Ham Radio KITS - TOP PAGE - Washington Island BOOKS

Keyer Accessory kit - revived/improved 5/28/2019

March 28, 2023: SSR is now $7 due to parts price increases, see Kit order form for pricing

March 4, 2022: a Schottky diode will now be included with the kit at no extra charge,
please connect the banded end to +VI or +Vin on the board and the other end to the battery connector positive terminal
Download(right click - save target as) the the mod doc


05/21/2020: put a PK-4 demo video on Youtube which features the PICPADL and the Keyer Accessory kit.

Click picture for a larger view:
[keyer accessory circuit board picture - click for larger version]
The keyer accessory kit is a circuit board with a low power voltage regulator AND a high voltage keying circuit, similar to the Keyall HV, which is the perfect addition to any keyer or circuit that doesn't have a voltage regulator or a high voltage (for cathode or grid block tube rigs) keying output. The Solid State Relay is rated at 120 mA and 400 V. Some cathode keyed rigs such as the Knight T-150 may require the Keyall HV due to larger than 120 mA currents. If in doubt, measure the current and voltage with your rig.

  • kit available with or without the SSR (solid state relay)
  • choice of three differnt voltage regulators:
  • The LM2936 is a virtually bulletproof 5 volt regulator with a standby current of about 7 uA.
  • The Seiko S812C30 is a 3 volt regulator with a standby current of about 1 uA.
  • The Seiko S812C50 is a 5 volt regulator with a standby current of about 1 uA.
  • The circuit board is about 0.9 by 0.7 inches and has one mounting hole sized for 4-40 hardware (1/8 inch)
  • LED makes it easy to monitor current usage, indicates when the keyer is sleeping
  • printed documents are NOT included, please print/view your own from the pdf files provided
    • Download(right click - save target as) the the mod doc
    Download(right click - save target as) the manual , and schematic to view or print your own.

    Print out a Kit order form to figure your order manually
    or try our: javascript order form to let your browser do the math!


    original 2005-2007 Keyer Accessory kit docs: manual and diagram both in Adobe Acrobat (.pdf) format.
    original 2005-2007 kit picture

    For any questions, please send an email to me, Chuck Olson, WB9KZY at:



    with your question.

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