Atlas Sound CP400 Audio Amplifier Repair And Test

Рет қаралды 4,194

5 ай бұрын

Let's repair and test this Atlas Sound CP400 commercial grade audio amplifier without using a schematic. The 70 volt distributed audio system is also discussed with a test demonstration.
#audioamplifier #electronicsrepair #learnelectronics

Пікірлер: 21

@justiceas9444 3 ай бұрын

Thanks for posting this and for taking the time to explain in detail. I have two of the CP400 Amps and was experiencing the same symptoms. The fix was replacing those 3 caps as shown in your video. The fan resistor on one of my units is in "new condition". 4 band resistor (Red, Red, Brown, Gold).

@EriksElectronicsWorkbench 3 ай бұрын

The caps should have been 105C rated so a weak point but the repair is easy enough. Your resistor color code is 220 ohms. Mine was measuring 290 ohms no doubt damaged from the heat. The 150 ohm replacement worked well. I think the 220 ohm puts the fan right on the edge of stalling out. 150 ohms gives a little safety margin. Thanks for watching!

@MrLinuxone Ай бұрын

Enjoy very much your explanation, glad I found your channel. Hope to see more of your video in the future.

@EriksElectronicsWorkbench Ай бұрын

Thanks for watching and I'm happy to know you enjoy the content on my channel.

@jonka1 5 ай бұрын

Very enjoyable and thank you for your excellent demonstration of the distributed audio setup.

@EriksElectronicsWorkbench 5 ай бұрын

Thanks for watching, glad you enjoyed the video.

@MichaelBeeny 5 ай бұрын

I tend to use an AC mains fan with full power being that of the mains voltage. The normally open thermal switch would have a capacitor across it giving a normally slow run. As the switch heats it shorts out the capacitor giving a full supply to the fan. The capacitor generates no heat in use, unlike the resistor. Regarding the transformer bolt, be sure it cannot make a complete circuit should the bolt touch the top of the lid. If it's close, a piece of insulation material will prevent something nasty happening.

@michaelcarey 4 ай бұрын

Yes, keeping the transformer bolt isolated is VERY important. A shorted turn is a bad thing and a LOT of current can flow.

@radiologe9271 5 ай бұрын

how will this amp ever break again ? Great Job !

@carloca71 5 ай бұрын

Nice repair and thank you for sharing that amount of information. Sadly it looks the trend: expensive equipment loaded with el cheapo caps :-(

@EriksElectronicsWorkbench 5 ай бұрын

Thanks for watching! Yes for the cost of this amplifier better ratings on the capacitors would be expected.

@brianwood5220 5 ай бұрын

Excellent job, Erik. I really appreciated the explanation on the distributed voltage speaker system and how they work. Does the type of transformers used effect the frequency response output at the speaker? Thanks for sharing.

@EriksElectronicsWorkbench 5 ай бұрын

Thanks for watching! Yes the transformer will have an affect on the frequency response. Typically they are not hi-fi grade so the extreme ends of the audio spectrum roll off a bit sooner with these transformers but typically not an issue given the purpose of distributed audio applications. I'm sure there are very expensive transformers that perform well if that audio quality is needed.

@brianwood5220 5 ай бұрын

@@EriksElectronicsWorkbench Thanks for your response.

@lnglng6961 5 ай бұрын

❤🎉

@sebastian_harnisch 5 ай бұрын

Thanks for sharing the video! Never came across the distributed audio system, so I learned something knew today ;) Would these kind of systems still be used today?

@EriksElectronicsWorkbench 5 ай бұрын

Yes the distributed audio system is very common in commercial setups and is used in modern systems.

@MichaelBeeny 5 ай бұрын

I used a 500-watt mono power amplifier in multiplex cinemas for the piped music in the foyer, corridors, toilets etc. The main advantage of the 100volt system is almost no loss on long cable runs. Each speaker or speaker cabinet can have the correct level set. Foyer cabinets may have a 40-100 watts each were as a speaker in the toilet might only be set to 1 watt, possibly less. As for quality, this can be very good. All depends on the transformers used. Small cheap ones have poor bass and treble. But fine in low level applications like toilets and corridors. Such amplimers tend to be REALLY big and heavy..

@jedi-mic 5 ай бұрын

Why didn't you utilise the power filter capacitors and use both banks considering it was there and use on each one a lower capacitance. What's the name of that box that's eliminates hum called

@EriksElectronicsWorkbench 5 ай бұрын

After examining the unused filter cap positions I found they were connected in series with the existing cap on the rail. This would allow for higher voltage DC rails in the higher wattage version amp. Installing caps in series will not increase the capacitance value so there was no advantage to add them. The box is called Buzz Off HE18 made by Rolls. Parts Express has them.