haha sry i have problems figuring out how this bootstrap supply works.
would it need higher than supply voltage? thnx for info?
would it need higher than supply voltage? thnx for info?
Those capacitor are for charging gate drivers for different audio signals(various bandwidths) and those work on 12v or 5v supplies depending upon the tpa32xx you use. So a 25v cap is enough.
No need to provide additional supply. You will just fry the board. Bst means bootstrap. You can try on any ab class ic to see what it does which has a bootstrap cap. 😜
No need to provide additional supply. You will just fry the board. Bst means bootstrap. You can try on any ab class ic to see what it does which has a bootstrap cap. 😜
i was thinking that caps sees 48V + 24V and i have been using 100V caps in that place on all my tpa3255 pcbs, and that i could use small boost converters to get those voltages and simply feed those pins directly. but indeed wasted time for probably no gain.
I have a BDM8-A TPA3255 and I am powering it with a 48 volt switching power supply. The round rocker on /off with a LED switch I was using in the chassis blew probably because it is not rated for 48 volts. I have the LED in the switch powered off of a voltage step down thingy. What power switch should I use? I have been looking to find a switch but most everything is rated for 12 volts. I did find one that was rated to 30 volts.
My switch worked fine for a year at 27-36 volts with another amp board. I guess 48 volts was just to much.
Thanks Scott
My switch worked fine for a year at 27-36 volts with another amp board. I guess 48 volts was just to much.
Thanks Scott
Switches don't handle SMPS DC very well. You might try a 110v switch, switching the AC line to to your SMPS. I got a push button 110v ring led switch on Amazon.
Hi,
Switching DC is problematic due to arcing. So normal switches may not last long.
You can try a solid state switch as it does not care about arcing :
https://sound-au.com/articles/mosfet-relay.htm
Otherwise, better to put a switch on AC mains line.
Regards
Switching DC is problematic due to arcing. So normal switches may not last long.
You can try a solid state switch as it does not care about arcing :
https://sound-au.com/articles/mosfet-relay.htm
Otherwise, better to put a switch on AC mains line.
Regards
Guys,
Taking into account that TPA3255 can take max 7 Vpp at the input.
If one has the exact TI evaluation board schematic and applies the PFFB implementation as described in TI application note, how does this affect the maximum voltage signal you can feed the amp so that the chip still receives max 7 V pp?
Taking into account that TPA3255 can take max 7 Vpp at the input.
If one has the exact TI evaluation board schematic and applies the PFFB implementation as described in TI application note, how does this affect the maximum voltage signal you can feed the amp so that the chip still receives max 7 V pp?
I have a set of Fosi V3 Mono with the included 2x 5A power supplies arriving any day now. Does anyone know much about these power supplies? Ripple Current...? I wonder if a pair of Mean Well LRS-350-48 would eek out some extra performance?
@audioarchitech Fosi showed the internals and some data for the 10A variant at ASR. Maybe if you ask them...
Did aníones could compare the sound quality of the Shui Yuan Audio TPA3255 original amplifier board with this 2023 version model available in Aliexpress?:
DC19-50V TPA3255 Audiophile HIFI Digital Audio Amplifier Board Power Supply 300W+300W High Power 2.0 Dual Channel Stereo Module
It has a lot of sales and good feedback.
The OP AMPS can also be replaced and it has a similar structure but the resistors are very different from the Shui Yuan Audio TPA3255 board.
Can it be superior to the Shui Yuan Audio TPA3255 original or does it have inferior quality components?
DC19-50V TPA3255 Audiophile HIFI Digital Audio Amplifier Board Power Supply 300W+300W High Power 2.0 Dual Channel Stereo Module
It has a lot of sales and good feedback.
The OP AMPS can also be replaced and it has a similar structure but the resistors are very different from the Shui Yuan Audio TPA3255 board.
Can it be superior to the Shui Yuan Audio TPA3255 original or does it have inferior quality components?
Attachments
About finalized this build with Dual chip TPA3255, Integrated a tube preamp class A no OPamps in the pre. Im getting some noise in the tubes 2 sets, so not the tubes. All boards grounded to earth. I have ferrite magnets ac input, DC out to TPA. Im running the Tube preamps a FX AUdiotube 02 pro ive repurposed and powering it seprately via DC jack on external chassis and running anoth DC line to the preamp itself. Ive grounded the preamp output to chassis earth. ANy ideas?
