Reply to "Whistle Waveform from Model ZW Transformer"

vrobertsOGR Forum Member

Thank you, @SteveH, @gunrunnerjohn and @PLCprof. This is all very useful information. I measured the resistance between A and U when the whistle switch was activated and that should give me the value of the resistor. It was well over 100 Ohms. (Or I may be misunderstanding the functioning of the Whistle/Direction switch.)

So, I increased the value of the resistor to 100 Ohms in my simulation and that produced the expected offset sinewave. Clearly very different than my measured waveforms. So, I believe I have an issue with the ZW that I must resolve before I put it up for sale.

At a minimum I will read the thread on replacing the old rectifier with a modern silicon diode, and then make that replacement.

I've attached a copy of my whistle circuit simulation for the A circuit, if you are into such things. As I said, I may have misunderstood how the Whistle/Direction switch works.

Thanks again!

Attachments

Hide

Files (1)

Lionel Whistle Circuit Simumation.pdf

1/22/225:49 PM

<ul id="{%=id%}ButtonGroup" class="button-group h-popup-buttons even-button-group even-1">
    <li id="{%=id%}Okay_buttonContainer"><a id="{%=id%}Okay" href="javascript:void(0);" class="button success no-margin-bottom h-alert-modal-ok-button" role="button">OK</a><script type="text/javascript">
        (function() {
            function {%=id%}Okay_click(event, data) {
            {%=id%}Popup.hide();
        }
        
                $('#{%=id%}Okay').on('click', {%=id%}Okay_click);
        })();
    </script></li></ul><a href="javascript:void(0);" class="close-reveal-modal" aria-label="Close Modal">&#215;</a><div class="last-modal-focus focus-utility-element" tabindex="0"></div>
</div>
<script type="text/javascript">
        (function() {
            {%=id%}Popup = new SS.Popup.ModalPopup('{%=id%}');
        })();
    </script>

Skip to main content

Attachments

Membership Required

Remove From Your Block List

Manage Follow Preferences

Block

OGR Forum Supporting Membership Required

OGR Forum Supporting Membership

Help support this forum with an OGR Forum Supporting Membership.You will be able to watch the videos in the INSTRUCTIONAL VIDEO FORUM!A one-year OGR Forum Supporting Membership is only $12 per year, so sign up now!

OR

Access the ALL the OGR VIDEO FORUMS AND over 300 back issues of OGRwith a DIGITAL SUBSCRIPTION!

Please wait...

Help support this forum with an OGR Forum Supporting Membership.
You will be able to watch the videos in the INSTRUCTIONAL VIDEO FORUM!
A one-year OGR Forum Supporting Membership is only $12 per year, so sign up now!

Access the ALL the OGR VIDEO FORUMS AND over 300 back issues of OGR
with a DIGITAL SUBSCRIPTION!