arm_20to10

20-pin to 10-pin ARM JTAG/SWD adapter, with toggle-able 3.3v LDO to power the target (jlink can output 5.0v on pin 19 of the arm 20-pin connector).

pcb render

. . . . . .

assembly render

assembled unit

parts

10 pin through hole male connector

digikey
mouser
ebay

shrouded, digikey

20 pin through hole female connector

digikey
ebay
digkey right angle

3.3v ldo

mouser- skyworks sot23-5
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digikey- TI sot23-5
digikey- Micrel sot23-5 300mA

beefier ldo

mouser- ON
mouser- diodes

slide switch

mouser- C&K
digikey- Copal
mouser- ALPS