Pizza Box v2.0 Class D amp project

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Re: Pizza Box v2.0 Class D amp project
« Reply #20 on: 26 May 2023, 03:00 am »
The dual mono Pizza Box Amps v2.0 are completed and connected to the individual SMPS.    Will vent the boxes for air movement top and bottom.

Will be time to give them a try with the speakers once I do some audio testing with my 8 Ohm dummy load. 



mix4fix

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Re: Pizza Box v2.0 Class D amp project
« Reply #21 on: 26 May 2023, 03:01 am »
Do not burn down your house.

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Re: Pizza Box v2.0 Class D amp project
« Reply #22 on: 26 May 2023, 03:07 am »
mix4fix,
Will be very careful with testing.  The 8 Ohm loads will get hot, so I put them on heatsinks for extra heat dissipation and non-flammable material. 

mix4fix

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Re: Pizza Box v2.0 Class D amp project
« Reply #23 on: 26 May 2023, 03:15 am »
I am talking about the amplifiers.

Putting a entry-level subwoofer in a cardboard box when your broke and bored in the 90s is one thing. But, it's not a good idea to have heat producing electronics in an enclosed container that can catch fire is another.

whydontumarryit

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Re: Pizza Box v2.0 Class D amp project
« Reply #24 on: 26 May 2023, 03:44 am »
mix4fix,
Will be very careful with testing.  The 8 Ohm loads will get hot, so I put them on heatsinks for extra heat dissipation and non-flammable material.
You're sticking to this?
This guy is playing you. Doesn't anyone realize it?

uncola

Re: Pizza Box v2.0 Class D amp project
« Reply #25 on: 26 May 2023, 04:48 am »
The pizza box Amp would be even more epic if you added rack ears  :icon_twisted:

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Re: Pizza Box v2.0 Class D amp project
« Reply #26 on: 26 May 2023, 10:05 am »
I am talking about the amplifiers.

Putting a entry-level subwoofer in a cardboard box when your broke and bored in the 90s is one thing. But, it's not a good idea to have heat producing electronics in an enclosed container that can catch fire is another.

Only the amps and SMPS are in the Pizza Boxes, the subwoofers are in wooden cabinets made for them. 

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Re: Pizza Box v2.0 Class D amp project
« Reply #27 on: 26 May 2023, 10:07 am »
You're sticking to this?
This guy is playing you. Doesn't anyone realize it?
I know mix4fix, he is a local member of the DCAudioDIY group. 

I have seen 12in sub speakers go up in smoke with high power input.  He is not wrong when using this amount of input power for safety in the cabinet material.

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Re: Pizza Box v2.0 Class D amp project
« Reply #28 on: 26 May 2023, 10:07 am »
The pizza box Amp would be even more epic if you added rack ears  :icon_twisted:

LOL!

orchardaudio

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Re: Pizza Box v2.0 Class D amp project
« Reply #29 on: 26 May 2023, 12:43 pm »
From this, you can gauge how much power the modules will be dissipating...
Orange and Blue are efficiency for 8 and 4 ohms
Grey and yellow are dissipation for 8 or 4 ohms

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Re: Pizza Box v2.0 Class D amp project
« Reply #30 on: 26 May 2023, 12:49 pm »
Leo,
Excellent!

Looks like if I run the 4 ohm sub setup the max dissipation at ~500Wrms is about 23 watts.   That would be 4 woofers in parallel wiring load.

Should do very nicely!   :thumb:

orchardaudio

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Re: Pizza Box v2.0 Class D amp project
« Reply #31 on: 26 May 2023, 01:11 pm »
Leo,
Excellent!

Looks like if I run the 4 ohm sub setup the max dissipation at ~500Wrms is about 23 watts.   That would be 4 woofers in parallel wiring load.

Should do very nicely!   :thumb:

Yea, but in reality it will be much less because typically audio average power is about 1/8 to 10th of the peak. So if you are peaking at 500W your average power will be somewhere around 50 to 75W.

artur9

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Re: Pizza Box v2.0 Class D amp project
« Reply #32 on: 27 May 2023, 03:30 am »
The pizza box Amp would be even more epic if you added rack ears  :icon_twisted:
Don't need that.  They make those pizza racks like

https://www.katom.com/cat/pizza-holding-cabinet.html

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Re: Pizza Box v2.0 Class D amp project
« Reply #33 on: 27 May 2023, 11:09 am »

sandbagger

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Re: Pizza Box v2.0 Class D amp project
« Reply #34 on: 27 May 2023, 04:20 pm »
I want to know if you could cook a pizza in the middle if you put one amp on top and another on the bottom?
 :scratch: :popcorn:

dB Cooper

Re: Pizza Box v2.0 Class D amp project
« Reply #35 on: 27 May 2023, 05:38 pm »
Amp looks a little cheesy  :roll:

artur9

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Re: Pizza Box v2.0 Class D amp project
« Reply #36 on: 27 May 2023, 06:24 pm »
I want to know if you could cook a pizza in the middle if you put one amp on top and another on the bottom?
 :scratch: :popcorn:
Methinks getting one of those pizza racks with 3 shelves, one amp on top shelf, one on bottom, actual pizza in the middle could keep the 'za warm while listening to some raucous tunes.

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Re: Pizza Box v2.0 Class D amp project
« Reply #37 on: 28 May 2023, 02:55 am »
Well since the amp only dissipates 23.5W for 500Wrms into a 4 Ohm load, so not going to do much to keep the pizza warm.   :lol:

artur9

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Re: Pizza Box v2.0 Class D amp project
« Reply #38 on: 28 May 2023, 06:37 pm »
Well since the amp only dissipates 23.5W for 500Wrms into a 4 Ohm load, so not going to do much to keep the pizza warm.   :lol:

Means that Class A is better for this use :-)

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Re: Pizza Box v2.0 Class D amp project
« Reply #39 on: 29 May 2023, 01:50 am »
Not in summer time!  :o