This ultra-low noise amplifier and simple power supply was found in Analog Devices documentation from the 90's. The circuit can be implemented with modern equivalent components.
Decade counters, such as the 4017, can be cascaded as sourcing signals with the frequency divided...
This oscillator is a 1950s application of one of the first types of commercial transistors, the...
This circuit was found in a documentation by A. Fanzeres making use of a grounded metal housing...