Found in a 1969’s Electronic Design, this circuit operates in a narrow range of voltages. Transistors can be replaced with modern equivalents.
We have in the figure a traditional amplifier configuration with operational amplifier. The source...
This circuit was found in a 1977 Radio Shack documentation. The circuit is TTL, which must be...
This circuit is suitable for modulating small FM transmitters for eavesdropping or espionage. The...