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 for the medium wave range was published in Radio Electronics in February 1958. The...
This circuit turns a relay on or off by touching the sensors or by connecting sensors at these...
This circuit, for a bulb of 6 V up to 200 mA, was found in an old Argentine publication of the...