This is one of the first radios with an integrated circuit. The circuit is from a Radio Electronics from November 1969. The circuit is powered by a 9 V battery.
Synchronized key. This circuit was found in a 1966 General Electric documentation. Modern...
This oscillator by Wien bridge is based on stabilization by a small incandescent lamp. The...
This oscillator with the PLL 4046B was obtained from a 90s Radio Electronics. The circuit...