Found in a 1990s Popular Electronics, this circuit uses two transistors to boost the power of a 741 with audio signals. The power depends on the transistors used, which can be general-purpose types.
This timing circuit was found in old documentation. The technology is CMOS. The supply can be made...
This circuit was found in a 1967 General Electric documentation. Tunnel diodes can oscillate at very...
This circuit can be used in a signal level indicator with LEDs. The circuit is from an Electronics Now...