I'm trying to build a circuit of a Doorbell, but it's very hard to find ICs from local stores.
I didn't find UM 66. So, someone told me to look for:
- 3481 series
Neither of them was found, also.
So my question is:
What other ICs could I possibly use in this circuit? Also, is there a specific site or place where I can search for some ICs and directly find equivalents/similars or it requires knowledge and experience?