Hi folks, the Micro-Audio SMPS you need for the TPS3255 is the SMPS630-SO. Single rail output. Not dual rail.
SMPS630-SO – MicroAudio
SMPS630-SO – MicroAudio
Hi Wineds,
That looks super cool! Nice job!
What type of 4 pin connector is that?
Btw, I laid have a chassis for my TPA3255!
The Warp-1 amp from LSA that utilizes this amp as the OEM core is also finally here:
That looks super cool! Nice job!
What type of 4 pin connector is that?
Btw, I laid have a chassis for my TPA3255!
The Warp-1 amp from LSA that utilizes this amp as the OEM core is also finally here:
Last edited:
Hi Wineds,
That looks super cool! Nice job!
What type of 4 pin connector is that?
Btw, I laid have a chassis for my TPA3255!
The Warp-1 amp from LSA that utilizes this amp as the OEM core is also finally here:
That amplifier looks serious and it really sounds amazing.
Hi Wineds,
That looks super cool! Nice job!
What type of 4 pin connector is that?
Btw, I laid have a chassis for my TPA3255!
The Warp-1 amp from LSA that utilizes this amp as the OEM core is also finally here:
Beautiful case X! Here is the connector :
https://au.element14.com/webapp/wcs...HllK/qB4JgpcsqTwZWnz4b6TyaDd+mhTH0hDqWON1VA==
Thanks, guys. The Warp-1 sounds unbelievable - playing Dark Side of the Moon from a TT with a premium Sumiko Blackbird MC cartridge, and new prototype LSA Phono-01 preamp, through a prototype LSA SET tube buffer preamp with volume control, which then drives the Warp-1 and playing on my 10F/RS225 TL speakers. This is one of the best renditions of "Money" I have ever heard. A couple of audio friends came by to listen to it and they both agree that it was a "goosebumps mind blowing" type of listening experience.
@Wineds: ok, cool - Amphenol PWF glass filled nylon series (12A) capable. I am used to seeing this is olive drab finished aluminum for aerospace connectors.
@Wineds: ok, cool - Amphenol PWF glass filled nylon series (12A) capable. I am used to seeing this is olive drab finished aluminum for aerospace connectors.
Last edited:
Hi Wineds,
That looks super cool! Nice job!
What type of 4 pin connector is that?
Btw, I laid have a chassis for my TPA3255!
The Warp-1 amp from LSA that utilizes this amp as the OEM core is also finally here:
Can we see the inside?
Hi Redjr,
The insides of the first unit before the wires were tidied up with zip ties is shown here:
TPA3255 Reference Design Class D Amp with PFFB
It’s not as neat as your build, LOL! But double 18ga high strand count silicone RC race car wiring is used between the PSU and amp and amp and binding posts.
The important thing is that this amp is absolutely silent with the source turned off. Cannot tell it is turned on with ears to speaker cone.
The insides of the first unit before the wires were tidied up with zip ties is shown here:
TPA3255 Reference Design Class D Amp with PFFB
It’s not as neat as your build, LOL! But double 18ga high strand count silicone RC race car wiring is used between the PSU and amp and amp and binding posts.
The important thing is that this amp is absolutely silent with the source turned off. Cannot tell it is turned on with ears to speaker cone.
In single ended mode, where I use four separate channels, what is the max clean power output I can get with 48V supply? (I'm looking for 0.01% or lower THD.)
You can find all that in datasheet for non PFFB performance. Good rule of thumb is to take rail voltage and double it for BTL mode. But for SE mode, there is no doubling. Then subtract about 4v for mosfet dropout before clip. So 44vpp is the max swing. Divide that by 2.83 for max rms voltage. Square that and divide by load (8ohms I assume). This gives about 30w clean output. By clean, I mean well below 0.01% distortion.
Here is datasheet plot of distortion vs power for 51v rail in SE mode at 4ohms (grey line). There is no PFFB here so expect added 6dB improvement with PFFB and of 8ohms, curve will be below the 4ohm.
You can see grey is about 0.01% at 30w. With PFFB probably will be ~0.007% at 48v for 30w into 8ohms.
Here is datasheet plot of distortion vs power for 51v rail in SE mode at 4ohms (grey line). There is no PFFB here so expect added 6dB improvement with PFFB and of 8ohms, curve will be below the 4ohm.
You can see grey is about 0.01% at 30w. With PFFB probably will be ~0.007% at 48v for 30w into 8ohms.
Last edited:
Thanks a lot xrk, for a very clear answer. And best wishes to all for the coming year. Let's all hope that the hope we all felt in Jan 2021, which events belied, will be real this year.
Does this board support the master-slave mode needed if multiple boards are being fed from one power supply? I believe the clocks then run a bit out of phase so that the stress on the power supply due to the switching of different boards hits at slightly different times?
Yes, there is a small Wurth micro connector in the middle of board. It can connect the clock sync lines. I assume you can use it in a bus for one master and multiple slaves. I have tested it with one master and one slave. A simple flip of the dip switch number 8 from master to slave puts a board in slave mode.
More info here:
https://www.diyaudio.com/community/...gn-class-d-amp-gb.340880/page-35#post-6387538
More info here:
https://www.diyaudio.com/community/...gn-class-d-amp-gb.340880/page-35#post-6387538
Yes, there are some solder pad jumpers on the bottom that have to be configured for PBTL mode. Also flip a few dip switches. I have not personally tested it though but it follows the TI reference design so should work.
Yes, the SBAF tour is going quite well. It’s on the third stop I think. Those guys take a long time to perform listening tests and write a review. They are quite careful and methodical though.
Yes, the SBAF tour is going quite well. It’s on the third stop I think. Those guys take a long time to perform listening tests and write a review. They are quite careful and methodical though.