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03/06/2014
Still online, we are. The code for this website is getting old, but still works well as far as I've seen. I may update it with new code and new features eventually, one day when I have both free time and focus. Until then, the content is still useful, I'm keeping it online. Comments and donations are welcome, but include your email address if you want a reply.


09/04/2010
Ideas for the future of the site -
Here are some ideas I've been brainstorming. I don't think to much of the site should change, because it has been successful all these years with very little change. still nearly 1000 visitors a day to the site!
  • donations - I think it might be time to make some changes to the donations. I would rather see people get a lifetime membership and not have to worry about an expire date. here's an idea, a smaller recurring payment monthly, or 4 times a year, then maybe offer a second option, donate enough to cover the cost of the server for one month and you'll get a lifetime membership that never expires.
  • automated account creation - the membership process should be automated. I rarely hear a complaint about anything, but I don't think people feel so safe emailing me a username and password to set up an account. I think people may feel more safe dealing with an automated system. make a donation, then type your account into right in to the computer and have it set up on the spot.
  • members only forum - the site doesn't seem to need a full forum, but it could still benefit from a single simple board or mailing list, maybe. still optional, but maybe only available to members. non-members wouldn't be able to post on or see the forum. for those who donate to openly communicate.
You can send me your comments in the form above. I'm not putting any work into these changes without getting feedback from you!
If we have any web developers out there, we'd love your help! come on, my birthday's tomorrow!


12/20/2009
Better forum? -
We are currently using vbulletin, but maybe there's a simpler alternative that would better fit the site. What do you think of this one? http://schematicforums.com/seo/ Please let us know what you think, keep vBulletin, or switch to SEO. Comment box is below.


09/29/2009
ideas or comments?
please send us your comments or suggestions or any ideas you might have for the site. this is the easiest way for you to let us know what you think. just type in the box above and send.

Thank you, everyone who has helped support the site over the years. you've done your part, now help me do my part to improve the site with your input.




11/25/2009
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05/07/2008
new server -
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01/24/2008
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Last Accessed Size  File
10-25-14 1763938  120 W x 2 Channel Class D Audio Power Amplifier Using IRS20955 and IRF6645.pdf
10-25-14 80630  1200W Class D Power Amp.pdf
10-25-14 12425  12V Class D amp.pdf
10-25-14 213515  16W+16W Stereo Class-D Amplifier 50W Mono Btl.pdf
10-25-14 1772348  1kW Buffered To220 IRS2092 Class D Amp using modified IRAUDAMP5 rev2d.pdf
10-24-14 558146  A Little Theory Of Class-D Amplifiers.PDF
10-25-14 103424  A Simple Guide To Selecting Power Mosfets.pdf
10-24-14 2046360  Amplifier-Power - Digital 200W - Hip4080.pdf
10-24-14 1572389  Amplifier-Power-Class D - Digital Power Amplifier - Hip4080.pdf
10-24-14 1572389  Amplifier-Power-Class_D_-_Digital_Power_Amplifier - HIP4080.pdf
10-24-14 2046360  Amplifier-Power_-_Digital_200W - HIP4080.pdf
10-25-14 254976  Analog PWM Amplifier.pdf
10-22-14 254976  Analog Pwm Amplifier.pdf
10-25-14 1007682  Assorted Class D stuff.zip
10-25-14 954643  Assorted Class-D Info.ZIP
10-25-14 1572389  Build A 200W Class D Power Amplifier For Your Car.PDF
