Ir Sensor Circuit Diagram. As we know oscillation frequency of 555 timer is decided by. So this circuit can be built with two transistors like npn and pnp.
You can use any tsop but you need to generate ir of respective frequency as tsop. Ir transmitter circuit diagram. Pin 1 is vcc which is connected positive 5v supply.
For npn bc547 transistor is used whereas for pnp bc557 transistor is used.
We are using tsop1738 as ir receiver so we need to generate the modulated ir of 38 khz. Here in this infrared sensor the lm358 ic is used as a comparator for comparing the sensor and reference voltage. So we are using 555 timer in astable mode to oscillate the ir at 38khz frequency. As we know oscillation frequency of 555 timer is decided by.
