We found this circuit in a 1977 documentation. The National Semiconductor's LM380 is no longer easily found, but if used on this amplifier it provides excellent reproduction quality.
We found this circuit in English documentation for PCs from 1996. The ZN448 is a very uncommon...
This circuit is from a Fairchild digital clock module shown in the March 1977 issue of Radio...
This circuit is regulated by zener and provides a voltage of 9 V. The circuit is from a Radio...