10-25-14 782839  CLASS D - HUYGENS MCD TECHNOLOGY.xps
10-25-14 5121  CLASS D PWM car amp with no inverter - 7406 Sub.jpg
10-25-14 30686  CLASS D PWM car amp with no inverter - output transormer.jpg
10-24-14 55103  CLASS D PWM car amp with no inverter.jpg
10-25-14 72551  Car Amp 1.pdf
10-25-14 98428  Car Amp 2.pdf
10-25-14 100530  Class D Amp App Note From On Semi.pdf
10-24-14 84093  Class D Amp Development 30 Dev.ZIP
10-24-14 19849  Class D Amp Level Shifter For Half Bridge Operation.JPG
10-24-14 38848  Class D Amp a6rg2.jpg
10-18-14 100530  Class D Amp app note from ON Semi.pdf
10-25-14 12911  Class D Amp design Idea.gif
10-24-14 176397  Class D Amp.ZIP
10-25-14 1664539  Class D Amplification Circa 1965.pdf
10-25-14 13824  Class D Amplifier Calculations - Texas Instruments.xls
10-25-14 90804  Class D Amplifier Discrete Driver Stage.JPG
10-19-14 20480  Class D Amplifier Power Out vs Current.xls
10-25-14 12911  Class D Amplifier with Discrete Level Shifter.gif
10-21-14 168960  Class D Amplifiers - Interactive Simulations.PDF
10-19-14 514054  Class D Amplifiers Fundamentals of Operation and Recent Developments.mht
10-23-14 55307  Class D Amplifiers Provide High Efficiency For Audio Systems.PDF
10-25-14 396689  Class D Audio Amplifier Output Filter Optimization - Maxim.mht
10-25-14 53110  Class D Audio Amplifier Output Filter Optimization.mht
10-25-14 521644  Class D Audio Amplifier Output Filter Optimization.pdf
10-09-14 311700  Class D Audio Amplifier Output Filter Optimization.xps
10-22-14 242688  Class D Audio Amplifier Performance Relationship to MOSFET Parameters.pdf
10-21-14 55762  Class D Audio Amplifiers - Theory and Design.mht
10-21-14 852144  Class D Audio Amplifiers - Theory and Design.xps
10-22-14 277814  Class D Audio Amplifiers - What Why and How.pdf
10-24-14 21504  Class D Design Guide.pdf
10-21-14 52167  Class D Discussion.PDF
10-22-14 230400  Class D For Diy.pdf
10-24-14 77481  Class D IC amps.PDF
10-24-14 77481  Class D Ic Amps.PDF
10-19-14 70015  Class D OEM product FAQ.mht
10-24-14 17231  Class D Oem Product Faq.ZIP
10-17-14 5213  Class D Power Calculator Excel Spreadsheet.ZIP
10-24-14 24576  Class D Power Calculator.xls
10-04-14 253967  Class D Product FAQ.xps
10-23-14 79638  Class D Pwm Amp With No Inverter.ZIP
10-25-14 5121  Class D Pwm Car Amp With No Inverter - 7406 Sub.JPG
10-25-14 30686  Class D Pwm Car Amp With No Inverter - Output Transormer.JPG
10-25-14 55103  Class D Pwm Car Amp With No Inverter.JPG
10-25-14 1656605  Class D Subwoofer Amp.pdf
10-20-14 1409804  Class D Tutorial.pdf
10-21-14 72551  Class D amp with IR Driver Chip.pdf
10-24-14 13824  Class D amplifier Calculations - Texas Instruments.xls
10-24-14 127758  Class D amplifier using TL494.jpg
10-21-14 55307  Class D amplifiers provide high efficiency for audio systems.PDF
09-27-14 225235  Class D amplifiers provide high efficiency for audio systems.xps
10-25-14 283649  Class D amplifiers.xps
10-19-14 168960  Class D audio-power amplifiers - Interactive simulations.pdf
10-25-14 168960  Class D audio-power amplifiers.pdf
10-07-14 52167  Class D discussion.PDF
10-24-14 230400  Class D for DIY.pdf
10-25-14 13703  Class-D Amp 11_mk1-1b-schalt.gif
10-21-14 1664539  Class-D Amplification Circa 1965.pdf
10-25-14 537864  Class-D LC Filter Design.pdf
10-14-14 918783  Class-D Stereo Amplifier (Not in English).pdf
10-25-14 288538  ClassD2.pdf
10-25-14 60697  Combined Power Supply And Audio Amplifier.PDF
10-20-14 112938  Component selection, layout lead to success with Class D audio amps.mht
10-14-14 464502  Component selection, layout lead to success with Class D audio amps.xps
10-23-14 515  Crown Input Board.pdf
10-23-14 515  Crown K series Service Manual.pdf
10-23-14 515  Crown Main Board.pdf
10-25-14 515  Crown Output Module.PDF
10-25-14 97134  D Amp Class D Power Amplifier.PDF
10-07-14 96392  D Amp_.pdf
