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Phono Preamplifier – Circuit Schematic
Phono Preamplifier
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Passive RIAA Preamplifier – Circuit Schematic
Passive RIAA Preamplifier
There are two types of preamplifiers for magnetic phono cartridges. An example of the most common type is the one described in the March 2002 issue of SIL.....
Modular Preamplifier Switching Center – Circuit Schematic
Modular Preamplifier Switching Center
Four high level inputs, Double Bar switching This module can be a necessary addition to the Modular Preamplifier Control Center when more than two sources.....
Mini Audio Signal Generator – Circuit Schematic
Mini Audio Signal Generator
A small audio test generator is very useful for quickly tracing a signal through an audio unit. Its main purpose is speed rather than refinement. A single.....
IR S/PDIF Transmitter – Circuit Schematic
IR S/PDIF Transmitter
The best-known ways to transmit a digital audio signal (S/PDIF) are to use a standard 75? coaxial cable or Toslink optical modules with matching optical c.....
IR S/PDIF Receiver – Circuit Schematic
IR S/PDIF Receiver
This simple circuit proves to achieve surprisingly good results when used with the IRS/PDIF transmitter described elsewhere in this site. The IR receiver.....
IR Music Transmitter and Receiver – Circuit Schematic
IR Music Transmitter and Receiver
Using this circuit, audio musical notes can be generated and heard up to a distance of 10 metres. The circuit can be divided into two parts: IR music tran.....
Hybrid Headphone Amplifier – Circuit Schematic
Hybrid Headphone Amplifier
Potentially, headphone listening can be technically superior since room reflections are eliminated and the intimate contact between transducer and ear mea.....
Guitar Control – Circuit Schematic
Guitar Control
Stand-alone, 9V battery powered unit, Three-level input selector, three-band tone control This preamplifier was designed as a stand-alone portable unit, u.....
Electric Guitar Preamp Mixer and Line Driver – Circuit Schematic
Electric Guitar Preamp Mixer and Line Driver
Depending on its design an electric guitar may have anything from one to six pickup elements. Classic (acoustic) guitars could also benefit from one or mo.....
Dual Input-Combining Stereo Line Amplifier – Circuit Schematic
Dual Input-Combining Stereo Line Amplifier
This circuit takes two separate line-level stereo (L & R) signals and combines them into one stereo (L & R) output, thus avoiding the need to switch betwe.....
DIY Tremolo Effect – Circuit Schematic
DIY Tremolo Effect
This tremolo effect circuit uses the XR2206 and the TCA730 IC which is designed as an electronic balance and volume regulator with frequency correction. The cir...
DC-Coupled Audio Amplifier – Circuit Schematic
DC-Coupled Audio Amplifier
Designs for audio amplifiers with DC coupling to the load are not often encountered these days, even though they offer definite advantages. One advantage.....
Cuckoo Sound Generator Circuit Schematic – Circuit Schematic
Cuckoo Sound Generator Circuit Schematic
Agreeable, very close sound imitation, Suitable for sound effects, door-bells etc. This circuit generates a two-tone effect very much alike the cuckoo son.....
Condenser Mic Audio Amplifier – Circuit Schematic
Condenser Mic Audio Amplifier
The compact, low-cost condenser mic audio amplifier described here provides good-quality audio of 0.5 watts at 4.5 volts. It can be used as part of interc.....
Balanced Microphone Preamplifier – Circuit Schematic
Balanced Microphone Preamplifier
The preamplifier is intended for use with dynamic (moving coilMC) microphones with an impedance up to 200 ? and balanced terminals. It is a fairly simple.....
Balanced Microphone Amplifier – Circuit Schematic
Balanced Microphone Amplifier
We published a design for a stereo microphone preamplifier with balanced inputs and a phantom power supply. The heart of this circuit was a special Analog.....
Aviation Intercom – Circuit Schematic
Aviation Intercom
Before its move offshore, I was lucky enough to be involved in developing the avionics system for the Flightship Ground Effect FS8 craft.....
Automatic Loudness Control – Circuit Schematic
Automatic Loudness Control
Simple add-on module, Switchable “Control-flat” option In order to obtain a good audio reproduction at different listening levels, a different tone-...
Audio VU Meter – Circuit Schematic
Audio VU Meter
This circuit uses two quad op-amps to form an eight LED audio level meter. The op-amp used in this particular circuit is the LM324. It is a popular IC and shoul...