If you really have a "Yard buzzer", as in one of those big gray ones made by Wheelock, those respond to normal ring voltage (you'll need to confirm this on the name plate). You'd still need a frequency (ring) generator to run this connected to terminals RG and RB in the KSU. The buzzer would connect to any of the B1/R1 outputs. Strap the first three CA terminals together with a single wire for all three lines to ring the buzzer.


Ed Vaughn, MBSWWYPBX