Audio Music

Audio Amplifiers, Preamps, MP3 Players, Musical Instruments.

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This was a National Semiconductor Application Note, now TI. – Low Cost IC Stereo Receiver.

AN-147 Low Cost IC Stereo Receiver

Some Highlights

The LM3089 FM IF System does all the major functions necessary for FM processing, including a three stage amplifier/limiter and balanced product detector, as well as an audio preamplifier.

FM stereo demodulation is accomplished by the use of the LM1800 phase locked loop, thereby eliminating the need for external coils.

The AM function of the receiver is done completely with the LM3820 AM radio system. While designed for 3 section tuned superheterodyne application.

The LM382 dual preamplifier was selected for its minimum parts count and low noise capability.

Panel meters are employed in the FM system for both signal strength and center tuning, allowing for easy and accurate tuning. A directly driven LED offers immediate indication of FM stereo reception.

Low Cost AM FM Stereo Receiver

A single transistor tone control circuit was designed as the optimum cost/performance trade-off. The transistor is configured in a shunt-shunt feedback design, allowing gain variations between input functions.

The stereo power section, consisting of the LM378 dual audio amplifier, delivers 3W/channel with total harmonic distortion (THD) less than 1% and 4W/channel with THD less than 10%,

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Amplimo has got a very large range of toroidal transformers available directly from stock. Standard range transformers have been approved by KEMA and UL . Built and tested according to the international standard EN61558 .

Amplimo – Toroidal Transformers

Sstandard range have a 230V primary and two equal secondary windings. These windings can be used individually or can be used in series or in parallel.

Amplimo - Toroidal Transformers

Standard range transformers are also available with 2x 115V primary to be used in series or in parallel.

Toroidal-Transformer.com – Here you can order Toroidal Transformers.

Amplimo presents a generation of amplifier modules offering outstanding advantages, allowing the rapid construction of quality audio amplifiers for many applications. These hybrid modules contain the complete audio amplifier circuit for connection between the preamplifier or mixer and loudspeaker, they are very stable even with complex loads and are therefore very reliable as the likelyhood of oscillation has been reduced to a minimum.

Amplimo BV
Industrieweg 14, NL7161BX, NEEDE, The Netherlands.

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This site is offered in the hope that readers will better understand electric guitar technology, leading to creative use of your musical tools. Of course, only practice will improve your musical vocabulary and articulation….

GM Arts – Music Guitar Science

“Hello World! I live in Adelaide, South Australia, and my interests are electric guitar, playing live music, writing MIDI sequences, programming in Visual Basic, dabbling in electronics, with a casual interest in popular science. I have some years of experience in these fields, and use these Web pages to share my knowledge freely. ..”

GM Arts - Music Guitar Science

Electric Guitar

Most musical instruments and their amplification systems, such as those used for public address (PA), recording and hi-fi are designed to reproduce sound as accurately as possible. Electric guitar and its amplification is completely different: every item in the guitar signal chain is designed to modify the raw guitar signal in some way.

  • Guitar Amplifiers – valves vs transistors, some overdrive circuit ideas.
  • Guitar Pickups – get the most out of them alone and in combination,
  • MIDI Music – A guide on MIDI messages, circuit for a PC-MIDI interface.

Related Resources –

  • Pickup Winder Web Page
  • Overdrive schematics – partial designs
  • Pickup wiring and switching ideas

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Here is a collection of web pages of VU Meter projects that helps a newbie getting into the Electronics DIY Hobby Land.

VU Meter Circuits and Projects

A Hobby now in your School days or College can help you build a strong profession later. It is Edutainment that will make productive use of your spare time. Friends can do it as a group, during holidays. Parents should encourage healthy hobbies, as the children will grow in a positive and creative atmosphere.

Stereo led level meter – This is it. It’s a STEREO LED LEVEL METER. It’s the cheapest and best bar graph display available and best of all, it uses readily available components.

VU-meter by Archy – Then it hit me. A VU meter, big, beautiful, professional! From that moment started my thoughts flowing. Those VU-meter ICs that are sold in every electronics shop?

LM3914 dot-bar display driver – The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display.

Knight Rider Display Project – This project started out as a VU meter. I reused parts and pieces to improve the VU meter and give it additional functionality. It is amazing how much time it takes to create a small thing like this.