This circuit for audio signals was found in the March 1990 Radio Electronics magazine. The circuit uses a unusual optocoupler that can be replaced with an equivalent one.
This circuit is from an old documentation. However, it can be designed based on modern transistors...
May 2017 - The new 36V TLVx171 Series of General Purpose Operational Amplifiers from Texas...
This fast circuit was found in an ancient American documentation. Output conversion speed is 30 ns and...