10-21-14 6653422  DDX Amplifier Stuff.zip
10-20-14 26020  DIY1.pdf
10-24-14 216987  Demand Switched Power Supply for Amplifiers.pdf
10-15-14 11956  Design Of A Car Power Amp.ZIP
10-19-14 505744  Diagnosing Automotive Faults with Class D Audio Amplifiers - Maxim.mht
10-20-14 70245  Digital Amplifiers Challenge Analogue Audiophiles.PDF
10-21-14 503004  Digital Does Analog.pdf
10-14-14 63804  Digital Power Amplification Based On Pulse-Width Modulation And Sigma-Delta Loops.pdf
10-20-14 63804  Digital Power Amplification based on Pulse-Width Modulation and Sigma-Delta Loops.pdf
10-23-14 1572389  Digital Power Amplifier.PDF
10-24-14 122903  Diode Only Audio Power Amplifier.pdf
10-25-14 53773  Direct1.JPG
10-25-14 28095  Discrete Class D Amp Front End V2.JPG
10-25-14 28939  Discrete Class D Amp Front End.JPG
10-21-14 30612  Drive Circuit.pdf
10-20-14 120707  Efficient Pa Amplifier.PDF
10-21-14 57957  Efficient Speech Only Amplifier.PDF
10-04-14 12459  Gain Control Devices, Side Chains, Audio Amplifiers.ZIP
10-25-14 207872  HIP4080A.pdf
10-22-14 13864  HUYGENS MCD TECHNOLOGY.mht
10-20-14 182122  HV Floating MOS-Gate Driver ICs AN-978.pdf
10-23-14 996352  High Efficiency Power Amplifier Design.PDF
10-06-14 996352  High Efficiency Power Amplifier Design.pdf
10-25-14 95250  High Fidelity Switching Power Amplifiers AN1042-D.PDF
10-21-14 1077248  High Power Class D Audio Power Amplifier Using Ir2011S.pdf
10-25-14 1077248  High Power Class D Audio Power Amplifier using IR2011S.pdf
10-24-14 3299564  High Power Class-D Audio Amplifier Using the IR2011S.pdf
10-23-14 1088502  High Power FET Audio Amplifier.pdf
10-25-14 116551  High power, high quality discrete Class D amplifier 75015527.pdf
10-20-14 204800  Hip4080A Class-D Power Amplifier Driver Ic.PDF
10-13-14 207872  Hip4080A.pdf
10-11-14 658062  Hypex Instructions.zip
10-20-14 112937  Hypex Ucd180 Amplifier Connection Diagram.PDF
10-21-14 56795  IR Amp.pdf
10-23-14 1659983  IR Reference Design - Half Bridge.pdf
10-21-14 57290  IR2011 and IRS2011 Comparison.pdf
10-24-14 64921  IRS20954S and IRS20955S Comparison AN-1129.pdf
10-22-14 1660928  Ir Reference Class D Amp Design.PDF
10-16-14 1659983  Ir Reference Design - Half Bridge.pdf
10-25-14 1974045  JBL 1500Array sm.pdf
10-21-14 40328  Jam Technologies Amplifier.PDF
10-23-14 1430749  LM4682 10 Watt Stereo CLASS D Audio Power Amplifier.pdf
10-13-14 114688  LX1720 High-Efficiency Amplifier.pdf
10-18-14 660588  Layout Guidelines for Class D Power Amplifiers.pdf
10-20-14 663545  Layout Guidelines for TPA300x Series Parts.pdf
10-12-14 1244588  Layout Issues for Class D amps.xps
10-10-14 180962  Leapfrog Switching Amplifier Control Loop Design.PDF
10-25-14 130956  Leapfrog Switching Amplifier Control Loop Design.pdf.FILEPART
10-22-14 73728  Leapfrog.pdf
10-16-14 214016  Listening To Class-D.pdf
10-16-14 214016  Listening to Class-D.pdf
10-06-14 199680  Low Power Pwm Circuit And More.PDF
10-25-14 114688  Lx1720 High-Efficiency Amplifier.pdf
10-25-14 2591229  MCD Class D Power Amplifier TECHNOLOGY.xps
10-25-14 44012  MIC5011.PDF
10-25-14 26618  MOSFET Drive.pdf
10-17-14 239616  MOSFET selection guide.pdf
10-08-14 2846296  MUETA􀂮 CLASS-D.zip
10-25-14 451584  Magnatec Class D Amp Application Info.pdf
10-25-14 221184  Magnatec Class D Amp Switching Power Supply.pdf
10-20-14 451584  Magnatec Class D amp application info.pdf
10-20-14 221184  Magnatec Class D amp switching power supply.pdf
10-20-14 1887269  Measuring Switch-mode Power Amplifiers.pdf
10-20-14 18432  Microdesign Amp AUX Supply.pdf
10-05-14 18432  Microdesign Amp Aux Supply.pdf
10-08-14 34816  Microdesign Amp PWM Stage.pdf
10-22-14 17408  Microdesign Amp Pre-Regulator.pdf
09-25-14 34816  Microdesign Amp Pwm Stage.pdf
10-22-14 34816  Microdesign Amp SMPS.pdf
10-11-14 34816  Microdesign Amp Smps.pdf
10-04-14 1207296  Microdesign Amp Thesis.pdf
