Hi all. I’ve moved this post to the DIY section of the forum. My apologies for the previous mistake. I’m going to build an AMB M3 Headphone amplifier, which probably will serve also as preamplifier section for a LM3886-based loudspeaker amp. I’m currently using another headphone amp with a...

Hi all I’m interested in the Meier passive crossfeed circuit. I’ve made the Linkwitz crossfeed but I’m not using it because it dulls too much the sound and reduces the available volume a lot, although I like the way it places the soundstage “farther” from my face. I have read that the Meier...

Hi I have a doubt about the virtues of the "balanced" connection for headphones (separate ground for each channel and not the usual tip-ring-sleeve jack). If the amplifier is only "semi-dual mono", with the power tranformer shared between both channels (all the rest is dual: there are two...

Hi I’ve searched this forum regarding BJT hFE matching and I’m a little confused. There are head-fiers that favour Vbe measurement (which I don’t know how to make) over simple hFE testing. Others say the hFE exact value is less important than the relative values between pnp, npn and npn-pnp...