DIY DOOR BELL CIRCUIT WITH IC UM66 & TRANSISTOR BC547

Disclaimer.
video is for education purpose only. Copyright Disclaimer Under 107 of the copyright Act 1976, allowance is made for "fair use" for purposes such as criticism, comment, news reporting, teaching, scholarship and research. Fair use is a use permitted by copyright status that might atherwise be infringing. Non-profit, educational or personal use tips the balance in favor of fair use.

WARNING:
Some ideas, And Experiment can be Dangerous.
And For that you don't Risk and Damage your self
and the Environment, I am a professional in my business
with a lot of experience!
Every video, even that is completed with compliance
with the all sefty measures. Enjoy the video and Eat the sweets.
This video is for demonstration and education purpose only.
Each demonstration presents risk and hazards
that must be fully understood before attempting.
And should be performed only by professionals