Re: neat Hall sensor

On Mon, 6 Jan 2025 17:45:11 +0100, Lasse Langwadt <llc@fonz.dk> wrote:

On 1/6/25 16:54, john larkin wrote:

On Mon, 06 Jan 2025 08:30:42 -0500, legg <legg@nospam.magma.ca> wrote:
 

On Sun, 05 Jan 2025 13:53:36 -0800, john larkin <jl@glen--canyon.com>
wrote:
>
<snip>

It's a nice part. We're using the 10 amp version at up to 7.5 amps.
The 50 amp version is silly.

>
Well, when you actually get around to using it (probably in a
relatively remote location) be sure to R/C the power and
data lines. R in series with source, C at receiving end.
>
RL

>
That Monolithic Hall sensor is analog output. Zero current outputs
Vcc/2, and the sensitivity is ratiometric on Vcc. So one uses the same
rail for sensor Vcc and for the ADC reference. We'll autozero it every
powerup.
>
I'll RC filter a bit, right at the ADC input. Most ADCs kick out some
charge when they sample, and that freaks out a lot of analog parts.
>
I'll have eight Hall sensors on a board, about like this one:
>
https://highlandtechnology.com/Product/P945
>

>
So, the sensors are very remote.
>
RL

>
No, surface-mount, on the board. Close to the ADCs.
>
>

Connector pins carry 8x 10A load current?
>
RL

 
I'm using 8 amp relays and rating things at 7.5 amps. We'll use
Phoenix connectors rated at 12 amps per pin.
 
The relays we have are DPDT, so we can put two contacts in series to
make a SPST closure and double the legal DC breaking voltage.
 
Here's what I have in mind:
 
https://www.dropbox.com/scl/fo/i7cpyb2t6zitll7ct2jok/ADuap85ok1QGUyRRAQzxk2o?rlkey=vdvw35y0ix9zbyt8mbok2t0hs&dl=0
 
My pcb design guy is underused lately so I figured I'd knock out a
couple of simple modules to keep us amused. But then feature-itus
kicked in. It could even be a polyphase power meter... maybe later.
 
The trick is to get the 2nd row of connectors onto the front panel.
I'm thinking a  baby board and ten 2-56 spacers to support it and
bring the connections up.

>
you can get dual row connectors,
https://nl.rs-online.com/web/p/pluggable-terminal-blocks/8817862
>
>

One problem with the Phoenix connectors is that they are big. Another
issue is that you need to be Superman to un-mate them. The 5-pin pair
that we use has ejectors so it's not so bad.