The transistor used in this circuit is uncommon today. AC124 or equivalent such as AC188K and 2N2431 can be used. The circuit is from the 80's and makes use of transformers.
This circuit was found in a documentation for radio amateurs from the year 70. Its purpose is to...
We got this circuit in an old publication from 1978. The circuit uses a phototransistor and an...
This simple transistor radio with only two germanium transistors was found in a Japanese magazine from...