This amplifier, from Philips Databook is suitable for automotive applications. The input resistance is 60k ohms and the frequency range is 20 to 20 kHz.
This circuit was found in the ON Semiconductor's Thyristor manual of the 1980s. The high quality...
Suggested by an Electronic Engineering, this circuit uses components of the time. Modern...
The transistor used in this circuit is uncommon today. AC124 or equivalent such as AC188K and...