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.
Found in old American documentation, this circuit is intended for the control of heating elements. The...
This “people detector” with pyroelectric sensor was found in the April 1991 issue of Radio...
This circuit is from an old American publication, therefore using transistors that can no longer be...