Electronic design starts from scratch

1th chapter into the electronic technology

The first 8 chapters revolve around analog circuits: continuously changing signals

Light control Alarm

Power: USB Battery

Resistors: Resistance, power and type

According to the Joule law, when the current passes through the resistor, it generates heat, the greater the resistance, the larger the current, and the longer the time, the more the resistance heats up.

Select a resistor with a power rating greater than the maximum actual power

Photoresistors: Its resistance is inversely proportional to the intensity of light exposed to its surface; the stronger the light, the smaller the resistance, and vice versa.

Potentiometer

Switch

Button switch: With the lock button switch, press the button, the button will not rise, you have to press the button to return to the original height;

Without the lock button switch, press the switch on, the hand left button will automatically return to the original height

Dip switch: consists of several miniature toggle switches, which are independent of each other, can be used to toggle these switches with the tip of the dip switch, some closed, some disconnected

Electronic design starts from scratch