The construction of this quite complicated circuit will be awarded with the joy of generating almost unlimited sound effects. The circuit can produce different sounds like
the heavy chopping of a helicopterīs blades up to the fine chirping of a bird.
A vibrato generator (T1 and T2) modulates a tone generator (T3 and T4). The frequency of the vibrato generator can be varied through P2. A second vibrato generator is also
built (T6...T10) and has the same function as the first one described.
The noise sound is produced by T6 while transistors T7 and T8 amplify the generated noise sound. The potentiometers P3, P8 and P4 influence the amplitude of the generated signal
and create the desired sound effect. Potentiometers P5,P9,P10 produce the desired noise envelope and strength. The mixed tone and noise signals appear at the emitter of T14.
Experimenting with different potentiometer settings will certainly produce hours of enjoyment and lots of unique sound effects.
Electronic Circuits volume 1.0 - Circuit Nr. 88
The complete data of the electronic circuit described above can be found in the following book and is available from Amazon.com.
Click on the image to view the book.