Board Layout with Connector
My 1919 Western Electric 50AL phone had been stripped its dial, all wiring, and terminal strips before I got it. It was brought back from France by a soldier stationed there after the Great War had ended. Perhaps it never had a dial. It was passed around the soldiers family to one relative who wanted to make it into a lamp. He never got around to making the lamp and it sat in his attic for 30 years or so until his widow gave it to me in 1964. I have used it off and on with a homemade sidetone network, and now it is up and running with a homemade anti-sidetone network
Because there were no terminals to make connections I wanted, I decided to build the terminals into the board. The terminals were made by winding tinned wire-wrap wire aroung a 4-40 screw and soldering the wire. The wire-wrapped screw was then inserted into a hole in the board and the track on both sides of the board were soldered to the wire wrapped around the screw. When the screw was removed, and the solder on the tracks was filed flat, a threaded terminal was left.
I also decided to incorporate a modular plug on the board. A piece of bus wire soldered to the board slips around the the phone backbone to hold it in place and prevent movement due to the strain from the modular plug.
Like the other boards, this simple board was made by scoring two parallel lines on the the copper with an Xacto knife for each needed separation, then peeling the copper between the lines off of the circuit board. After the separations were made, the board was sanded, and then, tinned using a water-soluable solder paste. All components except the modular connector were surface mounted.
Click on the photos below for construction details and photos.
Copyright Dale Thompson,
November 8, 2014 through
last revision on November 8, 2014