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.
Originally intended to detect EMPs produced by tests or atomic blasts, this interesting circuit...
This circuit triggers a small water pump when the humidity detected by the sensor is reduced in a...
This circuit was found in Maxim's documentation from the 90's. The configuration uses components...
