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.
When establishing the voltage at the input of this regulator, the output voltage rises smoothly until...
We found this circuit in a documentation about SCRs from the 70s. The circuit can be implemented with a...
The operational ones used in this project are old types from National Semiconductor, since the...
