NOTE: A similar kit is available at buildcircuit store. Please check the store.
You can make this project using phototransistor as well as photodiode.
Follow the following steps:
a. Make a melody generator using UM66 and replace the speaker with infrared LED.
c. Orient infrared LED towards phototransistor/photodiode, you will hear the melody on the speaker.
In this project, infrared LED is oriented towards phototransistor/photodiode. When melody generator is played, infrared LED transmits melody signals to photodiode. The signal is amplified by the 741 operational amplifier and fed to audio amplifier. You can control the volume of melody with 10K variable resistor connected to LM386.
(PLEASE IGNORE THE REPEATED NAMES OF COMPONENTS. TRY TO SEE THE PROJECT IN SEPARATE MODULES)
WATCH THE VIDEOS:
a. Circuit using phototransistor:
b. Circuit using photodiode:
You can buy a similar kit at buildcircuit store