December 14, 2020: Back in stock - thanks for waiting
NEW (07/20/2019) - SMT Keyall Discrete - a high voltage keying interface kit using surface mount technology
Need other parts to complete your kit ? Please see the: switch and parts page
The SMT 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 500V and 2A.
The SMT 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.
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: $14 plus postage/handling
printed documents are NOT included, please print/view your own from the pdf files provided
The SMT Keyall Discrete is a surface mount version of the Keyall Discrete kit
Download(right click - save target as) the manual ,
to view or print your own.
Print out a Kit order form to figure your order manually
Inquire via email with any questions / comments.