Datasheet of This battery powered intercom was found on a January 1947 Radio Craft. |The circuit is 4-way but can be modified by changing the key.
This circuit was obtained in a Motorola documentation from 1966. The circuit can use a common FET...
Found in Electronics Now from the 90s, this circuit can use any general-purpose transistor. The power...
The integrated circuit used in this trigger is uncommon today. We found it in a documentation from...
