Found in an Analog Devices documentation from the 90s, this circuit uses operational amplifiers from the time. The power supply must be symmetrical.
This power supply with only 4 components has basic full-wave configuration. The diodes depend on...
This two-band receiver capable of tuning medium waves and the 3.5 to 10 MHz band was sold in Japan...
This circuit was obtained in a 1974 documentation. It shows how to use a JFET as a low intensity...