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Various simple electronics projects for beginners

Various simple electronics projects circuits diagrams for hobbyist and beginners . Simple circuits, mini projects with diagrams and description from many electronics categories.

SIM card reader circuit schematic

Using this schematic circuit we can make a very simple SIM card reader . The SIM card reader circuit is based on the MAX232 circuit  and require few external components . This SIM card reader circuit require a 5 V external power supply  . This SIM card reader needs a PC software to work .
All capacitors are 10uF polarized and the R1, R2 resistors value is 220 ohms . The D1 is a red LED and D2 is a green LED .

The pin description for SIM card are :

Vcc  - 5V power supply

Reset – signal reset

Simple light detector circuit project

This circuit is a very simple light detector circuit which use few external components  . The light detector circuit is based on a 741 operational amplifier and a LDR (Light Dependent Resistors) which is used to sense the light intensity .

Overvoltage and undervoltage monitor schematic circuit

Using this electronic schematic circuit we can monitor the voltage of some power supplies or the voltage of other circuits .

This circuit is very simple an required few components . The monitored voltage for this  undervoltage and overvoltage monitor circuit is maked using two Zenner diodes  . If the value of the monitored voltage goes below or above the value of the zenner diodes the LED will light .


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