Friday, June 03, 2016
AN-147 Low Cost IC Stereo Receiver
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.
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%,
Sunday, May 08, 2016
Recently i captured this circuit in eagle to publish online, it seems to have a small design error. It worked well for many years. The step-down transformer is used as a step-up here. The secondary winding was around 50mA so the resistance was protecting the 2N2222. (SL100 was used in the original one). C1 and R3 may need tweaking to get the desired adjustment range in R2.
Circuits using only discrete devices
The voltage across the speaker is fed to C1-Gnd, which blocks DC component. R1, R2, R3 form a threshold bias for T1. 2N2222 chops the 12V DC in tune with the music. The chopped DC current flowing in the 12V winding of TR1 is stepped up into AC pulses over 100V, this lights the Neon in flashes synchronizing in real-time with the beats. Known Issues - It does not perform well at low Bass like 20Hz.
Monday, November 02, 2015
I ran all the alsa and pulseaudio rituals. I got some luck, after updates audio was gone again. This device solves the problem. I suggest all linux users who have the "Dummy Audio Syndrome" to just use this device called USB Sound Card or USB Sound Adapter.
In the 386 days, it was a "SoundBlaster Card" for Music and Mic. Monitors had the "Trident SVGA card" both PC-Cards not integrated on Motherboard to get Audio and Video going. Now all things are onboard. In the future all things on one Silicon Chip or maybe One Graphene Slice. It will be called "The Tortilla"
Make your own DIY USB Sound Card
Miroslav Batěk from Prague in Czech Republic has made many neat diy projects and posted them with full details in his blog Diy4Fun
Make a Sound Card with PCM2704 an IC from Texas Instruments.
This device is fully functional sound card for PC. The main advantage of using PCM2704 against PCM2702 is much easier construction. As you can see on the block diagram it has built-in 5V and 3.3 voltage regulator, HID interface (MUTE, VOL+, VOL-), S/PDIF output.
Tuesday, November 18, 2014
Ray Wilson - Music From Outer Space
"This is a beginner project and I do recommend it as a first project or if you are just getting started in synths or electronics. The circuit, layout and wiring diagram are provided to help you succeed."
Try Building A Simple - Weird Sound Generator.
"This is a really fun project and it makes a LOT of weird sounds. You will have hours, no at least days... weeks of fun making weird sound after weird sound."
Saturday, January 21, 2012
Dedicated Website for Audiophile projects, such as a Diy High End DACs, Loudspeakers, Tube Amplifiers - Doede Douma
- Setting up an Audio Streaming Server (for use with the DDDAC1543 MK2 - USB)
- Gydinel, the Loudspeaker Master Reference ……
- Something completely different: Building your own Home Cinema !!!
TUMOS, the MOSFET Power Amplifier with real Tube sound!
"The DIY of designing and building of your own equipment is not only very satisfying as hobby on itself, but it will save you money, which you can invest in better parts used or parts you cannot build yourself like Turntables, cartridges etc."
Monday, August 15, 2011
Here you will find Audio Oriented projects, many in the German Language. There is one - Converting Analog into Digital (IIR) Filters which is useful for Mixed Design students. Then there is a FPGA-Based Digital Audio Peak Level and Correlation Meter with many features. The Hi-Fi Audiophile will like the Tools - Audio Preamplifier, Weighting Filter Set and Universal Filter.
"It is very well known what kind of deviations from the original signal a human ear is able to hear (e.g. distortion, frequency
response, noise etc.) and also in which amount and under which circumstances this is the case. All these deviations from the original
signal are measurable with a precision and sensitivity far, far superior to the human ear...."
Delta sigma converters are different from other converters. Note that I do not make a difference between analogue-to-digital (ADC) and digital-to-analogue converters (DAC). Both are very similar and what is realized in one of them using analogue signal processing circuitry is implemented in the other one using digital signal processing and vice versa. I will explain the delta sigma technique with the analogue-to-analogue delta sigma converter as the first object.
Friday, May 20, 2011
From Schematic to Reality
Here is a nice page with refreshing illustrations, this page helps initiate a Electronics Newbie in the complex science of Schematic Reading.
Phantom Power and Microphone Interconnect Basics
What's that you say? You don't know your AC from your DC' Audio is considered an Alternating Current, a.k.a. "AC." (So is 120-volt "wall" power.) But electronic circuits need Direct Current (DC) to turn them on, from batteries or power supplies.
The Electric Web Matrix
DIY Pages and Know-How for those who love vacuum tubes, computers, and hearing music in its pristine form. There is an Audio and Electronics section is for the DIY computer audiophile.
My Notes - Even though i had Electronics Junk in my lab, when i was at school. (I used to call it Nuts-n-Bolts) The first project i saw being built by a friend was a Guitar Pickup using Germanium Transistors/Diodes. This was my first semiconductor schematic reading. Get into electronics now with a Audio Project, or ....
Sunday, May 16, 2010
Specialists in very high quality audio, Designs Amplifiers, Preamplifier, Phono Preamplifier and R-evolution Turntable etc.
Adapting New Technologies into Classic Hi-Fi systems, without compromising on Decades of Audio tradition.
MITA The Mains Independant Tube Amplifier
SE battery tube amplifier
Stereo SE 15w / Channel, Three Silver Rock transformers per channel, Fully Lithium battery powered, All silver internal wiring, Veneer to customer's request.
Saturday, May 15, 2010
Audio Hi-Fi DIY - Claudio Bonavolta
(Proper Loudspeaker Design is more complex than Launching Rockets into the Ocean )
Tapered Quarter Wave TubeFirst described by Paul Voigt in 1930, TQWTs allow a good quality-to-price ratio. They are also easy to build.Similar to transmission lines, the TQWT is different by its shape, a kind of horn is used as back load but the driver is not placed at the beginning of the cone as usual but on its side.
In closed boxes, the back wave of the speaker should be completely absorbed (= converted in heat) by the damping material.As the speaker is nearly transparent to sonic waves, if a back wave returns after a reflection on the back wall, some part will also come out through the speaker with some delay giving a not very clean sound.
Friday, October 23, 2009
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.
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.
Industrieweg 14, NL7161BX, NEEDE, The Netherlands.
Sunday, September 07, 2008
Monday, June 23, 2008
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.