# Do-It-Yourself 22 basic electronics circuits made with Electra I - modular electronics education KIT - do it yourself

Electra I is a education KIT containing 57 modules with electronics parts. There is described more than 20 basic circuits but you get enough parts to do more. The KIT is designed to teach young people basic skills in electronics.

You don't need other parts or tools to build projects with this KIT.

The modules are made in 100 mils (2.54 mm) grid standard and can be connected to other systems like Arduino...

KIT is powered from 2x1,5V (AA) or 9V battery.

You can build more than 20 basic circuits from our manual. From basics with LED, switches to more complicated circuits with transistors or op. amp or 555. You can try also your own circuits, you have enough parts to do hundreds of circuits.

Get your Electra I - modular electronics education KIT.

More details about theory of operation of circuits described here you can find in our manual...

## Step 1: How are modules connected

The modules are connected by standard jumper switchech or wires.
The connection is very easy...

## Step 2: Lesson #1 - Basic circuit with LED

In this circuit you can change values of R1 and explain Ohm law.

## Step 3: Lesson #2 - Circuit with LED and two switches

On this circuit you can explain Parallel circuit.

## Step 4: Lesson #3 - Circuit with LED and two switches

On this circuit you can explain Serial circuit.

## Step 5: Lesson #4 - LED brightness regulation

On this circuit you can explain function of variable resistor.

## Step 6: Lesson #5 - LED brightness regulation with resistors

On this circuit you can explain paralell circiut and Ohm law.

## Step 7: Lesson #6 - Conductivity tester with LED

On this circuit you can explain conductivity of several things.

## Step 8: Lesson #7 - Function of Diode

On this circuit you can explain function of Diode.

## Step 9: Lesson #8 - Circuit with NPN transistor

On this circuit you can explain function of NPN Transitor.

## Step 10: Lesson #9 - LED brightness regulation with NPN transistor

On this circuit you can explain operating point of NPN transistor.

## Step 11: Lesson #10 - LED brightness regulation with PNP transistor

See differences between this circuit and Lesson #9.

## Step 12: Lesson #11 - Circuit with Thyristor

On this circuit you can explain function of Thyristor.

## Step 13: Lesson #12 - Circuit with Field-effect transistor

On this circuit you can explain function of Field-effect transistor.

## Step 14: Lesson #13 - Start - Stop circuit with delay

Simple Start - Stop circuit with delay and Field-effect transistor

## Step 15: Lesson #14 - Touch sensor

Simple Touch Sensor with Field-effect transistor.

## Step 16: Lesson #15 - Multivibrator with two transistor

An astable multivibrator. You can change values of R5,R6 and see results..

## Step 17: Lesson #16 - Flashing LED Circuit with 555

LED flasher with 555. Blink rate is determined by RC circuit formed by RT2,R3 and C6.

Calculation formula: t = R . C [s;Ω;F]

## Step 18: Lesson #17 - Buzzer with 555

Similar circuit like in lesson #16. As output is now speaker.

## Step 19: Lesson #18 - Light detector

Light detector with Photo transistor. On this circuit you can explain function of Photo transistor.

## Step 20: Lesson #19 - Simple game - First Win

WARNING !! this circuit must be powered from a 9V battery!

## Step 21: Lesson #20 - Capacitor as an energy source

On this circuit you can explain how is energy stored in capacitor.

## Step 22: Lesson #21 - Sound detector

Simple sound detector with operational amplifier. The speaker in this circuit is used as microphone.

## Step 23: Lesson #22 - Polarity checker

Very simple polarity checker...