Tone relays - technical data
  • maximum switching voltage: 40 V
  • maximum output current: 3.5 A
  • temporary output current: 20 A
  • input voltages: TTL levels
  • dimensions: length depending on number of relays x 40 x 14 mm (the given height takes into account elements on the bottom side of the board)
  • parts height above the board: 11 mm
płytka przekaźników tonowych - widok z góry   płytka przekaźników tonowych - widok z dołu  

 The tone relays are usually used to reduce the load of contactors, that is, to reduce the wear of contactors used to turn on/off pipe valves. In our modules, we use electronic relays. The active element is the Power MOSFET transistor. Relays require additional quench diodes or varistors to suppress overvoltages. These parts are not soldered to boards because of lower suppression efficiency. They should be mounted directly on coil terminals.
Because of specific nature of conduction of MosFET transistors, all their sources are short-circuited on the board and grounded to the board. That ground should be short-circuited with the organ power supply ground. Only one electromagnet terminal is connected to the relays. The second terminal should be connected to the positive terminal of the organ power supply.
The relays are placed on boards in groups of 12. A single board includes as many relays as there are keys in a single manual or pedal (the way of placing relays on the board can be changed according to the order). Outputs are also in groups of 12. Connectors are made of pins which are placed in one row every 2,54 mm. The installed connections can also be changed according to the order.