C.<p>Schematic: "2022 - We've updated the circuit design to use widely-available part AB1234DL rather than the impossible-to-find one the original design used!"</p><p><search Newark/RS/Element14></p><p>Website 2025: "AB1234DL: obsolete, not available to order"</p><p>Sigh.</p><p><a href="https://mindly.social/tags/electronics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>electronics</span></a> <a href="https://mindly.social/tags/hobby" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>hobby</span></a> <a href="https://mindly.social/tags/obsolete" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>obsolete</span></a> <a href="https://mindly.social/tags/obsolescent" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>obsolescent</span></a> <a href="https://mindly.social/tags/schematic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>schematic</span></a> <a href="https://mindly.social/tags/part" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>part</span></a> <a href="https://mindly.social/tags/component" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>component</span></a> <a href="https://mindly.social/tags/replacement" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>replacement</span></a> <a href="https://mindly.social/tags/substitute" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>substitute</span></a></p>