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Our Club is planning a new layout and I have been tasked with the electrical. I am seeing that for us running the TIU in Passive mode will be beneficial but I just wanted to check do I need the 22uh choke from the TIU going the power bus or in the power bus either before or after where the TIU ties in? I did see the one diagram above as the choke before the TIU in the bus on the AC Hot line. I just want to make sure this will be the correct placement. 

@zhubl posted:

Our Club is planning a new layout and I have been tasked with the electrical. I am seeing that for us running the TIU in Passive mode will be beneficial but I just wanted to check do I need the 22uh choke from the TIU going the power bus or in the power bus either before or after where the TIU ties in? I did see the one diagram above as the choke before the TIU in the bus on the AC Hot line. I just want to make sure this will be the correct placement. 

If you're running passive mode, the choke should be in series with any transformer output.  Obviously, you would put it near the transformer, not on each drop to the track.  So, if you have four bricks feeding the layout, for example, you'd need four full current capacity 22uh (or higher value) chokes, one for each transformer feed.

Here's a couple good choices that will do the job, both exceed the current and impedance rating needed.

Signal Transformer HCTI-33-11-7

Signal Transformer HCTI-27-15-6

I'd probably be tempted to put a TVS diode between the choke and the track as well.  Here's what I use.

 1500W 33.3V TVS at Digikey

@zhubl posted:

Our Club is planning a new layout and I have been tasked with the electrical. I am seeing that for us running the TIU in Passive mode will be beneficial but I just wanted to check do I need the 22uh choke from the TIU going the power bus or in the power bus either before or after where the TIU ties in? I did see the one diagram above as the choke before the TIU in the bus on the AC Hot line. I just want to make sure this will be the correct placement. 

You might also want to think about putting a PSX on each transformer output.  We have about 15 of them installed and have had very good results.  We have them in the auto-reset mode.  Works like a charm and our incidence of blown engines is WAY down.  

I talked to Tony's Train Exchange this morning who is the company that sells and distributes the PSX-AC.  They indicated they have plenty PSX-ACs in stock and there is no intention of discontinuing the product. 

Sorry GRJ, we will use your ''Expertise' on another project.

Everyone stay safe & well

Bob D

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