Hi doc
i use 27k , a zener 4Z7 and 28Vpower for the start...... but its not working. VDD is 2,754Volt. then i checked the 3k3 for the divider....its not 3k3 --> 3562R
reset an TPS "ARK" is still 0Volt...ok....i have no 3k3 at home🙄
i try shortly to push 33V into it--> VDD is about 2.945V but the TPS"ARK" is still doing nothing=> Reset is 0V so the pin 18 of the TPA is 0V--> no sound
curious is that the MR of the TPS "ARK" is "open" but its about 2,74Volt??
did i miss something???😕
thx
chris
The levels are 2.87 2.93 2.99 (min type avg), so maybe yours not hitting 2.93V exactly. So either increase the 3k3 a bit or decrease the 27k. It's all written in the datasheet (TPS..)
...thank you Doc...its working
changed R1 to 22kR 1% and at 29,25V the circuit is working😀
at the R2(3562) its 2,986V...so its in between the tolerance.
the out pop is still audible "loud" compared to the power on plop. in my lab i use a small 4 ohm speaker. will see/hear at my good speakers what happend when the amp is ready...
thx
chris
changed R1 to 22kR 1% and at 29,25V the circuit is working😀
at the R2(3562) its 2,986V...so its in between the tolerance.
the out pop is still audible "loud" compared to the power on plop. in my lab i use a small 4 ohm speaker. will see/hear at my good speakers what happend when the amp is ready...
thx
chris
Interesting.. i haven't noticed any problems/plop with my amps. So something must be different for the 12V rails on yours.
hi
it was my mistake...i keep the freq generator on...so everything is fine.
at power on/off a soft plop is noticable.
😉
thx
chris
Fake Amp
Hi
i smal amp in a very tight housing is born😀 ---Fake Amp !...its because the heatsink on both sides😉
after some installation ad de installation rounds🙄😉 i found a good version for this housing...
opamps AD8599, muse input caps..decoupling caps 6x100µ/50 lowESR by Nichicon. voltage regulator is the original 2575 but with corrected coil and caps.
smps is the small LRS150-24 set to 28,5V ,
i tried a power indicator -small red LED at the bottom plate...but after the front panel its not really visible😛
chris
Hi
i smal amp in a very tight housing is born😀 ---Fake Amp !...its because the heatsink on both sides😉
after some installation ad de installation rounds🙄😉 i found a good version for this housing...
opamps AD8599, muse input caps..decoupling caps 6x100µ/50 lowESR by Nichicon. voltage regulator is the original 2575 but with corrected coil and caps.
smps is the small LRS150-24 set to 28,5V ,
i tried a power indicator -small red LED at the bottom plate...but after the front panel its not really visible😛
chris
Attachments
Good evening guys.
Do you think that tpa3255 is usable with a pair of 15ohm ls3/5a, without mods?
Do you think that tpa3255 is usable with a pair of 15ohm ls3/5a, without mods?
Hi Chris,
It looks really professional!
Soon the highest quality amplifiers will be made in Vienna.
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Hi Chris,
It looks really professional!
Soon the highest quality amplifiers will be made in Vienna.
😉😀
Any overheating issues? Do you think it could use a fan? or some sort of heat transfer to the case heatsinks?
Hi audio Mo
if you read the complete posts you will find a constant power/current test with 40W ouput on both channels about 42minutes...then i got 102°C on the heatsink and yes the overheat protection of the TPA chip switched off
my personlly experiance with this board is for living room listening no fan is needed
chris
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Thanks for the reply, I'm using the exact same case for my build, but I'm using this amplifier
SMPS600RS 48V 230V Power supply
The manual says it requires cooling fan, so I looked for an ultra quiet fan and found this (link below) which I'm planning to install in the back with slotted plate on the bottom rather than the top so air can circulate through PS heat sink. I can also install the fan on the top as well below the cover above the PS. The PS has the 12v aux output for that purpose.
Amazon.com: Noctua NF-A4x20 FLX, 3-Pin Premium Quiet Fan (40mm, Brown): Computers & Accessories
The fan is quiet on paper, but I'm worried about noise from interferance from the fan motor and amp board. What do you think?
Amp will be 3eaudio amp
Hi Audio Mo
well this is a "high" end smps so mine is the LRS150-24 (28) but i think this psu will not get in troubles if you will use it for living room sessions and more...🙂
if you use really the same housing then it will be very interesting how you get all this into/on the cas😉😀
chris
well this is a "high" end smps so mine is the LRS150-24 (28) but i think this psu will not get in troubles if you will use it for living room sessions and more...🙂
if you use really the same housing then it will be very interesting how you get all this into/on the cas😉😀
chris
Hi everyone,
my friends had a marked improvement in the ratings of the tpa3116 battery-powered (24 V 12 A) rather than linear or worse switching.
Have you tried to power your TPA3255 on battery power?
I'm about to get a tpa3255, but 3audio has finished, would you advise me? I will also take a finite number which we recommend you make some changes yourself
my friends had a marked improvement in the ratings of the tpa3116 battery-powered (24 V 12 A) rather than linear or worse switching.
Have you tried to power your TPA3255 on battery power?
I'm about to get a tpa3255, but 3audio has finished, would you advise me? I will also take a finite number which we recommend you make some changes yourself
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