10-25-14 1310967  Microdesign Class D Amplifier.pdf
10-11-14 193536  Monolithic Audio Mp7530.pdf
10-25-14 10129  Mosfet H-Bridge.GIF
10-09-14 239616  Mosfet Selection Guide.pdf
10-25-14 96256  ON Semi Class D paper.pdf
10-21-14 57344  Off Line Pwm Amplifier - Peavey.pdf
10-25-14 57344  Off line PWM Amplifier - Peavey.pdf
09-21-14 96256  On Semi Class D Paper.pdf
10-25-14 146623  Optimizing Output Filters For Class D Audio Amplifiers.PDF
10-12-14 116299  Output-Filter Optimization For Class-D Audio Amplifiers .PDF
10-05-14 116299  Output-Filter Optimization for Class-D Audio Amplifiers .PDF
10-21-14 1918976  PCM-PWM Conversion with feedback power buffer.pdf
10-22-14 1918976  Pcm-Pwm Conversion With Feedback Power Buffer.pdf
10-22-14 2576384  Philips Class D Amplifier Solutions.pdf
10-24-14 104374  Philips TDA1562Q_Class-H Amplifier.pdf
10-25-14 104374  Philips Tda1562Q Class-H Amplifier.PDF
10-10-14 113835  Philips Ucd Application Note Um10155 1.pdf
10-24-14 17386  Power Amp - Class-D - 100 Watt.GIF
10-18-14 525312  Power Amp Paper.pdf
10-24-14 1081557  Power Amplifiers-Class D2.zip
10-24-14 20430  Power Amplifiers-Class_D_100W-12V.pdf
10-20-14 325379  Power Supply Considerations for Non Feedback Class D Power Amplifiers.pdf
10-09-14 892888  PowerPAD Layout Guidelines.pdf
10-25-14 8548  Proposed High Power Class-D Output Stage.GIF
10-25-14 163840  Pwm Circuit Uses One Op Amp.pdf
09-22-14 1310197  QFN Layout Guidelines.pdf
10-19-14 629084  RC Filter Box for Class-D Output Power and THD+N Measurement.pdf
10-16-14 553512  Reduce EMI from Class D Amplifiers Using New Modulation Techniques and Filter Architectures.mht
10-19-14 1936103  SG Class D amp chips.zip
10-13-14 1918976  STA120 Theory.pdf
10-25-14 6332  Self Oscillating Class D Amplifier 2.GIF
10-25-14 27386  Self Oscillating Class D Amplifier.GIF
10-24-14 13703  Self Oscillating Class D Amplifier.gif
10-22-14 36558  Self Oscillating Class D.ZIP
10-25-14 3086  Self Oscillating Pwm Modulator.GIF
10-25-14 12204  Single Supply H Bridge.PDF
10-25-14 1162512  Smpsu Amplifier.PDF
10-22-14 13659  Sorensen Amp Schematic21.PDF
10-22-14 14654  Sorensen Audio Class D Amp.PDF
10-22-14 13312  Sorenson Amp30.PDF
10-25-14 525312  Switch Mode Multi Level Power Amplifier.pdf
10-22-14 1163264  Switch Mode Power Amp.pdf
10-25-14 350304  TDA7293 120V - 100W DMOS AUDIO AMPLIFIER.pdf
10-25-14 99156  TDA8939_1.pdf
10-25-14 76040  TPA3101D2 Mono Amplifier Configuration.pdf
09-18-14 904314  TPA3120D2.pdf
10-25-14 434101  Tda7293 100W-8 Ohm.PDF
10-24-14 115477  Tda7482 25W Mono Class-D Amplifier.pdf
10-21-14 213515  Tda7490 25W + 25W Stereo Class-D Amplifier.pdf
10-21-14 241335  Testing DDX Digital Amplifers.pdf
10-20-14 241335  Testing Ddx Digital Amplifers.pdf
10-25-14 291796  Texas Class D Modulator Code Examples.pdf
10-25-14 511407  Thermal Considerations for a Class D Amplifier.mht
10-08-14 903356  Tripath3020 1.PDF
10-14-14 457847  Two AA Cells Produce Huge Audio Volume - Maxim.mht
10-21-14 88527  UCD Amplifier.pdf
10-20-14 23630  UCD2 Power Amp with HIP4081.pdf
10-24-14 281447  UcD and IMD, DIM, Slew Rate.pdf
10-16-14 58468  Voltage Gain of the UcD Modules.pdf
10-20-14 183395  Voltage Spike Measurement Technique and Specification.pdf
10-25-14 1108  WS_FTP.LOG
10-21-14 312203  What is a Class D Audio Amplifier by IR.pdf
10-24-14 300523  ZETEX 500W Subwoofer Amp.pdf
10-24-14 38848  a6rg2.jpg
10-25-14 15091  alpha.gif
10-25-14 32958  alpinedrive.gif
10-25-14 98423  class-d_amplifier_v1.1_schematics.zip
10-15-14 436  damp PIC Source files audampctrl1.zip
10-15-14 436  damp audampctrl1.zip
10-15-14 46497  filters_dos.zip
10-25-14 86992  hbmosfet.jpg
10-25-14 94440  hbridge.jpg
10-24-14 50471  interesting.jpg
10-24-14 63716  leapfrog3-4.pdf
10-15-14 41651  leapfrog5.pdf
10-22-14 23834  n-p_driver.pdf
10-25-14 47219  philips_ucd.png

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