6 weeks of work in total and the last embodiment of the phono and headphones schematic.
I use that black relay to link the input and output of the lh0002 buffers of the headphones amplifier when i'm using lighter (250 ohms ) headphones.
The distortions with the buffer working in the feedback loop aren't great .They are around -66db for h3 at 5khz(no even distortions...not that good) and -77db h2 at 1khz on 32 ohms, but with lm6172 with both outputs of a chip in parallel i can go safely with 32 ohms cans and extremely low distortions.
The buffers might be useless but LH0002 military version isn't exactly the bc337/327 buffer i used in simulations so i just hope that the reality will sound a bit better 🙂
The rest of those kits are just a high power voltage multiplier, +-20v and +-10.8v regulators, virtual ground generator, phono preamplifier, and split ac ground capacitor bank for the headphones outputs.Yes...i have two of them with two different capacitor banks.
The headphones amp offset might be a problem with the actual composition but that remains to be checked.The op-amps in the headph amp aren't placed in the photo as there is no clear choice for the final class AA amp.Probaly opa2132 and lm6172 will fit the bill.
The phono preamp is just aiwa c-22 on steroids.The schematic and asc file will be available soon.
I use that black relay to link the input and output of the lh0002 buffers of the headphones amplifier when i'm using lighter (250 ohms ) headphones.
The distortions with the buffer working in the feedback loop aren't great .They are around -66db for h3 at 5khz(no even distortions...not that good) and -77db h2 at 1khz on 32 ohms, but with lm6172 with both outputs of a chip in parallel i can go safely with 32 ohms cans and extremely low distortions.
The buffers might be useless but LH0002 military version isn't exactly the bc337/327 buffer i used in simulations so i just hope that the reality will sound a bit better 🙂
The rest of those kits are just a high power voltage multiplier, +-20v and +-10.8v regulators, virtual ground generator, phono preamplifier, and split ac ground capacitor bank for the headphones outputs.Yes...i have two of them with two different capacitor banks.
The headphones amp offset might be a problem with the actual composition but that remains to be checked.The op-amps in the headph amp aren't placed in the photo as there is no clear choice for the final class AA amp.Probaly opa2132 and lm6172 will fit the bill.
The phono preamp is just aiwa c-22 on steroids.The schematic and asc file will be available soon.
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