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.
This network can be used in a sound project to control the tone. The circuit is from an...
This fast-acting circuit uses any phototransistor as a sensor. The circuit drives a 30 V relay, but...
This 1kHz filter with Q = 10 can be applied to any operator. The power supply is symmetrical and...