To view the DXKEY information correctly it is advisable to download the PDF version of this.
Circuit diagram of the DXKEY with clear memory (CLR MEM) jumper

...Parts List...
R1...........680
R2...........2K2
R3............68
R4-R8........10K
C1,C4,C5...100nF
C2,C3...100uF35V
C6..........22pF
D1........1N4007
D2........1N4148
T1.........BC337
BAT1..3.6V NI-MH
JUMPER......2PIN
ST1.......LM7805
U1.........DXKEY
POT.........10KA
LEDA-K.......LED
BT1-BT2...Key NA
DAHDIT.Iambic KEY

N.B. The Jumper CLR MEM
to disconnect the battery is
included in the circuit.
 This enables the chip to be reset
 back to its default condition.

DXKEY Component Layout

DXKEY can be assembled and tested in 30 minutes

Photo not to scale. PCB measures 6.0 x 4.5 cm. (2.36 x 1.77 inches)
PCB Layout

This view is not to scale. please use the PDF for correct sizing

Example of BT1/BT2 keypad construction for access to special functions

This special function keypad is operated easily with the index finger and thumb of the free hand. It is remote from the keyer and enables you to operate and even tune the TCVR simultaneously.

 

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