This is Morning sun alarm circuit using IC-4011 that hobby It will have sound alarm when morning like a normal clock alarm with lighting sensor same clock.
To Control speed DC motor easily with a few parts in circuit.
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.
Here is the tone generator circuit,it is small size. I use IC digital CMOS 4011 quad NAND gate.
The simple bounceless switch circuit. It is one kind of electronic switches, high quality, and low noise. They are suitable for the digital circuits. Why?
We can use a CMOS nand gate or inverter gate and two transistors into the current controlled oscillator circuit (CCO). In Figure 1 use two inverters are connected together as…