This converter/decoder BCD to DEC is a simply but very powerful device. It decode from BCD data in TTL logic to one of eight. You can use it everywhere you have less wires than you need and also with BCD (TTL) output devices (like microHAM). You need only 4 wires and control up to 8 outputs. There is universal output driver. You can drive outputs by switching to GND or + Vcc voltage. BCD inputs include RF and high voltage protection.

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Applications
Open collector device
BCD to DEC
Schematic
PCB
Product details

Applications

Matrix table for inputs and outputs

Connection of control cables and power supply

- with external power voltage wire
- one more wire
- BCD wires can use smaller voltage 2.6 to 9 V
- for longer distance

Output 0 to 8

- compatible with MFJ antenna switch
- easy to set by jumper

Output driver

- universal outputs - switching to GND or + voltage
- easy to se by jumper
- easy to replace driver ULN (- out) / TBD (+ out)

Example with 6-to-1

- need four (five) wires between controller and BCD to DEC converter
- GND, (+12V) and three control wires
- output must be with TBD driver (+ out)

Example with 4-to-1

- need four (three) wires between controller and BCD to DEC converter
- GND, (+12V) and three control wires
- output must be with TBD driver (+ out)

Example with microHAM devices

- need four (three) wires between controller and BCD to DEC converter
- GND, (+12V) and three control wires
- output must be with TBD driver (+ out)

Example with 6-to-2 microHAM devices

- need four (three) wires between controller and BCD to DEC converter
- GND, (+12V) and three control wires
- output must be with TBD driver (+ out)

Open collector device

- devices with the open collector (like B26-PA RF2K-S) needs external pull up resistors

BCD to DEC

Schematic

PCB