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6-channel power amplifier for home cinema

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Vermes

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It is a design of 6-channel power amplifier for cinema system. Unlike expensive factory elements of home cinemas, this one can be made in any electronics workshop.

Electronics:
The power amplifier is for 3x stereo uniamp, which gives in total 6 channels. Common power supply for all the channels solved the problem with the ground. Uniamp should be run on an external power supply based on a toroid 750W 4x37V 1x15V. Toroid outputs were connected in parallel, what gave 2x37V, 15V is not used. 25A flat bridge with connector therminals is placed in the power supply. Capacitors in the power supply 4x16000uF/75V with screw terminals. Power goes though thick cables to the bus, where it is divided into boards. Amplifier is equipped with softstart. You can turn the amplifier on by a 12V relay powered from the transformer 2,5W 12V-AC, and you can control it by a switch on the panel. All that is placed above the softstart board. You can also turn it on via remote input 12V. Thermistors should have a hole with silicone paste.

Signal cables are shielded. Output 2,5mm2 OFC.

Housing:
Housing was made of aluminum. Bottom board made of 8mm aluminum, was painted half-matt. There is a milling in the middle of it, because the capacitors turned out to be too high. Rear was also milled of 8mm aluminum for terminals and connection sockets to approximately 4mm.

Front panel was made of 10mm aluminum with handles made of aluminum blocks. The handles are necessary, because it would be very difficult to carry the power amplifier, as it weighs more than 20kg.

List of elements:
  • toroid
  • uniamps
  • heat sinks
  • capacitors
  • switch
  • softstart
  • RCA and banana sockets
  • 25A bridge
  • housing



Link to original thread - 6-cio Kanałowa Końcówka Mocy Do Kina Domowego by maxdila
 

I assume you didn't notice that this is the DIY section so he is not asking anything ,he is just showing a DIY project.
 

Vermes has posted a lot of DIY projects , they are projects originally posted to Poland version of EDAboard ( **broken link removed** ) and he translates them to English and repost them here.
 

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