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30th November 2009, 10:42 PM
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#1 |
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diyAudio Member
Join Date: Mar 2009
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impedance bridging problems
I built three "net" class a amps to drive headphones from line level sources. All were disappointing. I realised that common emitter input was always going to give problems in impedance bridging.
Heres my solution, emitter follower input. I chose a high current capable device to drive the second stage. The amp sounds good to my old ears on all line level sources to my Grado's. I don't have much test equipment, so i wondered if the 2n3055 collector load together with the emitter resistor was introducing an element of voltage gain (2?) what do you guys think? 
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24th December 2009, 01:02 AM
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#2 |
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diyAudio Member
Join Date: Mar 2009
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Of course there can't be any voltage gain from an emitter follower. Still it works nicely.
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