This commercial receiver from the year 1958 uses two AA cells as Power supply. The circuit is intend to receive MW station and the transistors are germanium types not easy to find today.
This circuit with unijunction transistors was found in a documentation from the 80's. The trigger...
This circuit allows to activate three functions in a controlled way, determined by a diode array....
This circuit was found in a 90’s Popular Electronics. The power transistors must be equipped with...