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Keyall Discrete kit - January 27, 2019 - initial release

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[Keyall Discrete kit parts picture - 
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The Keyall Discrete kit allows the owner of a keyer with a low voltage positive (NPN or n-channel MOSFET) keying transistor to drive the vacuum tube transmitters and transceivers of yesteryear. This unit will key negative voltage rigs (grid block keying) or positive voltage rigs (cathode keyed tube transmitters and conventional +13.8V powered solid state rigs). The output transistors and capacitor are rated at 500 or 1000 V and 2.5 or 3.1 A (3100 mA). The Keyall Discrete will normally key a single transmitter. The use of the word: discrete refers to the fact that only LEDs, transistors, resistors and a capacitor are used in the kit, no ICs (Integrated Circuits) are used.

The Keyall Discrete is an update of the Keyall HV kit

  • design is a MOSFET based solid state relay, SPST-NO single pole, single throw, normally open
  • high voltage output is optically isolated from the low voltage input
  • kit includes a circuit board and all board mounted components
  • just add your enclosure, in/out jacks and a battery/power supply connector
  • board size: about 2 by 2 inches (50 x 50 mm)
  • pricing: $15.50 with 500V transistors, $17 with 1000V transistors plus postage/handling
  • printed documents are NOT included, please print/view your own from the pdf files provided

  • Download(right click - save target as) the manual , schematic , hookup and technical questions and answers 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!

    Youtube videos:

    K9LW provided this: video of his kit, Thanks Dick !
    K9LW also provided this: second video with the case opened
    Finally here is my video of the kit switching a 120VAC appliance lamp