| Electronics > Beginners |
| Small switching amplifier up in smoke. Twice. |
| << < (5/6) > >> |
| Audioguru again:
I agree that the "Lab Assignment" is completely wrong to say it should be wired on a breadboard (the datasheet talks about using short but wide pcb traces) and wrong again to try the circuit without the important power supply bypass capacitor mounted as close as is possible to the IC. I am Canadian. The "special place" you bought the mounted ICs in Canada might be using cheap fake ICs from China. There are many Chinese stores in Canada. |
| John0922:
Thanks AudioGuru. I’ll do everything I can to keep the leads short. I’m guessing the place I’m buying the amp from is trustworthy because it was referred by the book author himself. |
| OwO:
If you want an easier to source micro class D amplifier IC try the NS4150, NS4158, or CS8138. These also have better efficiency and higher max output power. SO-8 breakout boards are easily found on aliexpress and soldering SO-8 is trivial. LM4667 is a bit overpriced for what it does which makes it a potential high target for counterfeiters. --- Quote from: Audioguru again on November 10, 2019, 10:27:11 pm ---I am Canadian. The "special place" you bought the mounted ICs in Canada might be using cheap fake ICs from China. There are many Chinese stores in Canada. --- End quote --- Why use "fake" ICs from China when you can get real, Chinese made ICs that perform better and cost less? |
| John0922:
Hi- I received the new amp today and set it up, incorporating the changes suggested above. It worked fine. I tried it with the wiring in the datasheet and the wiring from the book. Both worked equally well. Thanks again for all the help. -John |
| soldar:
Yay! |
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