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From: "Don" <g@crcomp.net>
Newsgroups: sci.electronics.design
Subject: Re: silly circuit
Date: Wed, 8 Apr 2026 15:51:12 -0000 (UTC)
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piglet wrote:

<snip>

> To light LEDs you can probably do without ICs or even capacitors, here
> is an almost-two-terminal very cheap and dirty switcher idea ...
>
> <https://www.dropbox.com/scl/fi/4w3k0rvr5g7up8occfsjj/Buck_Hysteretic.jpeg?rlkey=bb2nlbzyzprxrzegb9wfddem4&st=n3btk1il&raw=1>

Thank you for sharing. The cheap LD24AJTA [1] constant current driver
is powered by a ?popular? PT4115 [2] IC deployed in the style of a buck
converter.

Allow me to transition this topic to 120 VAC LED COB filaments. This
picture shows such specimens, with the topmost powered-on and the
bottommost powered-off:

  <https://crcomp.net/led/accob.png>

The protoboard's black wire connects to 120 ACV Line while its white
wire connects to Neutral. My goal is to discover the silicon secrets
in such a simple filament.

Note:

[1] <https://eletechsup.com/products/ld24ajta-5000-1-dimming-dc-6-24v-22w-adjustable-constant-current-step-down-high-brightnes>
[2] <https://static.chipdip.ru/lib/848/DOC018848756.pdf>

-- 
73, Don, KB7RPU                                           veritas    _|_
                                                          liberabit   |
https://www.qsl.net/kb7rpu                                vos         |