDs do have PTC and your upper current source does have NTC - so is it suppose to compensate somehow? I think the current source itself is perfect enough without the below LED, however it makes sense to move the LED as reference to the current source directly and do a termal coupling with both BJTs. Keep it up!

thebugger

11 years ago

The distortion seems to be higher without the LED and the transistor. It sort of acts like an emitter degeneration resistor (with a value of ~330ohm) but more pefect than a normal resistor. Plus it provides some stability rather than having the transistor directly grounded.

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