This circuit is used in magnetic tape recorders, having been found in documentation in the 1960s. The circuit uses Japanese transistors, and the critical components are transformers.
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...