This circuit was found in a Popular Electronics from the 90s. The transistors are general purpose, and the gain depends on the ratio between R2 and R1.
This circuit uses a JFET CA3140 operational amplifier to convert a low frequency sinusoidal signal...
This circuit is from the National Semiconductor Audio Handbook. The amplifier operates with 6 V...
This simple amplifier was found in a Radio Electronics magazine from July 1970. The transistors are...