RudeWolf

I almost started that one as well. It would be nice to have the PCB revised.

Okay, that was an exaggeration on my part. But dB/V (or dB/A for that matter) makes sense only if the load impedance is known. And in my opinion, the utility of dB/V falters if the load can force the amp to exceed the bounds of its current or power delivery. As in - cease being a perfect voltage source.

I know enough about conflicts between Middle Eastern nations (tribes, really) that my take on Israel v Palestine would at best be amusing if not completely clueless. It would be like Westerners discussing Russian-Ukraine relations.

dB/V and dB/mW are far from being the same spec. As in - they are the same spec only if the headphone has 1000 ohm load resistance. It's a simplification but generally sensitivity (dB/V) will tell you how much gain needs to be applied to get to a certain SPL. A high-sensitivity headphone requires very little action on the volume knob to go loud, however it says nothing about the power draw because load resistance is out of the equation. That's why you can sit comfortably at 10'o clock on the knob and cook your outputs due to crazy currents being drawn.

I'm doing a side gig reviewing headphones. Companies send me stuff and I give my opinion on things. I recently got a certain Moondrop Para planar which I thought sounded pretty okay. Then I saw the spec sheet and my hair stood up a bit- 101dB/V at 8 ohms. Or, when converted to actual efficiency figures... 80dB/mW. My question to the amp gurus here - will this load kill amps? It's a rare case of low efficiency combined with high sensitivity so people will be lulled into thinking that it's an easy load to drive. Like - hurr-durr, pot's only at 9'o clock and it's already hella loud! When in reality you're pushing serious mA and mW. And I'm not talking about proper beefy discrete output amps. Hard-to-drive cans these days are so rare that everyone's just getting by with opamp-buffer composites or just opamps. What say you? Will it KEAL?

Is Challenger the fragile masculinity car of the US? For us it's the bimmer.

Is this self-oscillation?

What did you load the Dynalo with? I find that 30/300 Ohm loads work nice and you need to come up with a voltage target that's relevant for headphones. P.S. Am I the only one who can't download these reports? My browser just loads for a little bit and then nothing, the download doesn't start.

Will the circuit PSRR be enough for SMPSU usage? I'm generally pretty chill about SMPSU's as they often eliminate any kind of hum. At the same time this is a very fast amp and I would like to avoid HF noise on the outputs or even self-oscillation.

Can't tell what people want. I didn't expect my CFA3 thread to blow up like that. As I said, I'm pretty pessimistic about DIY these days. Don't want to go all grumpy old guy that younglings can't be bothered to build stuff, so I'd actually "blame" there generally good selection of equipment that's available for buying these days. For the original th2 + thps combo this enclosure seems like the best option. 250x300mm inside space means that around 190mm of length is used for PCB's an the rest 110mm can be taken by connectors and the trafo. Of course, then there's the @JoaMat PCB which should fit on the 2U heatsink saving up even more space on the "floor" of the enclosure. If there's a matching board for the PSU (say, the thps) which would fit the other 2U heatsink, then something like this (or a longer enclosure) could be used, if SE is all one wants.

I'm NOT some folks! Stellar job, btw. My main beef with the OG board was that it's too narrow to fit in a dissipante case without some chunky brackets. I sold off my CFA3 because I never used BAL outputs, so I'm exploring ways of building something SE and smaller footprint wise.

They're small fry. They got fined and that's all. And maybe a serious talk.

Looks like we're in good company!

Saves the hassle of a post-war purge.

One of the better articles on what's happening in Russia. For me it was rather sobering. I hope Google translate does a passable job - https://faridaily-substack-com.translate.goog/p/--3c3?_x_tr_sl=ru&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp