This circuit came out in a publication called Electronics Handbook of 1993. The circuit shows how to implement a good common telephone line protector.
In this circuit of the 1980s, the T1 transformer has 30 turns of 28 primary wire and the secondary...
This circuit was found in a 2005 Linear Technology sensor manual. The circuit can function as a shield...
Suggested by General Electric in a 1967 publication, this circuit makes use of an SCR of the time....