The purpose of this circuit is to convert a short-lived pulse into a negative rectangular pulse. The circuit uses a unijunction that can be replaced by an equivalent such as 2N2646.
Using LM3909 integrated circuits, this circuit was found in an American documentation from the...
This circuit was found in Popular Electronics. Its purpose is to warn the visually impaired when a glass...
Found in a 70’s documentation, this circuit can operate with signals up to 10 MHz. The operational...