Re: encoder 12V --> 5V

You could probably find a purpose build part to do this : try
www.fairchildsemi.com or www.ti.com. You will have to do some
searching around (I'd give you a link otherwise). What you are
looking for is TTL compatible buffer with an input that tolerates 12V.

Another approach is to simply divide down the voltage and go directly
into your ttl level input. Assuming you have 12V and want to get to
5V wou would do something like this :

12Vsig ----> Resistor 1.4kOhm ----> TTL input ---> Resistor 1kOhm ---

> Ground.

Be sure that the output of your 12V signal can handle a 5mA load.
This approach is called a voltage divider. To get the division ratio
you divide the bottom resistor (1k in this case by the bottom
resisitor + the top resistor = 1 + 1.4 = 2.4k So for this Vout = Vin
* (1k/(1k +1.4k).

Hope that helps. These exact value will work for 12V.

PS use 1/4W resistors as the power is around 1/8 of a watt, or use
14k and 10k.

-Erik Reikes

--- In CAD_CAM_EDM_DRO@y..., "Frank de Beer" <f.debeer@w...> wrote:
> Oops,forgot to change the subject line
>
>
> List,
>
> I have several servomotors with Baumer encoders. The output level
of the
> encoder is 12-30 V (depends on what they get).
> What is the best way to make the output TTL compatible?
>
> regards,
>
> Frank