This interesting reflex receiver used a different component, which at the time was showing up. The receiver is from a 1924 documentation and used a sodion tube.
An interesting application that can be implemented with the LM139 is the pulse width modulator. This is...
This circuit converts a positive voltage to negative, with maximum output current of the order of...
This amplifier is suggested by Sanyo and can excite loads of 4 ohms with a power of 4.5 Wrms. The...