help only 1 min..its a easy task if you now

[TKS]

Hi,

following situation:

- Pic controller
- 12V DC relais, 230Ohm

1 7812
1 7805

how can i switch the relais on using the output pin of a pic???
i thought it could be done with a transistor??

some one suggestions?? i already have the follwing stuff:
- BC547C trans.
- UCC27322P, 9A mosfet pdip version Texas Instru..

please give a suggestion.

TKS

 

[Oznog]

PIC's output is 5V at most, and you need 12V to switch the relay coil. So you will need a transistor, you'll hook one side of the coil to 12V and the other to a transistor which will ground the other side when on. So you'll need an N-channel MOSFET or an npn bipolar with an emitter resistor.

The UCC27322P is a driver for a MOSFET gate, but the PIC pin can drive a gate on its own with no problems unless you've got a "special needs" application. I don't know what a BC547C is.

Regardless of which transistor you use, you must put a diode across the coil because it kicks out a high voltage surge when turned off.

You might also be able to switch the load directly with a transistor (no relay), depending on what you need to do.

 

[Nigel Goodwin]

Have a look at my tutorials, the 'Hardware Extras' shows how to do this.

 

[sardineta]

Here I have a circuit, that's the same as Nigel told you

 

[TKS]

this rocks...

it really rocks...

this is quit enjoyfull!

i always liked electronics but after some time (desoldering etc..)

i now have all the **** hooked up right!

i love it when a plan comes together

thanxs allot guys

TKS