Re: analog to ttl

On Wed, 06 Jul 2005 17:18:31 GMT, "Mook Johnson" <mook@xxxxxxxx>
wrote:

>"John Fields" <jfields@xxxxxxxxxxxxxxxxxxxxx> wrote in message
>news:64hnc15fnbahrmlf8lop7j0g7cvf2glqv4@xxxxxxxxxx
>> On Wed, 06 Jul 2005 02:17:26 GMT, "dimention11"
>> <dimention11@xxxxxxxxxxx> wrote:
>>
>>>
>>>"John Popelish" <jpopelish@xxxxxxxx> wrote in message
>>>news:j72dnfJ7ZIMqqVbfRVn-uw@xxxxxxxxxxxxxxx
>>>> dimention11 wrote:
>>>>> hello i have an analog 0-5v i wish to change to a digital (ttl) 0-5v.
>>>>> I assume it is as simple as hooking up a transistor.
>>>>> am i right...
>>>>
>>>> Might be. At exactly at what input voltage do you want the TTL output
>>>> to
>>>> change from low to high. Then, at exactly what input voltage do you
>>>> want
>>>> the output to transition back from high to low?
>>>
>>>I will want this to switch from approx 2v to on(5v)
>>>if this can be adjusted it would be even better.
>>
>> ---
>> Try this: (View in a non-proportional font like Courier)
>>
>> +5V>-------+---------+--------+
>> | | |
>> | | [1k]
>> | | |
>> | +---|-[100K]-+
>> | | | |
>> VIN>--[1K]-------+--|+\ |
>> | | >------+-->VOUT
>> [10k]<--+--|-/ LM393
>> | | |
>> | | |
>> GND>-------+-----+---+----------->GND
>>
>>
>> Adjust the switching voltage with the 10k pot and be sure to ground
>> the inputs and the output of the other comparator.
>>

>looks good but omit the connection from vin- to ground.

---
What are you talking about?

And please bottom post. It makes it much easier to follow a
discussion.

--
John Fields
Professional Circuit Designer
.

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