Found in National Semiconductor documentation from the 90's, this circuit has an output current of 5 V. The integrated circuit must have a heat sink.
This three-transistor amplifier uses a JFET at the input to increase the input impedance. The...
We found this simple mixer in a 90s Radio Electronics. The used FETs are still common. The inputs...
This circuit was published in an Italian magazine Radio Elettronica in February 1976. The...