Triangle wave and square wave generator circuit installed with NE555

Filter 18.432M

As shown in the figure, a triangular wave and square wave generator is built using the NE555 timer IC. This circuit uses two constant current sources to charge and discharge a capacitor linearly, which results in the generation of a triangle wave. The output of this waveform can be converted into a square wave by using a comparator or a Schmitt trigger.

The first part of the circuit consists of transistors VT1 and VT2 along with resistor R1, forming a constant current source that charges capacitor C2 in a linear fashion. The second part includes transistors VT3 and VT4 with resistor R2, creating another constant current source for the linear discharging of the same capacitor. This controlled charging and discharging process ensures a stable and consistent triangular waveform.

This type of circuit is commonly used in signal generators, function generators, and various electronic testing equipment. It's a simple yet effective way to produce precise waveforms without the need for complex components. The NE555 provides stability and ease of use, making it a popular choice among electronics enthusiasts and engineers alike.