Electronic 10 way Selector Relays

This is a circuit for alternative sources selection. It combines mechanical selection using a rotating switch S1, the electronic drive of the relays RL 1-10 and also the optical indication of the selection by the Display DSP1. The function is based on the connection of the mechanical selections into 4 Bit (BCD) code. It is managed by the proper polarization of the diodes D1-10 and simultaneous convention into decimal output by IC2 which is a BCD to decimal decoder. The monitor is driven by the IC1, which is a BCD to 7- segment Latch/ decoder/ driver. We can made a lot of combinations and selections on the circuit. For instance, we may add Led' s in parallel with the RL1-10.
Electronic 10 way Selector Relays - schematic

Code BCD to decimal converter for CMOS Part List R1....4= 10Kohms C2= 47uF 25V Q1-10= BD679 R5....11= 820 ohms D1.....20= 1N4148 DSP1= Display 7 segment Common Cathode R12....21= 15Kohms IC1= 4511 S1= 1X10 Step Selector C1= 100nF 63V MKT IC2= 4028 RL1....10= 6V or 12V Relay

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