Can anyone define JD in the JD-VCC you see on some relay boards?

I know it means the power supply for one side of the relay, but I'm curious about what the initials 'JD' stand for, and does JD-VCC only apply to relays?

JD-Vcc terminal supplies power for the relay coils.

Vcc supplies power for the optocoupler.


JD ? Probably from Asian spelling problems . . .

larryd:
JD ? Probably from Asian spelling problems . . .

Yeah. Can't say it makes any sense to me. :roll_eyes:

I think of JD-VCC as Jumper Driver to VCC (relay driver), but the PCB designer probably just meant Jumper Diodes to VCC (flyback diodes).

Juvenile Delinquent back in the day ;).