headphone circuit

Posted on Feb 7, 2014

Here is a very simple passive headphone box that I have made that works really good. I have used this headphone box in several recording studios that I have worked in and have made them for different people. Because there are no active components, there is very little that can go wrong with it and it is very quick to make. I have used this headpho

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

ne box where I had to record backup vocals with several people at a time. Because there are no potentiometers, you are not able to adjust the individual volumes of each headphone. It is also recommended that you use headphones that are similar to each other, especially the impedance. If not some headphones will be louder than others. You have to rely on the power of your power amp or your headphone out of your amp or your mixer headphone out to power it. Each channel of each headphone has a resistor in series that acts as a buffer. This is so that the load of each headphone will not effect each other or at most, very little. This is the same principal as how audio mixers work. Depending on if you are using a power amplifier or a signal from a headphone out on a mixing board you will have to experiment with the resistor values. If the signal came from a headphone out on a mixer I would normally use 180 ohm resistors. I wouldn`t go too much lower as you will start to notice volume cuts on the headphones as more headphones are plugged in. This is not a terrible thing, but this means that the load of the headphones are starting to effect each other. If I was using the speaker out of a solid state studio power amp (100 watts or so), I usually use 280 to 330 ohm resistors. In either case, your volume is controlled from your power amp volume or your mixer headphone out volume. I built it in an old plastic box that I had in my junk...

Leave Comment

characters left:

Related Circuits

cut the feed forward in the miller compensation with voltage buffer

An internally compensated operational amplifier is described which has been fabricated using n-channel Al-gate MOS technology. Only enhancement mode devices are used, and the circuit has been...

0 to 24 hour clock

3volt FM TRANSMITTER PROJECT

This project provides the schematic and the parts list needed to construct a 3V FM Transmitter. This FM transmitter is about the simplest and most basic transmitter to build and have a useful...

Knight Rider Circuit

In the Knight Rider circuit, the 555 is wired as an oscillator (Astable mode). The output of the 555 is directly connected to the input of a 4017 decade counter. The input of the 4017 counter is...

Dark Sensor circuit

More debugging of the NRI 832

I`ve made more headway. The other day I built a 6kHz oscillator using a 555 to produce a clock signal that I could inject into the 832. You can see the trace on the scope, and the oscillator itself...

Visual Target Tracking Sysyem

The Visual Target Tracking System (VTTS) is a system for visually tracking targets using a gimbal mounted camera and digital control circuitry. A small black and white camera is mounted on a stand...

BMW Remote circuit

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.....