Just change to 12s and you should be ok. You can always use a combo that gets about 12v and then go to a DCDC step up to get regulated 51.5v even as cells drain and voltage changes. I have used the 10A (red PCB) DCDC units from Aliexpress (shown earlier in this thread) with success. I ran it from 12v Pb-acid UPS backup battery.
just this Mod for this 3255 board??I bought this TPA3255 Board.
View attachment 1240285
Four capacitors beside heatsink are series-connected 4700uF/25V.
So a total of 4350uF capacitance is embedded.
It's not a good idea from the point of view ESR.
By the way, another complaint...
The speaker output makes a pop noise during Power-up and Power-down. So I developed an automatic reset control circuit.
This can eliminate pop sound without manual reset switch control operations.
View attachment 1240288
Hope this will help you easier.
CyberPIt
Member
Joined 2018
Sound-related modification is yes.
Other modifications are adding LED drivers for CLIP(RED, pin21), FAULT(BLUE, pin19), and GVDD Power(GREEN).
Yes i could use 12S but i find better and cheaper charger for 13S thats why i actually want to use 13s. I have step up converter 500W from wondom. But it does use 12W in idle mode. therefore its not very efficient. i want to get most out of battery
i know 53.5V on 6ohm. i will use 4ohm driver. but the specs does also say, that it can handle 69V (or 63V) before damage. so i wonder i can use 54.6V for short term before battery start loose its max current...
I purchased the ZK-3002 amp, it is the updated board, and am using with a Noyito 48v 4a (192w) rated 5a (240w) max (WX-DC4816). It's connected to a JBL Sub 145 (8" ported enclosure) in place of the failed 100w plate amp that i'm the process of repairing. In this example also have it connected to a low-pass subwoofer pre-am board that is being powered by a 12v DC power board. This is just a mockup test and does get very loud that my wife complains of the vibration so I have to turn the volume down to not disturb her.
Any long term success stories using the auctionsite 3255 boards?
I have a 1kva 32-0-32 transformer here and a buddy who needs a big cheap amp for his pa party speakers.
Almost bought the one with the series power supply capacitors, then decided to do a search first. Seems they mostly all have issues.
I have a 1kva 32-0-32 transformer here and a buddy who needs a big cheap amp for his pa party speakers.
Almost bought the one with the series power supply capacitors, then decided to do a search first. Seems they mostly all have issues.
hi，hansueli
I saw it in the data book that the magnification（NE5532） of the device is 1。(R8/R7)×（R41/R42）=1.
So why do I need it? If there is no amplification, can I remove it?
I would appreciate it if you would kindly enlighten me.
hi,
I am thinking on building a TPA3255 board - well, a few of them for a multichannel system - based on the eval board.
What prevents the project from being economically viable are the inductors. I have not read through the 254 pages of this thread but i searched a bit and couldn't find an answer to my question:
have inductors been identified that are significantly cheaper than the coilcraft & co. and proven to give similar performance?
thanks a lot!
I am thinking on building a TPA3255 board - well, a few of them for a multichannel system - based on the eval board.
What prevents the project from being economically viable are the inductors. I have not read through the 254 pages of this thread but i searched a bit and couldn't find an answer to my question:
have inductors been identified that are significantly cheaper than the coilcraft & co. and proven to give similar performance?
thanks a lot!