This 18 V x 300 mA power supply was found in a 1969 documentation. The integrated circuit is difficult to obtain today.
This mixer with amplification stage has two inputs, but it can be expanded. The input impedance is high...
This circuit was found in an American documentation from the 90s. It consists of a variable with a...
We found this circuit in a 1977 Radio Handbook. The JFET can be of any type and the adj can have...