Long obsolete, the NE5044 was very popular back in the day, it was used by Micron, Fleet, Skyleader, Proline, World Engines, Hitec, Sanwa, Futaba and many more.
Often on a PCB it was buried under shielding as it could otherwise be prone to RF interference.
Attached is a datasheet (which is not the easiest to follow), and also the very best explanation I've found of the NE5044's operation, courtesy of Ace in their "Silver-7":
The Signetics NE5044 encoder
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Phil_G
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The Signetics NE5044 encoder
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- Ace_Silver_7_TX.pdf
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- NE5044.pdf
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Pchristy
- Posts: 431
- Joined: 16 Feb 2018, 13:57
- Location: South Devon, UK
Re: The Signetics NE5044 encoder
I started using these as soon as they came out! Very easy to set up and work with, it was an excellent little device - except for its prone-ness to RF interference!
It was bad enough at 35 MHz, manifesting itself as trim changes between aerial up and aerial down, but at UHF it was a nightmare!
No amount of decoupling would cure it. Eventually, I found that building it on a double sided PC board, with the component side acting as a ground-plane cured it completely!
So if anyone is considering making one, remember to use a double-sided board with a solid ground-plane on the upper surface!
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Pete
It was bad enough at 35 MHz, manifesting itself as trim changes between aerial up and aerial down, but at UHF it was a nightmare!
No amount of decoupling would cure it. Eventually, I found that building it on a double sided PC board, with the component side acting as a ground-plane cured it completely!
So if anyone is considering making one, remember to use a double-sided board with a solid ground-plane on the upper surface!
--
Pete