# 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.

## Timing circuit with buzzer and ao

This timing circuit is realized using operational amplifiers and transistors. Element determining the timing of this circuit is the capacitor C1, which is loaded by a current source made by T1.

## Triangular wave signal generator

Using this circuit diagram can be a very simple triangular wave signal generator. The circuit is an usual rectangular-triangular oscillator used. A Schmitt trigger converts a triangular wave in one rectangular, used to charge and discharge a capacitor continuously through currernt sources. Positive current source T1 ensure charge and negative current source T2 discharge.

Trigger output alternating commands conduction of T1 and T2. If the output of IClb is logical 1 T2 conduct if is logical 0 T1 conduct.

## Frequency doubler circuit with transistors

This frequency doubler circuit, can be viewed in two ways:

input signals> 1V

input signals <1V