this is probably my 2nd post here. pretty satisfied with the performance of this amp. so good I bought 3 to play around with. one of the 3 is modestly modded with better input caps and more compliant filter caps. wanna try replacing the inductors but I don't have the necessarily skills to execute it. maybe in the future.im surprised how dead quiet these board are.
https://scontent.fmnl4-2.fna.fbcdn.net/v/t1.0-9/118160798_10223632505820965_8844623376001028589_n.jpg?_nc_cat=105&_nc_sid=8bfeb9&_nc_ohc=4D8JhbzDi6UAX-hKuyL&_nc_ht=scontent.fmnl4-2.fna&oh=89692fcad80bdbee265c0c3395c98a9d&oe=5F8B020A
An externally hosted image should be here but it was not working when we last tested it.
My TPA3255 with PCB 3e Audio, tube preamplifier, 44VDC 20,000uF linear power supply, motorized volume control, "alps" potentiometer.
I think I will have to add a cooler in this case because with this voltage of 44VDC the amplifier's heat sink is getting very hot and I don't like it, even though the fault LEDs or clip_owt aren't lighting up.
The sound is very good, very good, driving 5 ohm speakers with powerful bass without sacrificing the mid and high frequencies.
I am really enjoying the amplifier and listening to music all the time during the weekend and now during my work at home office.
My signal source is an UP2STREAM PRO V2 card where through it I access a DLNA server with my FLAC collections or my playlists on Spotify.
It's a very nice system.
I hope you enjoy watching my work.
I think I will have to add a cooler in this case because with this voltage of 44VDC the amplifier's heat sink is getting very hot and I don't like it, even though the fault LEDs or clip_owt aren't lighting up.
The sound is very good, very good, driving 5 ohm speakers with powerful bass without sacrificing the mid and high frequencies.
I am really enjoying the amplifier and listening to music all the time during the weekend and now during my work at home office.
My signal source is an UP2STREAM PRO V2 card where through it I access a DLNA server with my FLAC collections or my playlists on Spotify.
It's a very nice system.
I hope you enjoy watching my work.
Attachments
70’s Upcycle
My amp case was too small and was getting really warm so I found this 1976 Trio KA-1500 on eBay which was only working on one channel for £28. I used the Trio power switch and LED as well as the pots to mount the knobs.
Spec:
3EAUDIO TPA3255
Douk 400w 48v dc SMPS
Khadas Tone Board DAC
10k SMD DACT type attenuator
RaspberryPi 3B+
iPad usb charger
240vac relay
Toggle switch for the RaspberryPi
Fuse holder
4xSpeaker Terminals
2xRCA sockets (not used yet)
My amp case was too small and was getting really warm so I found this 1976 Trio KA-1500 on eBay which was only working on one channel for £28. I used the Trio power switch and LED as well as the pots to mount the knobs.
Spec:
3EAUDIO TPA3255
Douk 400w 48v dc SMPS
Khadas Tone Board DAC
10k SMD DACT type attenuator
RaspberryPi 3B+
iPad usb charger
240vac relay
Toggle switch for the RaspberryPi
Fuse holder
4xSpeaker Terminals
2xRCA sockets (not used yet)
Attachments
latest build. based on tpa 3118 mono boards off AE. not bad for 3 dollars a pair board!built as early xmas gift for a friend in the US
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
D
Deleted member 148505
D
Deleted member 148505
can't test it yet, voltages are good but not enough parts to test for performance. Here's the pic.
Attachments
Thanks Bro
By the way, Merus Infineon chip really work well ! Impressive amplifier for multi purpose use. A french Member from DIY came to test it with some other amplifiers yesterday. We compare it to the TPA3251 VS TAS3251 VS Last Class H amplifier. I wish we could share a quick review soon
TPA3255
Here is my latest project. The VU/Power meters work but they need about 80w to really get moving. The power switch and volume are connected. I have updated the speaker terminals. Inside is a 48vdc 400w smps, 240v relay for the smps, RaspberryPi 3B+, Scarlett Solo gen3 balanced DAC and a 3eAUDIO TPA3255 with an opamp bypass.
I think it looks and sounds great. I would like the power meters to work differently so they worked off the source, just moving to the music even at low volume.
Here is my latest project. The VU/Power meters work but they need about 80w to really get moving. The power switch and volume are connected. I have updated the speaker terminals. Inside is a 48vdc 400w smps, 240v relay for the smps, RaspberryPi 3B+, Scarlett Solo gen3 balanced DAC and a 3eAUDIO TPA3255 with an opamp bypass.
I think it looks and sounds great. I would like the power meters to work differently so they worked off the source, just moving to the music even at low volume.
Attachments
It looks like a pair of Neurochrome SMPS-86 boards, but they're no longer listed on the site. you might be able to find details via archive.org.
Very cool! I'm doing something similar but using an old tuner (couldn't bring myself to sacrifice a classic amplifier)
That came out very nice. Are both of those power supplies needed? Could you get away with a single rated for both?
With this dual configuration of this board do they run completely independent with each left and right mono balanced input? Or do the boards have a dual mono audio processor on them to help speaker audio out put stay perfectly in time?
Any photos of these other side of the boards?
Got my attention. Thanks for sharing.