This circuit allows single coil switch machines to be controlled from two, or more, locations using a SPDT and DPDT toggle swithes.
The circuit uses a DPDT relay to throw the switch machine itself. The relay is controlled by 2 DPST toggle switches in an "Upstairs / Downstairs" arrangement. Any number of DPDT toggle switches can be added to provide more control locations.
The driver reqires two capacitors for each switch machine.
The toggle switch handles do not indictate the positon of the turnout.
LEDs can be added to the circuit to indicate the positon of the turnout. An alternate LED connection methode is also shown
If a toggle switch is thrown when no power is applied to the switch machine driver, the turnout will be in the wrong position with respect to the toggles (and LEDs). Changing the position of any toggle switch after power is restored will correct the indication.
External relays can be added to the circuit.
The explanations for the circuits on these pages cannot hope to cover every situation on every layout. For this reason be prepared to do some experimenting to get the results you want. This is especially true of circuits such as the "Across Track Infrared Detection" circuits and any other circuit that relies on other than direct electronic inputs, such as switches.
If you use any of these circuit ideas, ask your parts supplier for a copy of the manufacturers data sheets for any components that you have not used before. These sheets contain a wealth of data and circuit design information that no electronic or print article could approach and will save time and perhaps damage to the components themselves. These data sheets can often be found on the web site of the device manufacturers.
Although the circuits are functional the pages are not meant to be full descriptions of each circuit but rather as guides for adapting them for use by others. If you have any questions or comments please send them to the email address on the Circuit Index page.
12 December, 2016