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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

impedance bridging problems
impedance bridging problems
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Old 30th November 2009, 10:42 PM   #1
hotironsmoke is offline hotironsmoke  United Kingdom
diyAudio Member
Join Date: Mar 2009
Wink 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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Old 24th December 2009, 01:02 AM   #2
hotironsmoke is offline hotironsmoke  United Kingdom
diyAudio Member
Join Date: Mar 2009
Of course there can't be any voltage gain from an emitter follower. Still it works nicely.
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