K 8055 and external DC voltage supply

Kits PC Related Projects
1

Hello

I connected an external 12V DC adapter as shown under point 22 in the assembly manual:

  • on GND
  • on CLAMP

Some days ago I tested with a 12VDC relay on Channel 7 and a 12V led on one of the other channels and it was perfectly working.

Today I wanted to test again, but it is not working, although the channels open and close (well the onboard-leds do) but neither the now connected 2 relays nor the external 12V leds are working.

All of them are connected to GND with one pole and to different Channels and the other pole.

I already changed the IC4 - CHip but also with the new one it is not working?

How can I find the problem?

Kind regards
Miguel

2

[quote]All of them are connected to GND with one pole and to different Channels and the other pole.[/quote]The relay and the LED (with series resistor) must be connected between CLAMP and the digital output of the card.

Here is an example of the connection:

799×410

3

… as it says in the connection scheme as well, but I was too blind to see the most obvious … now its working again, thanks a lot for quick reply.