On Saturday 30 November 2024 01:36:13 am SheldonD via groups.io wrote:
Been playing with various chinese-originated latching relay solutions from Amazon. Most are 'overly optimistic' about capabilities. Very 'overly optimistic'. Otherwise the rest have issues operating in environment with heavy canbus, Bluetooth, pwm alternator, 2M xceiver, and brushed engine / HVAC fans.
Reaching way back in my mind, I seem to remember JK flip flops toggling output when strobed if J&K are tied high. Maybe it wasn't JK, but another type? Important points being that outputs are low upon turn on, and stroking with momentary (debounced) switch (high input).
That'll work, also a Type D FF, if you tie the D input to the Not-Q output. Whether high input will trigger it or not depends on the part, they can work either way, check the datasheet (have a look at rtellason.com/ic-generic).
I am thinking that can tie outputs to darlington driver array, like ULN2803 or similar. Up to 1/2A current, 50vdc max, designed for inductive loads. Haven't found any information on temperature control yet.
Not sure if I am reinventing the wheel. I do know that relays / contractors that utilize magnets for latch hold are probitive physically and way overkill.
Yeah. Just adding a bit of electronics is way cheaper/simpler overall.
Incidentally, relay outputs will be controlling multiple isolated power supplies. Need around 16ch of mixed outputs.
Suggestions or alternatives if I am on wrong path?
Tomorrow I will be trying to find 32/64 bit versions of LTSpice (or similar) as my 486DX4 based PC (500MB drive and 8MB Ram!) 16/32bit machine died during Hurricane Beryl.
Stuff like that oughta be easy to find, and dirt cheap. Most of that vintage stuff like that that I had is in boxes out in the garage, destined for the recycler. I was actually using a 386 box for a router/firewall, but found that a dedicated router was a *lot* faster in terms of throughput, and that on a DSL line!
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
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Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
