This circuit is a phaser circuit, as used in guitar foot-pedal effects. It used 11 sections of op-amp such as LM324 but others will do. The whole circuit works of a dual rail supply: +/- 9v. The 0v rail is indicated by a chassis sign. Make sure these supplies are well decoupled. There is a spare section of one of the IC's which you could used to derive a center tap from an 18v supply. The circuit works by means of an LED illuminating six cadmium sulphide photo sensitive resistors or LDRs: these six should be arranged in a circle around the LED so that they all get illuminated approximately the same. Exact matching does not matter too much. The whole photo assembly should, of course, be shielded from external lighting.
Click here to download the full size of the above Circuit.
Each CdS cell acts as a variable resistor in a single variable phase-shift circuit and there are six such individual phase shifters arranged in series, each increasing the overall shift.
The LED's brightness is modulated by an oscillator (bottom section of the circuit) whose frequency can be adjusted by the Speed pot. Max and min illumination are adjustable - the LED should not extinguish.
The LDRs control the shift of the six stages of the phase shifter. This phase shifter has overall feedback, varied by the Intensity control, to alter the intensity of the phasing effect by altering the overall phase shift.
Apart from that, there is an input buffer (top right) whose output feeds the phase shifter and also feeds through to the mixer stage where it is mixed with the phased signal.
I hope there are no errors in the circuit but it is given as is, without any obligation but of course we will answer all reasonable queries. Unfortunately I have been out of audio for some time now so cannot give too much assistance.
Modern phasers will use a digital delay line circuit, but this discrete version works and illustrates all the principles involved.
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: