This circuit was found in Radio Electronics magazine from August 1966. The transistors are from the time and the power supply from the power grid is included.
This small transmitter with 2 transistors can reach several hundred meters using a 30 to 70 cm...
This circuit was obtained in a 1977 Radio Handbook. The transistor is from the era and the coils...
This charger can be used with one to four AA, AAA, C or D cells. The maximum current is given by R...