Equivalent operational amplifiers can be used on this crystal-controlled oscillator. The circuit is from old documentation and can be changed to operate on other frequencies.
This circuit adds a beep to turn on with car flashers that do not have this feature. A 47 ohm to...
In the figure we have the way to simulate an SCR using two complementary general-purpose...
This circuit different from the timer was found in an English publication from 1978. The circuit uses...