Space Age Sound Machine Circuit


Posted on Oct 8, 2012

The space-age sound device uses a 556 dual-times IC to produce a phasor sound. That IC is actually two 555 timer ICs in one 14-pin package, as shown in the schematic. Each timer inside the 556 is connected iri an astable multivibrator mode. The first timer has its frequency set by Kl, R2, and Cl. Its output appears on pin 5 and it is coupled through C2 and R5 into the trigger input of the second timer. The second timer has an adjustable frequency that is controlled by PI, R6, and C3. In the second timer, the first frequency mixes with the second frequency and produces the pha-sor-like sounds.


Space Age Sound Machine Circuit
Click here to download the full size of the above Circuit.

The output of the second timer, which has the two signals mixed together, is brought from pin 9 through limiting resistor R7 to the input of Ql. The function of pnp germanium power transistor Ql is to amplify the signal to the level that is needed to drive the speaker. The green LED, LI, converts electrons directly into visible photons (light) in time with the pulses from the speaker. The purpose of resistor R8 is to limit the current through the LED to a safe level.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Digital LCD thermometer ( PIC16F871 )
Sca background music decoder
Sequential timing
Low-Cost Window Comparator
ColonBlow robot
Driving a Bipolar Stepper Motor with Arduino and ULN2803AG
2003 Ford: Crown Vic Acceleration (hot) sometimes instrument cluster
Test Instruments and Measuring Devices
ISO122 124 filter circuit diagram
Laser power supply circuit



Top