I bypassed the whole input section - removed the 10uF input caps and connected Lundahl LL1540 instead - to my ears a cleaner and smoother sound - but of course YMMV.
Yes, that is very true. I am referring to the es9038 dac.To get -120db thd+n on a power amplifier is an mission impossible.
Am just saying that because I want to know if the ne5532 can become the bottleneck, specially after PFFB which should bring the snr/dnr to 116/7.
And the benchmark ahb2 is rated at -118db, but cost usd 3000, so no chance of owning such.
Regards,
Kay.
Hi dubai2000,
Thanks for the info. Do you implement PFFB(post filter feedback)?
I looked at the PFFB schematic again and it seems there are some changes made in the components near the ne5532 opamps. If I bypass these and try to implement PFFB, am afraid there might be problems.
Regards,
Kay.
That's the point. NE5532's aren't bad chips just due to their age. I'm quite convinced that they really excel at the TPA3255EVM board. And please consider that they're genuine, 'cause TI surely has no motivation to sell fakes with their own products.
Best regards!
Best regards!
I built an amplifier using the 3e TPA3255 board and a linear unregulated 500W PSU. I installed the power switch between the hot from the receptacle (after the built in fuse) and the transformer.
When I switch off the power switch, the amplifier stays on and will continue playing music for 5 - 10 seconds before the capacitors drain. How can I have it actually turn off when turning off the power switch?
The transformer is 36V and the PSU is outputting ~50 volts to the amplifier board.
Am I missing a relay between the PSU and amplifier board?
I am thinking it would have a coil voltage of 110-120 and a switching voltage > 50V DC.
Is it better to let the capacitors drain or better to I am guessing prevent inrush current every time I turn it off/on?
Does anyone have a recommended chassis mount relay?
Thanks!
When I switch off the power switch, the amplifier stays on and will continue playing music for 5 - 10 seconds before the capacitors drain. How can I have it actually turn off when turning off the power switch?
The transformer is 36V and the PSU is outputting ~50 volts to the amplifier board.
Am I missing a relay between the PSU and amplifier board?
I am thinking it would have a coil voltage of 110-120 and a switching voltage > 50V DC.
Is it better to let the capacitors drain or better to I am guessing prevent inrush current every time I turn it off/on?
Does anyone have a recommended chassis mount relay?
Thanks!
No you don't need a relay, but you can use soft start board before PSU.
Hi. I'm planning to replace my inductor to a shielded flat-wire type. Is there any suggestion what brand is good? Thanks.
@FerChin79
I used to live in Dubai (many moons ago) - now I am back (in almost equally hot) Europe.
I used to live in Dubai (many moons ago) - now I am back (in almost equally hot) Europe.