The surge protection circuit important! Sometimes, our electrical appliances may damage easily by little high voltage surges. We can protect this problem.
This is the Transistor tester circuit into PCB. When your project do not works, the tester electronic parts or component be what need very much.
This is a siren sound generator circuit. Which is less expensive and can create simple. The IC1 is using CD4011 (Digital Nand Gate) and the IC2 is CD4046. Operation of…
Here is the tone generator circuit,it is small size. I use IC digital CMOS 4011 quad NAND gate.