The circuit illustrated produces a short duration of rapidly-sequencing tones, invoking the stereotypical sonic imagery of a sophisticated computer, such as would be scripted for the science-fiction genre. I designed this circuit for use in the composition `Be Quite Still, ` by the popular band, `The Cassettes. ` A similar riff had been provided by
Click here to download the full size of the above Circuit.
a Moog Rogue analog synthesizer for the band`s studio recording, but dedicating the synthesizer to just this brief effect, alone, would have prevented its use for other parts of the composition in live peformances. The circuit is comprised of a 16-bit serial shift register (U3 and U4), clocked by multivibrator U1A-U1F, and employing data feedback via three exclusive-nor gates, U2B, C, and D. This implements a digital word generator that propagates pseudorandom data through the register, of which the first four bits are used to control the frequency of an audio oscillator, comprised of inverters U1B-U1C and quad analog switch U5. Similarly, bits 5 through 8 control a second audio oscillator, comprised of U1D-U1E and U6. The two squarewave oscillator outputs are fed to exclusive-nor gate U2A, which combines them in a manner similar to a ring-connected diode mixer, producing sum and difference frequencies of the two squarewaves, resulting in harmonically-complex tones at the AUDIO OUT jack. Flip-flops U7A and U7B, voltage regulator U8, and associated components form a power-control circuit that provides voltage to the tone generator for a duration of about two seconds. The duration is adjustable by varying the 270K resistor. U7B ensures that the circuit turns off after the last tone is completed, thus preventing the annoyance of a short interval at the end of the effect. To provide a large variety of tone pairs, the two...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
characters left: