small ir remote control question

There's no standardization in codes between manufacturers - the IR beam is modulated with a digital signal to tell the device what to do. A particular number of pulses, length of pulse, will vary from one manufacturer to the next, for the same function.

"Universal" replacements are programmed with lots of different manufacturer codes and it is up to the consumer to find the right one (following the instructions)

"Learning" controls, require a working remote to program the replacement.

Makes a lot of sense IMO to get a universal and use it instead of the one supplied with the product - since the universal seldom provides all the functions of the original. The universal will do the common stuff with no problem but may not access the more esoteric functions (like "menu," locking out channels, adjusting hue or color, etc.).

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Good design.

If one worked on another, then how would you control a tv set and a vcr in the same room?

The infrared LED in the remote is fed by a constant frequency, and that frequency may vary from design to design.

And then, that frequency is modulated by control codes, and those will most definitely vary from design to design.

It's like keys and locks. If you don't have the right key for the right lock, then you can't get in, but that also makes it difficult for someone else to get in.

Michael

it's like they speak different languages.

Bye. Jasen