[MAMS] relay driver

[Danny Pease]

There is a diagram on the case, it shows the coils in series and it shows
the outside ends as positive. The part number is 401-320832. I even found a
bit of information about it on the web.

http://www.dowkey.com/product/0/rf_switches_relays_401_latching_401_320832.p
hp

If I can get by running the current through the coil all the time, it would
be much simpler.

Danny NG9R


-----Original Message-----
From: mams-bounces at mailman.qth.net [mailto:mams-bounces at mailman.qth.net] On
Behalf Of Dr. Gerald N. Johnson
Sent: Friday, September 07, 2012 3:17 PM
To: mams at mailman.qth.net
Subject: Re: [MAMS] relay driver

That's why its so critical to know the DowKey part number because the
different makers treat the connections differently. The first ones I looked
at in the DK catalog show the - pin is common to both coils and the
individual pins take + in the relays that take external pulse control. In
the relays that do their own cutoff, they just show a block for the logic,
and it has a - and + pin for each coil but doesn't hint whether they are
totally independent so you can switch one end of one coil and the other end
of the other coil or not.

73, Jerry, K0CQ

On 9/7/2012 2:32 PM, Zack Widup wrote:
> The HP33311C that I mentioned latches when one of the two pins marked "-"
> is grounded. That pin can then either remain grounded or opened up and 
> the relay will remain latched in that position until the other pin is
grounded.
> Then that pin can either remain grounded or opened up, etc.
>
> I have another latching SMA relay that is a little more complicated. I 
> haven't used it yet.
>
> 73, Zack W9SZ
>
>
> On Fri, Sep 7, 2012 at 1:29 PM, Dr. Gerald N. Johnson
> <geraldj at weather.net>wrote:
>
>> There are at least a couple two coil latching relay schemes. One is 
>> just two coils tha you only need to apply a pulse to for a short 
>> period and the relay mechanically or magnetically latches. I don't 
>> see a restriction in the catalog that requires power be removed from 
>> the coil right away except that the current of some latching versions 
>> at 12 volts is 230 ma and the same relay not latching (fail safe) is 
>> 195 ma, so there's more heat in the relay with continuous coil power. 
>> Then, of course, it takes applying power to the other coil to change 
>> the relay position. Coils often have one wire in common and are 
>> polarity sensitive so that prevents some simple drive circuits based 
>> on conventional relay drive.
>>
>> Some Dow-Key also have a self cutoff circuit, so keep the power 
>> consumption low by taking care of interrupting the coil current on 
>> their own to make the drive circuit simpler.
>>
>> I have portions of a recent Dow-Key relay catalog on my other 
>> computer but need a model number to know what you have and how to drive
it.
>>
>> 73, Jerry, K0CQ
>>
>> On 9/7/2012 12:47 PM, Danny Pease wrote:
>>> I picked up a two coil 12 volt latching DowKey SMA relay and am 
>>> looking
>> for
>>> simple suggestions for using it or I would be glad to trade it for a 
>>> non latching SMA relay, 12 or 24 volt.
>>>
>>> Danny NG9R
>>>
>>>
>> _
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