Relay

[Stu Lyon]

To further pursue this subject, look at the data sheet for the P&B K10 
relay:
110VDC coil 11,000 ohms 10 mA
120VAC coil  3,900 ohms  11 mA

ref: http://relays.tycoelectronics.com/datasheets/K10_DS.pdf

Since it's amp-turns that operate a relay, the 120VAC relay should draw 
the correct current at about 42VDC.  (3.9K *11mA)

Back where we started from, a suitable relay for Martin might be found 
from Mouser:
http://www.mouser.com/catalog/623/1238.pdf

Stu W6CUX

Allen Jones wrote:

>No expert on this stuff but found the following in the
>Collins Collectors Archive from 2002:
>
>"When an AC relay is used on AC the coil resistance
>and inductance set 
>the coil current.  When the same relay is used on DC
>the current will be 
>higher as the reactance will not have any current
>limiting effect.  If 
>this relay is operated for long periods, the coil will
>get really hot. 
> In amateur service where the on - off ratio is
>generally low the coil 
>will not be on long enough to matter.  If you are long
>winded or running 
>RTTY, put some additional resistance is series with
>the coil to get the 
>current back to the original value.  You will need to
>determine the AC 
>current either from data sheets for the relay or by
>measurement."
>
>I know from experience that a 12V AC relay run off of
>DC will get HOT if energized for several minutes at a
>time.
>
>My observation, your mileage may vary.
>
>73,
>
>Allen, W9DZ
>
>
>
>  
>

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