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Topic: Controlling two cold cathodes - is this possible? (Read 2 times) previous topic - next topic

RuggedCircuits

If you use an electromechanical relay make sure you order a diode too to put across the coil:

http://www.arduino.cc/playground/uploads/Learning/relays.pdf

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virtuoosi

Google found this sheet
http://octopart.com/34.81.7.005.9024-finder-5416032
which says it's an SSR after all.

So I just got to order the SSR?

RuggedCircuits

Click on the link at the center-top of the page you found that says "datasheet"  :)   The datasheet (always more trustworthy than what the distributor says) says it's electromechanical.

Diodes are cheap, buy some anyways. You can use them for Christmas decorations if nothing else.

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punk

from page 3 of data sheet - see also p.2 (graphics broken, naturally )

Ordering information
Electromechanical relay (EMR)
Example: 34 series slim electromechanical relay, 1 CO (SPDT) 6 A contacts, 24 V sensitive DC coil.
                                                                               A      B        C    D
                                                                                      0        1    0
                 3 4 . 5                1 . 7 . 0 2 4 . 0
                                                                A: Contact material                 D: Special versions
Series
                                                                0 = Standard AgNi                   0 = Flux proof (RT II)
Type
                                                                4 = AgSnO2                          9 = Flat version
5 = Electromechanical type
                                                                5 = AgNi + Au (5 [ch956]m)                C: Options
No. of poles
                                                                                                    1 = None
                                                                B: Contact circuit
1 = 1 pole, 6 A
                                                                0 = CO (SPDT)
Coil version                                                    3 = NO (SPST)
7 = Sensitive DC
Coil voltage
See coil specifications
Selecting features and options: only combinations in the same row are possible.
Preferred selections for best avaliability are shown in bold.
  Type     Coil version   A           B           C           D
  34.51    sens. DC       0-4-5       0-3         1           0
  34.51    sens. DC       0-4-5       0           1           9
Solid state relay (SSR)
Example: 34 series SSR relay, 2 A output, 24 V DC supply.
                3 4 . 8                 1 . 7 . 0 2 4 . 9 0 2 4
                                                                                    Output circuit
Series
                                                                                    9024 = 2 A - 24 V DC
Type
                                                                                    7048 = 0.1 A - 48 V DC
8 = SSR type
                                                                                    8240 = 2 A - 240 V AC
Output
1 = 1 NO (SPST-NO)
Input circuit
See input specifications

deSilva

#19
Sep 12, 2010, 11:21 pm Last Edit: Sep 12, 2010, 11:23 pm by mpeuser Reason: 1
There is little consistency in all those information.

The price of $19 horrible. But high end SSR go for that. A medium current electro-mechanical relay would be around $5...

A MOSFET is < $1.

Indeed, I lost the rationale behind this thread in the meantime...

punk

inconsintency?
Finder part number "34.81.7.005.9024" is SSR
34.51.whatever is electromechanical
in case it is not clear to someone.
The finnish site link is to an SSR

i'd go to discrete too, for what it matters

virtuoosi

Quote
Finder part number "34.81.7.005.9024" is SSR


It clearly said SSR when I ordered it, so that's what I am expecting. If get the wrong part I am going to return it obviously.

virtuoosi

I just got a mail from Partco, telling that they don't have the relay I ordered. There was some kind of error in their indexing. Anyways I'm trying to find yet another fitting SSR/EMR for my project. Now im looking into small relays. This one seems fitting, what do you guys think?
http://www.partco.biz/verkkokauppa/product_info.php?cPath=2065_1052_1730&products_id=7450

deSilva

Look for a Reed Relay with integrated diode, if 1A switched current is enough for your application.

All other things require some experience...
E.g.
Quote
5VDC 165[ch937]

You do know what that means?

virtuoosi

#24
Sep 13, 2010, 01:32 pm Last Edit: Sep 13, 2010, 01:44 pm by virtuoosi Reason: 1
Quote
You do know what that means?


5VDC is the required activating input voltage. Eg. the output of my Arduino board.

1A 24VDC is the voltage/current the relay will control. The voltage I'm trying to control is actually 12VDC, but that's not a problem, right?

1A is enough. The current is somewhere around 800mA.

EDIT: I found a 1A 5VDC reed relay with diode. Also read about the working principles of a reed relay. I think I got it now.

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