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This module uses a very unexpected component to trigger a MOSFET for flashing 12V lights with just two wires.

I was actually quite pleased to see such a retro component is not just still available, but has made the transition to an SMD package.

https://youtu.be/aphdM0ttTJM

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This was such a pleasure to reverse engineer because of the unexpected hybrid circuitry that uses a very retro component to control a modern one. And bizarrely, the "retro" component is in a modern surface mount package. A search on Aliexpress found an SMD transistor called P27 which may be a modern variant of the 2N6027. The module is mainly intended to replace traditional indicator flasher relays on cars and trucks with low current LED lights. That said, a parallel resistor may be required across some LED lights to ensure proper operation. 1K (1000 ohms) should be ideal. Supporting the channel with a dollar or two on Patreon helps keep it independent of YouTube's quirks, avoids intrusive mid-video adverts, gives early access, bonus footage and regular quiet Patreon live streams. https://www.patreon.com/bigclive #ElectronicsCreators

Comments

Anonymous

Interesting little circuit. Most of the electronic flashers also have a mechanical relay or something to ‘click’ while in use. At least in my experience here in the US.

Lostngone

Interesting that it doesn’t work for its intended purpose.

bigclive

That may be the "can" bit. The Chinese sellers associate canbus compatibility with parallel resistors in their smoking hot LED lamps.

Mike Hughes

That was a very interesting video, and such a simple, yet very useful use of components.

Mike Page

It needs to bootstrap its internal supply, for which there will be a minimum load. Incandescent car indicator bulbs were 6W, don't know what the LED equivalent is. But that 1k shunt is a mere 144mW.

Charles

Fascinating; I wasn't familiar with PUTs. Great explanation!

Matt Tester

Great for prop making I suppose, just a simple way to make a flashing light at any speed you want without any noise.

Joel Murphy

its so weird... i guess if your mom used basic stamps and my gran used 555s, then everyone's great-grandma had to dig into the RC time constant to get anything done. what kind of power consumption does it rate at?how lossy is the blinky?

bigclive

Not sure its current rating. It has very low quiescent current of its own.