The circuit is from the 1977 National Semiconductor Audio Handbook. The bass and treble control is Baxandall type. The integrated circuit used is not common today.
This circuit works with the previous one, generating counting pulses for random draws. The circuit is...
This circuit was found in Popular Electronics. Its purpose is to warn the visually impaired when a glass...
This circuit is from an American magazine that no longer exists, Modern Electronics, in a February...