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The Keyall HV kit
March 28, 2015 - NEW

September 28, 2017: all versions are in stock, thanks for waiting

Keyall HV options

[Assembled Keyall HV circuit board picture - click for larger view of board ] The Keyall HV 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 1000 V and 3.1 A (3100 mA).

The Keyall HV kit is an update of the original Keyall kit.

Also note that the board plating appears corroded, however it should not affect soldering.
Suggestion from a customer: use a brass brush to shine up the bottom traces before soldering.

The Keyall HV will normally key a single transmitter.

11/03/2015: NEW - a $14.00 version of the Keyall HV is now being offered with 500 volt (IRF820) transistors instead of the stock 1000 volt transistors (IRFBG30).

September 30, 2017: A customer has encountered keying problems with a Heathkit DX-40 (cathode keyed rig), the problem was solved by removing R2, the 100k ohm resistor. This may lengthen the key down slightly (3 milliseconds?) - it's probably only needed IF the Keyall HV is used at higher current levels (175 mA and above ?). The customer reported that the DX-40 keying sounded OK on a shack receiver. Another option may be to increase the value of R2 above 100k ohms to 150k or above.

  • 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 holder
  • Size is 1.25 x 1.5 inches - fits into a candy tin with room to spare
  • Price (no printed documentation) is $15.50 + shipping/handling
  • add another $1.00 for a 6 pin socket for the PVI
  • Printed manuals available for an additional charge or save money by downloading (Right click/save target as) and printing the manual , schematic and hookup diagram.

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    Keyall HV options
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    Downloadable files for the Keyall HV kit

    The Acrobat files of complex diagrams (like the schematic) may not view well on your computer screen - suggestion: use the magnifier to zoom in for better detail or print out the file.

    keyallhv.pdf (54k) - an Acrobat file of the Keyall HV schematic

    keyallhvm.pdf (9k) - an Acrobat file of the Keyall HV manual

    keyallhvhu.pdf (38k) - an Acrobat file of the Keyall HV hookup diagram

    5msperdiv.JPG (1.1 Mb) - a JPG of the Keyall HV test fixture prototype rise/fall times

    The top trace is the Keyall HV output
    The bottom trace is the keyer input
    The graduations are 5 mS per division horizontally and 1 volt vertically.
    keyer speed is over 60 wpm

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