Re: Intermittent Problem with Circuit Design. Asking for Assistance.

"Derrick Tennant" <emrikol@xxxxxxxxx> wrote in message
news:1137080203.028635.231430@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Hello,
>
> I'm currently working on a project for work where we need to take in a
> -24VDC (+/-10%) voltage, and a -12/-24VDC (+/-10%) Oscilatting voltage
> and convert it to +5VDC for use in standard TTL chips. The kicker is
> that at -24VDC it needs to be converted to +5VCD, and at -12VCD, it
> needs to be at ground.

I don't understand where the fixed -24V is in your scheme.

But if it's what I think you mean, I'd just use a photocoupler.

+5V
|
.-.
| |
| | 2k2
'-'
-12v to -24v o------. |
| o------- OUT
V -> |/
Photocoupler
| |>
___ | |
-24v o---|___|------' |
2k2 ===
GND


If the fixed -24v line I showed doesn't exist, then you need to be more
clear about what you're working with.


.

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