Multiplexer: Modification of the Multiplexer
Modification :
- IC2, pin 10 is disconnected
- IC2, pin 9 is connected to wire where IC2, pin 10 was connected to
- The SW1 between IC8 & IC7 and IC5 & IC6 is not mounted
- IC7, pin 3 is connected to IC8, pin3
- IC6, pin 3 is connected to IC5, pin3
- The Sum output to the front plate is taken from IC6, pin8
- The Sum output to the front plate is taken from IC5, pin8
- The Delta output to the back plate is taken from IC7, pin8
- The Delta output to the back plate is taken from IC8, pin8
- In series with the four output is there a 37ohm resistor with a 10nF capacitor parallel.
NB. All the 51.3 ohm resistor has to be mounted.
The cabling from the PCB to the connectors :
The conection on the PCB : | To : | The conector : |
UEH 11 | Sum IN, pin 1 | |
UEH 12 | Sum IN, pin 2 | |
UEH 21 | Sum IN, pin 3 | |
UEH 22 | Sum IN, pin 4 | |
UEH 31 | Sum IN, pin 5 | |
UEH 32 | Sum IN, pin 6 | |
UEH 41 | Sum IN, pin 7 | |
UEH 42 | Sum IN, pin 8 | |
UEH 43 | Sum IN, pin 9 | |
UEH 44 | Sum IN, pin 10 | |
UEV 11 | Delta IN, pin 1 | |
UEV 12 | Delta IN, pin 2 | |
UEV 21 | Delta IN, pin 3 | |
UEV 22 | Delta IN, pin 4 | |
UEV 31 | Delta IN, pin 5 | |
UEV 32 | Delta IN, pin 6 | |
UEV 41 | Delta IN, pin 7 | |
UEV 42 | Delta IN, pin 8 | |
UEV 43 | Delta IN, pin 9 | |
UEV 44 | Delta IN, pin 10 |
Last Modified 11 January 2019