This circuit was found in specialized microwave documentation from the 1960s. The circuit makes use of a varicap, and the transistor is a microwave type.
In the figure we have the way to connect several 555 to obtain sequential operation. The component...
We found this simple alarm circuit in a 1981 documentation. As we can see, it is a car alarm...
) Found in a 90s Linear Technology documentation, this circuit is a fading of video signals and...