Automotive delay relay

[setare]

I would like to make an automotive delay relay circuit by 555, but by
turn on/off another relay near this circuit the delay time changes, I
used regulator, inductor and RC filter for input supply but
unfortunately the problem not solved,Iwill be glad if suggest me an
application solution.

 

[PeteS]

Unfortunately, your description is as clear as mud.

If you would describe your desired application more precisely, we may
be able to help.

Cheers

PeteS

 

[Figaro]

"setare" <anooshe244@yahoo.co.uk> wrote in message
news:1124004125.062981.83820@g47g2000cwa.googlegroups.com...
|I would like to make an automotive delay relay circuit by 555, but by
| turn on/off ANOTHER RELAY near this circuit the delay time changes, I
| used regulator, inductor and RC filter for input supply but
| unfortunately the problem not solved,Iwill be glad if suggest me an
| application solution.
|
It seems that spikes/noise from that other relay (when it operates) is
causing your 555 to misoperate. Perhaps, a reverse diode and/or capacitor
across its coil might sufficiently reduce spikes/noise that affect the 555.
For example, see http://relays.tycoelectronics.com/app_pdfs/13c3311.pdf

 

[John Fields]

On 14 Aug 2005 00:22:05 -0700, "setare" <anooshe244@yahoo.co.uk>
wrote:

I would like to make an automotive delay relay circuit by 555, but by
turn on/off another relay near this circuit the delay time changes, I
used regulator, inductor and RC filter for input supply but
unfortunately the problem not solved,Iwill be glad if suggest me an
application solution.

---
You haven't said how you're triggering the 555, so I didn't show
anything about that,but try this for the power supply:


78L05
+-------+
+12V>----+---[1N4002>]--+--------+------|IN OUT|---+--+5V
|K |K |+ | GND | |
[1N4002] [1N5355] [1000ľF] +---+---+ [0.1]
| | |25V | |
GND>-----+-+------------+--------+----+-----+-------+
| |
| 7555 |
| +--------+ |
+---|GND | |
| | | E
[0.1] | OUT|---[150]---B 2N4401
| | | C
+5V--+---|Vcc | |
+--------+ +---------+
| |
[IN4001] [COIL]- - |
|K | O--> |<--O--NC
+---------+ | |
| | O------COM
+12V |
+-----------NO

Also, I showed a CMOS 555, but a bipolar should work just as well,
and you can use any transistor (or logic-level MOSFET) which can
drive the relay. Keep the wiring short and the capacitors as close
to the IC packages as you can.



--
John Fields
Professional Circuit Designer

 

[Terry]

On Sun, 14 Aug 2005 10:58:32 -0500, John Fields
<jfields@austininstruments.com> wrote:

........ try this for the power supply:

....snip...

Now that's what I call bulletproof! Betcha can't even hear the 'clik!'

Cheers--
Terry--WB4FXD
Edenton, NC

 

[ehsjr]

Terry wrote:

On Sun, 14 Aug 2005 10:58:32 -0500, John Fields
jfields@austininstruments.com> wrote:

....... try this for the power supply:

...snip...

Now that's what I call bulletproof! Betcha can't even hear the 'clik!'

Cheers--
Terry--WB4FXD
Edenton, NC

And for his work, will he even get a thank you from the op?
It would be refreshing. Too often, the op disappears, and we
never learn how he/she made out. And too often, somone posts
a nice solution and doesn't get any appreciation from the poster.
Grumble.

Ed