Re: analog to ttl

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.


--
John Fields
Professional Circuit Designer
.

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