/members-area/personalblogs/b/john-wiltrout-s-blog/posts/mystery-part-from-the-1970sWhile digging through my stores of old and obsolete parts I came across this 3.5 X 2.5 X 1.25 cm black box with 4 leads and no markings. I can remember it being in my stock of parts back in the late 1960s and early 1970s when I was repairi...en-USTelligent Community 12https://community.element14.com/members-area/personalblogs/b/john-wiltrout-s-blog/posts/mystery-part-from-the-1970sFri, 07 Oct 2016 18:42:17 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:ddc60d24-a384-475e-ba23-316cbebb9268DAB0<p>I remember seeing those things in circuits, but my memory is no longer able to put a name on it.</p><p>&nbsp;</p><p>From the size, I would think that it was built as some type of power switch or controller.</p><p>&nbsp;</p><p>Definitely an interesting puzzle.</p><p>&nbsp;</p><p>DAB</p><img src="https://community.element14.com/aggbug?PostID=2094&AppID=315&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/john-wiltrout-s-blog/posts/mystery-part-from-the-1970sFri, 07 Oct 2016 17:01:38 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:ddc60d24-a384-475e-ba23-316cbebb9268Jan Cumps1<p>If you don&#39;t have plans for the component, you could maybe try to open the enclosure?</p><img src="https://community.element14.com/aggbug?PostID=2094&AppID=315&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/john-wiltrout-s-blog/posts/mystery-part-from-the-1970sFri, 07 Oct 2016 16:25:15 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:ddc60d24-a384-475e-ba23-316cbebb9268D_Hersey1<p>Looks awful big.&nbsp; Could it be a SSR?</p><img src="https://community.element14.com/aggbug?PostID=2094&AppID=315&AppType=Weblog&ContentType=0" width="1" height="1">