Found in an Electronic Design of 1964 this circuit has a control for the frequency and another for the active cycle the signal. The bipolar transistor can be a general-purpose type.
We found this circuit in a 90s Electronic Design. The circuit is based on a quadruple operational...
In the figure we have a circuit with two operational amplifiers 741 capable of doubling the...
This simple teaching circuit uses 5 transistors in a monophonic organ version whose notes are...