[Editor's note: A reader has brought to our attention that this article has missing figures. Both the ZL30406 and ZL30407 are obsolete (no longer made or stocked as of checking on 12/14/2024) ...
The circuit is a triangle waveform generator that uses as few parts as possible. A 555 timer IC, 2 resistors and two capacitors make the triangle wave. The IC is connected in a 50% duty-cycle astable ...