Polarity changer Switch

Posted on Mar 24, 2013

This project is useful if you wish to experiment with absolute phase, or are just interested in the possibilities of a polarity reversal circuit. In the case of absolute phase, many studies have shown that there can be an audible difference between polarities, but be aware that there is no way to really know for certain what the original phase was. Typical microphone methods mean that in some cases the polarity may be reversed compared to the way you may hear the same sound live. As a result, there is not necessarily a 'correct' polarity, since there are so many different ways that a signal may be processed before you hear it.

Click here to download the full size of the above Circuit.

The more conventional method is shown in Figure 1, and is simply an inverting buffer with a switch. Simple, and does exactly what is needed, but as noted above requires a double pole switch and 3 wires for each channel. While there is no requirement to have an especially low source impedance, it is highly recommended that it be as close as possible to that used for the inverter (typically 100 Ohms). By selecting the normal output or that from the inverter, the output polarity is inverted (or shifted by 180° if you prefer). The additional loading on the normal output is negligible, but it must be low impedance to prevent the normal and inverted signals from having different output impedance, and therefore possibly different levels. This circuit has similar constraints to the previous version - source impedance should be low, and in this circuit the impedance changes when the switch is opened or closed. With the values shown, Zin will be very high (typically >1M?) with the switch open, and 11k with it closed. This can be increased if desired by increasing the value of all resistors. A maximum of 100k is suggested to keep noise to the minimum, and to ensure that stray capacitance does not cause a problem (see construction notes below for more detail). Source impedance should be no more than around 220? if you use 22k resistors, or about 1k if you use 100k resistors. This gives an error of a little under 0.15dB. For...

Leave Comment

characters left:

New Circuits

Zero consumption Anti-theft High power Code Switch for E-Bike Batteries

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....
Ultrasonic distance finder circuit

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....
Simple Metal detector circuit with CD4030

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....
Fully automatic watering circuit for flower pots

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....
Simple deep searching metal detector circuit

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....
Sub-Harmonic Bass Converter for Electric Guitars

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,....
Echo Depth Sounding Sonar for Boats

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....
100W HiFi Audio Amplifier Circuit

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....
Plant-Pot Water Level Indicator Circuit

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.....

Create NOW your QR MENU for your Restaurant / Hotel / Bar / Caffe,

Comprehensive ordering/paying features. fully personalized to suit your Business.

Update Anytime! Easy and Simple!

Popular Circuits

simple microphone preamplifier

This is a simple microphone preamplifer circuit which you can use betw1een your microphone and...

Wirelessly Powering a Swarm of Robots

Wireless power transfer is nothing new; it has been discussed since Tesla`s patent in 1900...

Brushless DC motor control circuit

Brushless DC motor control circuit MC33035 and MC33039 uses a combination of the control circuit...

Electronic locks 555 monostable circuit diagram

Child lock voltage comparator 555 monostable circuit, a counter, JK flip-flop, UPS power supply...

Compound excited DC motor reversing circuit

Circuit shown in Figure 3-194. Motor is re-excitation type DC motor. The motor has six...