6 Channel Relay Driver Card

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RELAY DRVE P1981-720PX.jpg

Features[edit]

  • Drives relays on QRP Labs Ultimate relay-switched BPF/LPF kit
    • Drives either receiver Band Pass (BP) Filters or transmitter Low Pass (LP) Filters
    • Open collector to turn on/off relay
    • Drives low to turn on relay
      • Other side of relay pulled up to 5V
    • User should only turn on one output at a time
  • Inputs
    • 6 channels (5 used with Ultimate Relay Card)
    • Active-high in to drive relay to on state
    • 3.3K to transistor base
      • 1 mA for 3.3V drive
      • 1.5 mA for 5V drive
  • Outputs
    • Open Collector outputs from 2N3904 NPN transistors
  • Power
    • 9-14V power in
    • 5V power out to power relays
    • DC jack
  • 36x37mm card
    • 3 PCBs for $11 from OshPark

Ultimate Relay Card[edit]

Ultimate Relay Card 5.jpg

Ultimate Relay Card Connections[edit]

  • The RF input is the RFI pin of the 2 x 5-pin header on the left of the board (same as in the Low Pass Filter kit usage)
  • RF output cut the track from the SMA connector center pins and add a wire to connect it to the common bus track that runs horizontally across the board, finishing at the "RF" pad circled in yellow
  • Cut/Jumper
    • Cut on top side near Vertical SMA
    • Jumper on rear side

SWITCHED FILTER Cuts.PNG

  • Jumpers

Ultimate Relay Card Jumpers - Band Pass (BP)[edit]

  • To switch Band Pass (BP) filters, use the jumper configuration shown below

Jumpers-BPF.gif

Ultimate Relay Card Connectors[edit]

SWITCHED FILTER Conns.PNG

  1. +5V
  2. B5
  3. B3
  4. B4
  5. B1
  6. B2
  7. GND
  8. RFIn
  9. GND
  10. RFOut

Connectors[edit]

J1 - Input Connector[edit]

RELAY DRVR J1.PNG

  1. N/C
  2. IN1
  3. IN2
  4. IN3
  5. IN4
  6. IN5
  7. IN6
  8. GND

J2 - Output Connector[edit]

RELAY DRVR J2.PNG

  1. GND
  2. OUT6
  3. OUT5
  4. OUT4
  5. OUT3
  6. OUT2
  7. OUT1
  8. 5V OUT

Power Connector[edit]

  • 7-14V input
  • Center positive

Control via VFO-003[edit]

  • VFO-003
    • Band select via menu option
  • J8 - Arduino P5-P9
  • Arduino pins
  1. Arduino D5 - 10M select
  2. Arduino D6 - 15M select
  3. Arduino D7 - 20M select
  4. Arduino D8 - 40M select
  5. Arduino D9 - 80M select
  6. Vcc
  7. GND
  8. GND

VFO-003 J8.PNG

Cables[edit]

VFO-003 to Relay Driver Card[edit]

RLY_DRVR pin

1x8 BERG

Signal Function VFO-003_Pin

1x8 BERG

1 N/C N/C
2 IN1 10M 1
3 IN2 15M 2
4 IN3 20M 3
5 IN4 40M 4
6 IN5 80M 5
7 IN6 N/C
8 GND GND 7

Relay Driver to Relay Card[edit]

RLY pin

2x5 BERG

Signal Function RLY_DRVR pin

1x8 BERG

Signal
1 +5V Power 8 5V
2 B5 80M 3 OUT5
3 B3 20M 5 OUT3
4 B4 40M 4 OUT4
5 B1 10M 7 OUT1
6 B2 15M 6 OUT2
7 GND RF Gnd N/C GND
8 RFI RF In N/C
9 GND Power 1 GND
10 RFO N/C N/C
2 N/C

Testing[edit]

  • Apply 9-12V to DC jack
  • Use LED w/ resistor on output to check 5V
  • One channel at a time
    • Pull up channel input to +5V
    • Check output with LED pulled up to +5V out

CAD[edit]

RELAY-DRV CAD.PNG