This circuit was found in a 1967 US documentation. The circuit applies to modern general purpose transistors. The circuit has no offset. The power supply must be symmetrical.
This old configuration using a germanium transistor was designed to operate with variable...
In the figure we have the way to use the 555 to control loads in the bistable form. The circuit is...
This 80's circuit uses an operational amplifier of the time. The circuit can be applied to modern...