ir receiver circuit using tsop
The TSOP 1738 datasheet states that the burst length should be 10 cycles/burst or longer, OR between 10 cycles and 70 cycles and a gap time of at least 14 cycles is necessary.
1 "cycle" here means inverse of 38kHz, right?
That works out to 26.32usec
40(average of 10 and 70) cycles works out to an ON time of 1.05 msec.
20(taking a round figure above 14 cycles) works out to an OFF time of 0.526 msec.
am i right in these conclusions?
3>> Going by the above calculations, i've changed the values of the timing resistors connected to the first IC555.
4>> The first IC 555 is in astable mode, and the second in astable mode, right?
Despite doing all this, the o/p of TSOP is not present.
What can be wrong ?
5>>Should the emitting infrared diode be the one specified in the datasheet, i.e. TSAL 6200, or will any infrared emitting diode do?
6>>How dp i check whether the TSOP is not faulty ?