| Electronics > Beginners |
| Small switching amplifier up in smoke. Twice. |
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| rstofer:
Setting the current limit is described in the User Manual so that's a workable feature. The PS Ammeter will read in mA so you should get a pretty good indication of current, even at low values. I might still insert a DMM in series if I had any doubt about the PS Ammeter accuracy. |
| Zero999:
--- Quote from: John0922 on November 10, 2019, 07:47:42 pm ---Regarding my including a photo of the breadboard, I broke it down already but will definitely include one next time. Thanks again for all the suggestions. --- End quote --- Layout is pretty important for a class D amplifier. A breadboard is completely unsuitable. It needs to be on a proper PCB. The data sheet you linked to shows a suitable PCB layout. How long was the speaker cable? I believe these filterless class D amplifiers are designed for the speakers to be close to the IC, not on a long length of cable, which can produce voltage spikes and current surges due to parasitic inductance and capacitance. |
| soldar:
I believe the data application figure 28 contains a mistake and the only difference between fig. 28 and 29 should be the connection of the Gain Select pin and everything else should be the same. |
| John0922:
Hi Zero999- Thanks for your suggestions. Since I’m building this just as a temporary project, hopefully I’ll get away with a breadboard for the few minutes that I test it, knowing that the performance would be better on a PCB. The original speaker cables were 3 feet long, but since I’m replacing the speaker on the next go-round, I’ll be sure to keep the new cables short. Thanks again. |
| John0922:
--- Quote from: soldar on November 10, 2019, 09:59:54 pm ---I believe the data application figure 28 contains a mistake and the only difference between fig. 28 and 29 should be the connection of the Gain Select pin and everything else should be the same. --- End quote --- Interesting, so I guess I wired it correctly then. |
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