ericyeoh said:any one can help me for this circuit below?
is that any problem with this circuit in the link? **broken link removed**
can anyone tell me? the circuit never mention what type of IR LED be use, so i just simply buy and use it, anyway is it possible the problem of transmit?
I saw some forum dicuss by putting 2 IR LED at the output (pin3) of 555
what for ??
Can you kindly point me to the exact place, where to find this result (I'm just interested to understand the involved optical effort). Unfortunately, I missed it in the said ATV IR remote control link.a microprocessor driving an IR LED via a 555 to operate a VCR over a 50 mile (80Km) range
A single BJT transistor allows to adjust the current drive level according to your needs, without worrying about 555 specifications.There are notes elsewhere in the web pages about different types of 555 and why some will work and others not.
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