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.
This filter is suggested by the Texas Instruments Linear Circuits Applications, 1986 edition. The...
With each touch on S1, an output of 4017 is activated, this in sequence 3, 2, 4, etc. These...
This inverter for 230V (220V) loads was found in the 2021 Internet documentation and is based on...