This bench circuit was found in Radio Electronics magazine from June 1958. The circuit does not have an external power supply. The circuit generates signals from 12 Hz to 180 kHz in 4 bands.
This circuit makes use of a pickup system that in modern times can be an optical fiber. The...
This circuit, which uses only transistors as active components, was found in a 1987 documentation. The...
This transmitter has a reasonable range despite operating in the 530 to 1600 kHz range. The...