Found in 1980s Electronics Design, this circuit covers 4 decades of frequencies with a unique control. A multi-turn trimpot is used for fine adjustment. The frequency range depends on C1.
This circuit detects the phase of a signal. As it is a TTL circuit, it must be powered by a...
This oscillator for practicing code with a transistor was found in Popular Electronics. The...
This high-power flasher for incandescent signaling lamps was found in a 1980s General Electric...