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Chip Amps Amplifiers based on integrated circuits

8 x TDA7293(HS) PARALLEL DIY
8 x TDA7293(HS) PARALLEL DIY
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Old 14th October 2019, 01:39 AM   #1
AmokRun is offline AmokRun  Albania
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Join Date: Oct 2016
Location: Korce
Default 8 x TDA7293(HS) PARALLEL DIY

Hello to everyone on this site!
My first post here but not my first visit

I'm a father of two, my first hobby is painting and second is electronics.
(my electronic language is not so good too) please be nice......


A BIG thank you to all for the help and knowledge i received from this site and helped on my project. I want to share it here with you. Started about 2 years ago and still have some work to do.
2 monoblocks amplifier based on TDA7293. Started as a joke with spare parts and some cheap PCB from ebay and finished with a total of $1500 (with spare parts). The joke ended when i tested and compared my amplifier on same speakers with Brinkmann Integrated and a Icon Audio Stereo40 MKIII integrated valve amp. There is a long story to explain but in the end my amplifier sounded much better on my ears then other 2. They are 2 monsters of 33kg each. There are 48 x 33000uf/50v each one amp.
Transformer 21-0-21 (core 14.5cm x 6cm x 4cm, primary wire 0.9 and secondary wire 2.45) All cap connection, vcc+vcc- and basic ground are made with cooper wire 4mmx2mm. All other connection i used solid wire 3mm and 2mm. I designed my own PCB based on heatsink removed from an old burned amplifier. I removed some legs of tda from pcb and used wire on air to make the connections for this legs. Buffer, mute, stand-by, output and removed totally nr 5. Much more space on board for the vcc+ vcc- and more work for my hobby The design is the same as tda datasheet provides except the value changes on C1=5.6uf, C2=470uf, C3,4=100uf, C5=470uf x 8pc.
With this transf. there are ~50w for ic. I believe i have 400w per side on 8 Ohms. Calculation from here: YouTube
I'm using a start soft from ebay but changed everything (same value but Mouser parts) on board except transformer and relay. No preamp and for the moment i'm using Chinese 2Pole 23 Step Rotary Switch Attenuator Volume Control Pot with Dale resistors 1%. Mdf boards and L iron profile 2.5cm for the case. All parts from Mouser except IN cap Mundorf from HIFI Collective.
Very little noise (fsss) only if i put my ear literally on tweeter.
When i play my aelite 3 looks like the speaker will come in my face and smash me on the wall.
Hope you like this one.....
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Last edited by AmokRun; 14th October 2019 at 02:15 AM.
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Old 14th October 2019, 02:23 AM   #2
AmokRun is offline AmokRun  Albania
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Join Date: Oct 2016
Location: Korce
Some other photo's from transformer build.
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Old 14th October 2019, 02:28 AM   #3
AmokRun is offline AmokRun  Albania
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Join Date: Oct 2016
Location: Korce
Heatsink build.
2 same amps burned with 4 same heatsink. 2 used as was and 2 others cut in half and used as extension on side
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Old 14th October 2019, 02:30 AM   #4
AmokRun is offline AmokRun  Albania
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Join Date: Oct 2016
Location: Korce
RCA IN from old PC CPU
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Old 14th October 2019, 05:40 AM   #5
asuslover is offline asuslover  Romania
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8 x TDA7293(HS) PARALLEL DIY
what a monster! great job!
I would be curious about the schematic, not familiar with tda7293 but nor sure where you got the estimated amp power into 8 ohms . Maybe 400w into 1 ohm...
The transformers are good but I would probably use 25-30v transformers , so around 35-40v dc to take full advantage of the parallel chips .
Why 8 chips /channel? I bet they barely get warm.
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Old 14th October 2019, 09:54 AM   #6
AmokRun is offline AmokRun  Albania
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Quote:
Originally Posted by asuslover View Post
what a monster! great job!
I would be curious about the schematic, not familiar with tda7293 but nor sure where you got the estimated amp power into 8 ohms . Maybe 400w into 1 ohm...
The transformers are good but I would probably use 25-30v transformers , so around 35-40v dc to take full advantage of the parallel chips .
Why 8 chips /channel? I bet they barely get warm.
My first attempt was with 28-0-28 ac around 40v dc. the high was not so sweet and clean.
There was some kind of disortion. As datasheed recomend 30v dc i follow that. They was right. I just make the PCB design for 8 IC thinking to change the speakers later with bigger one. Here in the end of the video are calculated the watts of tda :
YouTube
after 4 hours of work the heatsink is about 50.C And the transformer 40.C
There are 400watt/8Ohm of power.
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Old 14th October 2019, 10:58 AM   #7
augustoriodosul is offline augustoriodosul  Brazil
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A real diy, good job. Congratulations AmokRun
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Old 14th October 2019, 01:51 PM   #8
asuslover is offline asuslover  Romania
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8 x TDA7293(HS) PARALLEL DIY
The YouTube video shows you the power for a single chip,
When you parallel chips you will be able to achieve very high power levels into very low impedance , but having 8 ohms impedance will not be a benefit for this amp.
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Old 14th October 2019, 06:36 PM   #9
AmokRun is offline AmokRun  Albania
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Join Date: Oct 2016
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Quote:
Originally Posted by asuslover View Post
The YouTube video shows you the power for a single chip,
When you parallel chips you will be able to achieve very high power levels into very low impedance , but having 8 ohms impedance will not be a benefit for this amp.
Believe me, you can load 0.5Ohm but, will play much easier the 8Ohm and more easy 16Ohm load then 4Ohm load and less. If i want to have a good HI-FI sound on 2Ohm load you must have a battery or ...lets say 3-4.000.000uF per side.
And with good HI-FI sound i have always in mind the test i made with amplifier that cost ~$2000 and ~$4000
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Old 14th October 2019, 09:51 PM   #10
asuslover is offline asuslover  Romania
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8 x TDA7293(HS) PARALLEL DIY
Ok ,if single chip amp can be hi fi driving 4 ohms , then 2 of them paralleled will be hi fi into 2 ohms , with just double (or more) of the capacitance required for a single chip. Of course if the amp is designed the right way...
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