Listing for 1 CIRCUIT board with 3 switches.

Circuit Board approx 28mm x 52mm hole spacing approx 44mm.    Marked S1 ones- S2 tens- S3 hund.  As sold power connection lights red led.   Green is lit when pin 15 is grounded.  BCD output from each switch on 4 connections abcd/1248.   Pulled from NEW unsold lighting where the switches were originally used to set for DMX address.

Output lines are grounded when selected.  Positive power connection on pin 5 internally connected to pin 10.  Circuit was connected to main board which had pull down resistors.  16 pin header on rear of board as follows: . Pin1 Ones A(1)**  Pin2 Ones B(2)**  Pin3 Ones C(4)**   Pin4 Ones D(8)**  Pin5 + power rail**   Pin6 Tens A(1)**   Pin7 Tens B(2)**   Pin8 Tens C(4)**   Pin9 Tens D(8)**   Pin10 Positive power rail internally connected to Pin5**   Pin11 Hund A(1)**  Pin12 Hund B(2)**   Pin13 Hund C(4)**  Pin14 Hund D(8)**  Pin15 ground.  Pin16 Green Led active low.  There are better explanations on the web but here is how it works.

BCD Binary Coded Decimal output is ABCD or 1248.  Four wired connections (ABCD) are used to input 0-9 to microprocessor or similar. Shipped as stated below active LOW.  You could always change supply polarity and reverse the LED connection for active HIGH if desired.

0 all ABCD are floating

1 A is pulled low BCD float

2 B is puled low ACD float

3 AB are pulled low CD float

4 C is pulled low ABD float

5 AC are puled low BD float

6 BC are pulled low AD float

7 ABC are pulled low D floats

8 D pulled low ABC float

9 AD pulled low BC float