K2633 - modification to use with 12v supply and input

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1

:?: Please can you advise what changes you recommend for running this kit on 12v instead of 9v.

Can I just replace R1, R2, R3 & R4 with 100ohm resistors, or do I need to modify R5, R6, R7 and R8 as well.

Thanks

2

R1…R4 = 150 ohm would be a better value for 12VDC operation
For best results, chance R5…R8 to e.g. 1K

3

Hello!

The topic of the thread is …12V supply and input.
I would also use the K2633 with a 12V supply and switch the relays with 12V at the input pins IN1…IN4. Is a resistor Rx required? Which maximum voltage is possible at the pins IN1…IN4 without any modification?

Kind regards

4

Rx is always required.
Please note that the relays are energized when the input is tied to ground (see K2633 diagram).
Max. input unmodified: 9VDC

5

I successfully modified this board to 12v operation by modding R1…R4 to 150 ohm and R5…R8 1K

I don’t recall the value I used for Rx, But for sure you can’t omit it. What is your input?