In the diagram from the November 1999 Electronics Now magazine we have the way to improve both the gain and the stability of the LM386 amplifier.
This tester was found in a 90’s Popular Electronics. The integrated circuit is CMOS 4011. The...
This system of sequential LEDs has its speed adjusted in a 1 M ohm potentiometer and this speed...
With earphones connected to the output, this circuit can monitor radio signals from AM...