This circuit, obtained from a 1965 magazine, can still be assembled using some modern equivalent components. The transistors may be BC558 and the transformer is obtained from a disused transistor radio.
This circuit was found in a 90s Popular Electronics. It can generate signals from 3 to 10 MHz....
The integrated circuit used in this National Semiconductor project is not the most common and the...
This circuit was found in General Electric documentation from 1965. The transistors are from that...