This circuit was found in a Signetics documentation from the 1980s. Next to the figure are the waveforms of the generated signals. The transistor admits equivalent.
This 1969 Philips documentation circuit makes it possible to control an engine through the sound...
We find this circuit in the manual of the used integrated circuits. The manual is from Linear...
This circuit can be used as a residential doorbell. We found it in an English publication from...