This circuit was found in an Electronics World of 1969. The components of the time. The operational can be replaced by modern equivalent type.
This 1969 Philips documentation circuit makes it possible to control an engine through the sound...
This oscillator uses a general-purpose transistor that can have BC548, BF494 or 2N2222 equivalents and...
This circuit, found in a Popular Electronics from 1978, causes two LEDs to flash alternately for a...