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From: Joe G (Home) on 8 Jun 2010 06:50
Hi All,

I'd like to convert LOGIC (0,1) 24Vdc signals, <100mA, < 2kHz to 12Vdc
signals. Low power consumtion is not required. 24V and 12V sources
availabe

What can you suggest.

I was thinking the following primative ideas

a) Series resistor with 12V Zener shunt

b)
24V -- series resistor in to base of PNP transistor and open collector
with resistor pull down


Joe




From: Grant on 8 Jun 2010 07:44
On Tue, 8 Jun 2010 20:50:27 +1000, "Joe G \(Home\)" <joe.g(a)optusnet.com.au> wrote:

>Hi All,
>
>I'd like to convert LOGIC (0,1) 24Vdc signals, <100mA, < 2kHz to 12Vdc
>signals. Low power consumtion is not required. 24V and 12V sources
>availabe
>
>What can you suggest.
>
>I was thinking the following primative ideas
>
>a) Series resistor with 12V Zener shunt
>
>b)
>24V -- series resistor in to base of PNP transistor and open collector
>with resistor pull down

Depends what the signals are driving at 12V, where the 12V logic threshold
is.

c) Series resistor into 4000 series CMOS gate.

d) R plus R resistor divider

e) like b) but use an NPN.

Goes on and on until you define what's being switched at 12V, no?

Grant.
--
http://bugs.id.au/
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