Home > Circuit Bricks > Triangle Wave Astable
UPDATED:.21:15 21 October 2013


  • This astable that produces a triangle wave output.
  • It can be used to generate sound and produces a much softer tone than a square wave astable.
  • The frequency can be altered by a variable resistor.
The whole circuit is actually a mixture of other control sections - you might be able to recognise some of them.

The frequency (or speed) at which the pulses occur is measured in Hertz (cycles per second) ranges from about 70Hz to about 800Hz by adjusting VR1.

The amplitude of the signal ranges from 2 to 7 volts.

The supply voltage can range from 9 to 24 volts.

The output signal is called a triangle wave because of the shape it produces when connected to an oscilloscope.

The range can be altered further by altering C1. This should work up to frequencies of 100KHz or more if the operational amplifiers are changed for higher frequency types.

The 741 operational amplifier (op-amp) comes in an 8pin DIL package.


When using ICs, it is always best to use an IC socket so the IC can be removed easily if needed.

Written by Phil Townshend - 2008
www.edutek.ltd.uk - Working Electronics For Students & Teachers