This circuit was found in a 80s American documentation. The zener diodes determine the points of action of each stage and the transistors can be general purpose types.
Using a pair of period A/D converters, this 3-digit circuit was found in the 1992 Radio...
The transistors and integrated circuit used in this amplifier are no longer common today. For...
May 2017 - ROHM is announcing the availability through Mouser Electronics of a broad line of fast...