"One week's work on Analog Electronics" - optocoupler and other components

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One 、 Optocoupler

To achieve one **“ electric - light - electric ”** Transformation

The picture below is TLP521 Important parameters in the data book of ：

The simulation schematic diagram is as follows ：

The optocoupler transistor shall pay attention to the inconsistency between the left power supply and the right power supply , Because if there is an interference signal in the power supply , Will achieve an isolation effect .

Two 、 Sound producing device

chart 1： horn , Nonpolar devices , Passive buzzer （ There is no oscillator inside ）, So DC cannot drive , need 2KHz-5KHz The square wave can be driven to make it sound .
chart 2： Buzzer , Have polarity , Active buzzer （ There is a vibrator inside ）, To give 1.5V-15V After the voltage is applied, it will make a sound .

Two 、 Relay

It's a kind of “ Automatic switch ”, Through low voltage 、 Low current to control high voltage 、 High current .

Relay terminology ： Normally open and normally closed contacts
application ： Often used in The switch speed is not high The occasion of
The simulation diagram is as follows ：

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3、 ... and 、 Nixie tube

Using the dial switch to control the digital tube display, the numerical simulation is as follows ：

Four 、 Transient voltage suppressor （TVS）

It's a kind of High efficiency protection device in the form of diode , Prevent transient high energy shocks , Protect precision devices from damage by surge pulses .
effect ：