Found in a 90’s Popular Electronics, this circuit uses two CMOS inverters to generate a signal of a few hundred hertz determined by C1 and the R3 setting.
This circuit that imitates the sound of the cowboys' calls with their “louder” was found in a...
We found this circuit loader in a French magazine Electronique Radio Plans from July 1993. The...
We have in the figure a traditional amplifier configuration with operational amplifier. The source...