Question about transimpedance amplifier

Ultimately anything with a photodiode is a light sensor.

Life wouldn't be fun if you weren't pushing the limits of what's possible, so I would suggest that you pick a photodiode at random, then assume you need to get the highest speed you can out of what you picked.

Domestic applications would include IR remotes; those are modulated at

This may be a good tutorial for the OP (can't see his posts) to learn about transimpedance amplifiers:

What also surprised me was that the remote for the DTV converter box used 32kHz instead of the usual 38kHz. Which brings up a question, since I want to (some day ...) build two IR repeaters so we can control stuff from outside on the deck: What is the range in which to expect remotes to transmit? Need that to set the filters.

I looked into that a while back. IIRC, It ranges from 32kHz to 58kHz in the pre-manufactured receiver modules.

I'd like repeaters from the patio, my office and the kitchen, into the great room where all the "stuff" is located.

...Jim Thompson

Pretty much the same here. If I ever get around to this I'll send you the schematics, or just publish them. I wish they had used RF for the remotes.

The trick will be in finding strategic locations where mirrors, cabinet doors such help the signal along. Of course I am married, meaning that those things occasionally move.

RF repeaters are an option but that clutters the tables even more. TV, lamp, fan etc.

Try a 9' granite dining room table, and quartz "end tables" that take

I'm thinking hard ball... wall-mounted receiver, wire up to attic and down inside great room wall, transmitter... perhaps hide in picture frame ?:-)

Or route thru ductwork.

...Jim Thompson

Doesn't work here. Cathedral ceiling, lots of firestops in floors and walls. Tried to route coax there, gave up after several hours and routed outside the house. BUT: I ran structured wiring everywhere. So ...

I have a walk-able attic, plus I'm a master at threading extra wires down the same holes as house wiring ;-)

Though I do think I could do it all line-of-sight plus a few mirrors... shoot to a pot shelf, then down to the equipment.

...Jim Thompson

The latter is often against code, could mean trouble when you (or your kids ...) want to sell the house some day. Trying to explain isolation signal transformers to a home inspector will likely not work.

A pot shelf? Now, now, Jim, what are you guys ...

C'mon, Joerg--just wire up a Costas loop and phase lock to the input. ;)

Cheers,

Phil Hobbs

On short bursts ?:-)

...Jim Thompson

I have a suspicion that some IR protocols don't have enough of a preamble or

I was once young and ignorant and didn't appreciate the value of DC-balanced codes... :-)

Nah, if I had my druthers it'd be two simple bowden wires or just ropes and pulleys. One to push play/stop and the other to push fast forward to skip commercials. But the WAF of this setup ain't high enough ;-)

I skip commercials by not watching TV. On the other hand, I also have one of these:

Incredibly useful sometimes.

Cheers,

Phil Hobbs

Cool!

Useless! No corkscrew ;-)

...Jim Thompson