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Pizza Box v2.0 Class D amp project http://www.dcaudiodiy.com/phpBB3/viewtopic.php?f=4&t=2240 |
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Author: | tomp [ May 23rd, 2023, 12:23 pm ] |
Post subject: | Re: Pizza Box v2.0 Class D amp project |
Rich: I forgot to mention that you should note SW101 which is an NO momentary push button switch. Unless that switch is manually pushed, the circuit will not start. That was done so that if the circuit drops out from a line problem, it will not automatically restart when the voltage comes back. Often the line voltage bounces back and forth and you don't want the soft start also bouncing on and off. If it drops out, which it has for me in the past, you have to make the decision when to turn it back on. |
Author: | HAL [ May 23rd, 2023, 3:47 pm ] |
Post subject: | Re: Pizza Box v2.0 Class D amp project |
Tom, Understand. Will add a manual start button to the code to keep it from restarting and just running. |
Author: | SoundMods [ May 24th, 2023, 10:16 pm ] |
Post subject: | Re: Pizza Box v2.0 Class D amp project |
You might try mozzarella cheese for acoustic damping. |
Author: | HAL [ May 25th, 2023, 7:07 am ] | |||
Post subject: | Re: Pizza Box v2.0 Class D amp project | |||
Walt, no, I like Sorbothane of Navcom for damping. Cheese on my pizza is good. Don't let the boxes confuse you. Have installed the input and output connectors in the box for the 2 channel amp. The Pizza Box Amp +/-36V@16.7A SMPS ready for wiring to the amp modules. Using 14awg stranded Belden 1309 cables for the DC power. Will add a capacitor bank to the amp module pizza box to lower the impedance at the amp end and help filter any SMPS noise further.
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Author: | tomp [ May 25th, 2023, 7:25 am ] |
Post subject: | Re: Pizza Box v2.0 Class D amp project |
I heard that is a pretty cheesy way to achieve damping. |
Author: | brombo [ May 25th, 2023, 7:49 am ] |
Post subject: | Re: Pizza Box v2.0 Class D amp project |
Have you measured the DC offset on the amps output yet and if so what is it? |
Author: | HAL [ May 25th, 2023, 8:12 am ] |
Post subject: | Re: Pizza Box v2.0 Class D amp project |
brombo wrote: Have you measured the DC offset on the amps output yet and if so what is it? Have not powered them up, but they are DC coupled like the original version. From what I can read, they have a DC servo loop for DC offset. |
Author: | HAL [ May 25th, 2023, 11:05 pm ] | ||
Post subject: | Re: Pizza Box v2.0 Class D amp project | ||
The monoblock versions of the Pizza Box Amp v2.0 are built. Next it audio testing with an 8 Ohm dummy load to verify correct operation.
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