Hi there!
I received this ak-450ub and I'd like to reuse the parts. It had a TDA7377 and was advertised as a 200W system, which is way above of what the chip specs says. I noticed that the voltage fed to it was 21v, datasheet says that max is 18.
Regarding the transformer, how many watts/amps can I get from it? I couldn't find an identical one with image search. I'd like to use it with a linear regulator to power a TDA7850.
I received this ak-450ub and I'd like to reuse the parts. It had a TDA7377 and was advertised as a 200W system, which is way above of what the chip specs says. I noticed that the voltage fed to it was 21v, datasheet says that max is 18.
Regarding the transformer, how many watts/amps can I get from it? I couldn't find an identical one with image search. I'd like to use it with a linear regulator to power a TDA7850.
Some clues:
https://www.diyaudio.com/community/...-and-cross-sectional-area.228945/post-3347571
https://www.diyaudio.com/community/threads/guessing-the-power-of-a-transformer.175677/post-2337884
https://www.diyaudio.com/community/threads/transformer-va-rating.89833/post-1050135
https://www.diyaudio.com/community/...multi-winding-transformer.247758/post-3745504
https://www.diyaudio.com/community/...-and-cross-sectional-area.228945/post-3347571
https://www.diyaudio.com/community/threads/guessing-the-power-of-a-transformer.175677/post-2337884
https://www.diyaudio.com/community/threads/transformer-va-rating.89833/post-1050135
https://www.diyaudio.com/community/...multi-winding-transformer.247758/post-3745504
Thanks!
I see that people try loading the transformer until voltage drops. In one of the threads I saw that they aim for a 10% voltage drop. Is it OK to aim for a drop of 10% in AC voltage and measure amps in the -loaded- rectified circuit with no caps?
---
My test with one of the two symmetrical outputs:
Unloaded: 16.1 VAC
Target voltage after load (10% guess): 14.49V -- it's rated 14.5.
Loaded with 10.2 Ω: 14.8 VAC
I get 1.58A 25.4W.
I think this is a ≈ 3A transformer (1.5A + 1.5A).
Does it make sense?
I see that people try loading the transformer until voltage drops. In one of the threads I saw that they aim for a 10% voltage drop. Is it OK to aim for a drop of 10% in AC voltage and measure amps in the -loaded- rectified circuit with no caps?
---
My test with one of the two symmetrical outputs:
Unloaded: 16.1 VAC
Target voltage after load (10% guess): 14.49V -- it's rated 14.5.
Loaded with 10.2 Ω: 14.8 VAC
I get 1.58A 25.4W.
I think this is a ≈ 3A transformer (1.5A + 1.5A).
Does it make sense?