/members-area/b/blog/posts/traffic-signal-teardownFollow along as I poke and prod at a traffic signal! I may know someone who has an old US traffic light that needed a replacement Yellow and was surprised to find them readily available on eBay for only $10 (plus shipping). Of course I had to open ien-USTelligent Community 12https://community.element14.com/members-area/b/blog/posts/traffic-signal-teardownFri, 04 Feb 2022 18:55:23 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:7677f5d2-1066-4cfb-b862-8fd9bc708e3dscottiebabe1<p>If I had to take a wild guess, I would say the switched load is to provided a decisive turnoff when the input power is removed. Otherwise the led array would slowly bleed down the output capacitors.&nbsp;</p><img src="https://community.element14.com/aggbug?PostID=22975&AppID=75&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/b/blog/posts/traffic-signal-teardownFri, 04 Feb 2022 17:29:25 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:7677f5d2-1066-4cfb-b862-8fd9bc708e3daspork420<p>Also - if anyone knows a safe way I can probe this with an oscilloscope, let me know. It is mains powered and doesn&#39;t have an isolation transformer. I don&#39;t own a differential probe.</p><img src="https://community.element14.com/aggbug?PostID=22975&AppID=75&AppType=Weblog&ContentType=0" width="1" height="1">