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Filter For Audio Measurements – Circuit Schematic
Filter For Audio Measurements
The purpose is supposedly to account for the fact that human hearing is less sensitive at low and high frequencies than in the upper midrange, and that this var...
RIAA Phono Equaliser – Circuit Schematic
RIAA Phono Equaliser
Vinyl equalisation (EQ) has been with us in a stable and predictable form for quite a long time, but for those who are interested in the old 78 rpm records ther...
12dB / Octave Linkwitz Riley Crossover – Circuit Schematic
12dB / Octave Linkwitz Riley Crossover
The circuit diagram of the filter section is shown in Figure 1. It is a completely conventional filter, and the component designations are the same as for the 2...
Reverse RIAA Equaliser – Circuit Schematic
Reverse RIAA Equaliser
I came up with this idea when I was in a situation where ... * I had an amplifier with an unused RIAA input and * I was missing another input for a ...
Subwoofer Equaliser – Circuit Schematic
Subwoofer Equaliser
The Linkwitz transform circuit (or EAS principle) will allow any driver to extend to 20 Hz or even lower. A good quick test is to stick the speaker in a box, an...
Distortion Analyser – Circuit Schematic
Distortion Analyser
Total harmonic distortion (THD) measurements are one of the most commonly quoted in audio. Contrary to belief in some circles, these can be very useful if perfo...
Balanced Line Driver & Receiver – Circuit Schematic
Balanced Line Driver & Receiver
With this simple project, you can have balanced lines too, simply adapting the unbalanced inputs and outputs of your hi-fi gear to become balanced, and then bac...
Direct Injection Box for Recording & PA – Circuit Schematic
Direct Injection Box for Recording & PA
A Direct Injection (or DI) box is a very handy piece of equipment for any public address rig or recording studio, whether for band or general use. It will allow...
Loudspeaker Protection – Circuit Schematic
Loudspeaker Protection
The detector circuit shown in Figure 1 (1) is simple and works well, and as shown will not trigger with a 30V RMS signal at 5Hz, but operates in 60ms with 30V D...
Refrigerator Pig – Circuit Schematic
Refrigerator Pig
Upon opening your fridge door the photocell is exposed to light and the piggy oinks. Reverse engineered circuit diagram is of an early commercial design which u...
Guitar Reverb II – Circuit Schematic
Guitar Reverb II
This is my second-generation guitar reverb circuit. The fidelity is much improved over the earlier design, it is suitable for use as a front-end to a guitar amp...
Guitar Reverb Effect – Circuit Schematic
Guitar Reverb Effect
This circuit features clipping indicators on the preamp and reverb recovery stages, allowing for the optimal gain settings. The guitar input stage is a class A ...
Panner Waveform Generator – Circuit Schematic
Panner Waveform Generator
This device is a microprocessor controlled waveform generator that can be used for driving a voltage controlled stereo panner for music applications. Panning is...
Auto Loudness Control – Circuit Schematic
Auto Loudness Control
Simple add-on module. A simple approach to this problem can be done inserting a circuit in the preamplifier stage, capable of varying automatically the frequenc...
Hi Fi mini mixer – Circuit Schematic
Hi Fi mini mixer
Input Amplifier Module: a low noise circuit equipped with a variable voltage-gain (10 - 100) pre-set, primarily intended as high quality microphone input, also ...
Two-tones Siren with IC 4093 – Circuit Schematic
Two-tones Siren with IC 4093
This circuit is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and various games and toys...
Simple Phono Preamplifier – Circuit Schematic
Simple Phono Preamplifier
Simple circuitry suitable for moving-magnet cartridges Passive high-frequency equalization. This simple but efficient circuit devised for cheap moving-magnet c...
sound detector tone decoder – Circuit Schematic
sound detector tone decoder
This circuit is designed to trigger on a 1 khz tone. to change this frequency - refer to the table below, then change the resistor and capacitor values accordin...
Removing the "DC Thump" from Audio Circuits – Circuit Schematic
Removing the "DC Thump" from Audio Circuits
You may be familiar with this effect. You switch audio equipment such as an amplifier to a different input and there is a loud click or "thump" in the speaker s...
Sound Operated Switch – Circuit Schematic
Sound Operated Switch
This sensitive sound operated switch can be used with a dynamic microphone insert as above, or be used with an electret (ECM) microphone. If an ECM is used the...