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From: Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>
Newsgroups: sci.electronics.design
Subject: Re: Replacing mechanical Latching Relays with dual coil relays...
Date: Tue, 27 Aug 2024 14:07:25 -0000 (UTC)
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Jasen Betts <usenet@revmaps.no-ip.org> wrote:
> On 2024-08-27, Liz Tuddenham <liz@poppyrecords.invalid.invalid> wrote:
>> John Robertson <jrr@flippers.com> wrote:
>> 
>>> Anyone have experience with dual coil latching relays? I'm trying to 
>>> replace old (1950s) Guardian latch relays as used in 1950s style 
>>> jukeboxes with more modern two coil latching relays but have had trouble
>>> with some relays going to an indeterminate state if the power to the 
>>> coil is  below optimum.
>>> 
>>> What I actually need to do is a circuit that only allows the Latch/Reset
>>> coils to trip when there is sufficient voltage and current available...
>>> 
>>> This somewhat plays into the discussion on DC relay latching voltage 
>>> thread and I'm wondering if the Zener diode across the windings or in
>>> series with the windings might help my design.
>>> 
>>> As for the old original relays, the contacts are getting so pitted they
>>> can't be saved and Guardian hasn't made this coil assy for decades. They
>>> don't turn up on eBay either.
>> 
>> Two opposed solenoids and an arm on the spindle of a rotary switch.
> 
> Or on an bank of opposed microswitches.  I've seen that done except
> the solenoide were a telephone ringer hammer driver.
> 

The rated lifetime of your average switch is a small fraction of your
average relay’s, even if you don’t abuse it like that. 

Some microswitches are better, but still not the 1E7 of a good relay iirc. 

Cheers 

Phil Hobbs 

-- 
Dr Philip C D Hobbs  Principal Consultant  ElectroOptical Innovations LLC /
Hobbs ElectroOptics  Optics, Electro-optics, Photonics, Analog Electronics