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  1. A

    Sound Level Indicator

    Oh, I see. I'll try looking for MC34072. MC33171 = 1 opamp and MC33174 = 4 opamps Can I conclude that I can use two MC33171 instead of 1 MC33172 for this project? MC33171 and 174 are available in our country. Thanks again! :)
  2. A

    Sound Level Indicator

    Hello I'm going to try this project. However, it seems that MC33172P is hard to find in my country. :( Is there a good alternative to MC33172P? Also, MC33171 and MC33174 are available. When I searched the datasheet, they have the same. Are they different? Can I use any of those 2 as an...
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