Introduction - If you have any usage issues, please Google them yourself
With different components, so as Sasser triangular shape, the above measured using oscilloscope waveform is almost! LM339 and LM324 is very close to the components, I have been doing with oscillation LM339, LM324 do not used oscillation. But the actual need to use oscillations, but also with signal amplification. in the circuit at the same time would require the use of these two core, in order to save costs and would like the next, LM324 oscillation can do only one more transistor. Such a core can be less, and