Mystery Box in Engine Room

[jim rosenthal]

Right, and the transformer only works on AC, right?

 

[SEVEN]

It’s definitely a Flux Capacitor.

 

[Pascal]

No manuals or diagrams on board?

Lazzara also used 120V AC to 24V AC transformers for lights (at least around 2009) with automatic relays to switch some of them to 24V DC from the batteries when AC power would be disconnected.

Could this be something similar with a manual override

When I buy LED bulbs I have to make sure they are 24V AC/DC but many are nowadays

 

[Reefgeorge]

Right, and the transformer only works on AC, right?

That's right Jim. The operation of the transformer depends on the constantly building and collapsing fields created by AC in the primary windings to induce a voltage in the secondary (output) windings. Since I'm getting all nerdy this morning: the voltage is induced in the secondary windings during this constantly building and collapsing of the magnetic field around the primary windings by a process called mutual inductance and the resulting output voltage is in direct proportion to the ratio of the primary and secondary windings. 10:1 ratio and the output is 12VAC.

Opps sorry, short answer: yes.

Hmmm, not sure if a flux capacitor works with DC or not? :-/

George

 

[JLR]

Looks like it was used to feed outlets under the cover boards for electric reels.

 

[Cricket]

That's a crazy way to power a deep drop or dredge reel.

 

[rsmith]

That's a crazy way to power a deep drop or dredge reel.

Probably not a bad idea if it can handle the load. I’ve pulled my 12v 8d generator starting batteries down after multiple 800’ drops with the big Kristals pulling grouper.

 

[Cricket]

John's little boxes didn't look very hearty to produce a ton of amps, and being sealed how was the heat going to escape from all of the hard work the transformers were doing.
Wonder if those were an Ocean Yacht add on or previous owner invention? Kind of reminds me of an outdoor lighting setup.

Scott, what's your opinion of the LP1200 reels compared to the Krystal's?
We're using 24volt Krystal's for deep drop and 24volt Miya's 15's for our dredges.
Just unwilling to buck up for what the LP's cost, and also since all the boats now have the LP's I'm a little anti.

 

[rsmith]

Lindgren-Pitman Has always been the commercial duty stuff. I like the digital counter and auto feature on the new reels. Looks like they kind of copied Miya epoc. Big bucks though 5-8k per reel. We’ve had no problems with the Kristals much better than the electra mate 12/0’s they replaced. Would be nice though to drop back to the exact same depth that your marking fish though. Most cases we drop to the bottom and come up best we can estimate where the fish are.

 

[Cricket]

Ran into what the high low switches are for, 24 volts low or 32 volts high.

https://www.ebay.com/itm/STAHLIN-12...322406?hash=item46a2fedce6:g:SwcAAOSwB05d0d-h

 

[tonytrakovich]

That's right Jim. The operation of the transformer depends on the constantly building and collapsing fields created by AC in the primary windings to induce a voltage in the secondary (output) windings. Since I'm getting all nerdy this morning: the voltage is induced in the secondary windings during this constantly building and collapsing of the magnetic field around the primary windings by a process called mutual inductance and the resulting output voltage is in direct proportion to the ratio of the primary and secondary windings. 10:1 ratio and the output is 12VAC.Opps sorry, short answer: yes.Hmmm, not sure if a flux capacitor works with DC or not? :-/George

In this case there a couple of bridge rectifiers converting the AC to DC.

 

[Reefgeorge]

Yes, you need rectifiers to get from AC to DC after the transformer steps down (in this case) the AC to a lower voltage. Depending on if the transformer has a center tap or not and if you want full wave or half wave rectification then you either need a bridge (4 diodes) or two discrete diodes. At that point you have (depending on what source you read) either rectified AC or unfiltered DC which is very noisy and does not develop full DC voltage potential. You add large filter capacitors after the bridge and then you have higher DC voltage with minimal ripple. Some electronics can operate with unfilterd DC/rectified AC but many circuits, especially in the modern era may not function correctly.

George