Index of /Op-Amps & Comparitors/Opamps
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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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The bandwidth reset time is now set to 20 hours instead of a week. We hope this helps you get what you need without causing any problems with the site.


05/07/2008
new server -
this week, we've moved the website to a bigger faster server. we have doubled the weekly download limit to 20mb and are now allowing hot-linking, so more people can get the documents they're looking for. this new server is still relatively low cost, but is a bit more to pay for each month then the last server. we still need your donations to help with this. thank you all who have supported the site and community!!!


01/24/2008
upload files - upload.schematicsforfree.com If you have files you'd like to add to the site, we'd love to add them. Please don't upload anything illegal, harmful, or copyrighted. We will do our best to screen the files and put them online.


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Last Accessed Size  File
11-13-17 387924  3080 Circuits.pdf
11-14-17 4329  741peak.gif
11-14-17 79780  A Cookbook Approach to Single Supply DC-Coupled Op Amp Design.pdf
11-10-17 39011  AC COUPLING INSTRUMENTATION AND DIFFERENCE AMPLIFIERS.pdf
11-14-17 105232  Absolute_Value_Mancini.jpg
11-16-17 47207  Active Filter with D-A Converter control.pdf
11-08-17 114021  Adjustable Slew Rate Amplifier.pdf
11-14-17 50869  Analog Divider and Multiplier.pdf
11-15-17 271250  Analog Divider.pdf
11-14-17 1560100  Analog back to the future Part 1.pdf
11-12-17 238349  Audio Applications Of Linear Ics.pdf
11-14-17 330294  Avoiding Noise and Power Problems with Unused Op Amps.mht
11-17-17 953515  Avoiding Passive Component Pitfalls.pdf
11-13-17 224208  Bodywork Checker.pdf
11-13-17 22781  Broad-Band-Peak-detector-using-LM393.jpg
11-13-17 39727  Burr Brown Ac Coupling Instrumentation And Difference Amplifiers - Ina117 App Note.pdf
11-08-17 33089  CLASSICAL OP AMP OR CURRENT-FEEDBACK OP AMP.pdf
11-14-17 111783  Calculating Sum and Difference Networks.pdf
11-16-17 624596  Choosing Op Amps for DC Servo.mht
11-17-17 197880  Common Mode Voltage Cancelling Amplifier.pdf
11-16-17 314906  Controllable Inverting-NonInverting Circuit.pdf
11-17-17 73368  Controlling Opamp gain with one potentiometer.pdf
11-14-17 2714463  Current Amps and Feedback.mht
11-16-17 139250  Current Feedback Amplifier Do's & Don'ts.pdf
11-13-17 71477  Current Source Enables Op Amp's Output to go to Ground.pdf
11-13-17 21893  DOUBLE THE OUTPUT CURRENT TO A LOAD.pdf
11-08-17 49649  Dc Level Clamp.pdf
11-14-17 534241  Design Trade-Offs for Single-Supply Op Amps.mht
11-12-17 322527  Designing With Opamps.PDF
11-02-17 502603  Designing with monostable multivibrators.pdf
11-13-17 94427  Determining the Dynamic Range of Logarithmic Amplifiers.pdf
11-03-17 31475  Differential input & output circuit on a single supply.pdf
11-12-17 111466  Digitally Programmable Instrumentation Amplifier.pdf
11-10-17 89814  Dual Feedback Amplifier Zeros Comparitor Hysteresis.pdf
11-12-17 105727  Dual Op Amp Instrumentation Amp.pdf
11-10-17 378663  EPOT Applications Gain Adjustment in Op-Amp Circuits.mht
11-14-17 315051  Engineer's Stethoscope.pdf
11-14-17 205353  Feed it Forward.pdf
11-16-17 4256067  Feedback Amplifiers Commentary.pdf
11-13-17 20693  Feedforward Amplifier.pdf
11-16-17 141189  Fully Differential Op Amps Made Easy.pdf
11-08-17 450093  Gas Monitor.pdf
11-15-17 73130  Get More Power Out of Dual or Quad Op-Amps.pdf
11-16-17 373433  Getting Started with Op-Amps.pdf
11-07-17 2103557  Handbook Of Op-Amp Apps.pdf
11-17-17 24546  High Input Impedance Integrator.pdf
11-16-17 16918  High Performance Audio Op-Amp Quick Reference.pdf
11-16-17 55512  High Quality Instrumentation Amplifier.pdf
11-08-17 5348029  High Speed Amplifier Techniques from Linear Technology.pdf
11-16-17 330334  High-Performance Audio Applications of the LM833.pdf
11-17-17 149482  Improved Clamping Amplifier.pdf
11-16-17 141029  Increasing opamp output voltage swing.pdf
11-08-17 283126  Integrators.pdf
11-15-17 453017  Interfacing LVDS.pdf
11-13-17 48167  LM324 Interface Circuits.pdf
11-08-17 118776  Level Shifter to Build a High Voltage Op-Amp.pdf
11-08-17 309618  Log Amps.pdf
11-14-17 56002  Low Cost Logarithmic Amplifier.pdf
11-13-17 16117  Low Drift Integrator.pdf
11-08-17 143525  Low Voltage Micropower Op-Amps.pdf
10-26-17 1068085  Measuring an Op-Amp's Real Time Offset Voltage.pdf
11-16-17 806659  Misc Op Amp Applications Part 4.pdf
11-10-17 12048  Monolithic Sample & Hold.pdf
11-13-17 81966  Multiplying Rc Time Constants With Op-Amps.pdf
11-05-17 202045  National Semiconductor Application Guide For Op Amps.pdf
11-08-17 303251  New Op Amp Ideas.pdf
11-14-17 37629  Obtaining Average Absolute Value.pdf
11-16-17 12166  One Diode Full Wave Rectifier.pdf
11-16-17 148581  One OpAmp Dual Limit Comparitor.pdf
11-09-17 176099  Op Amp Booster Designs.pdf
11-13-17 1012024  Op Amp Circuit Collection.pdf
11-08-17 226444  Op Amp Circuits.mht
11-17-17 186599  Op Amp Injection for Bode Analysis.pdf
11-08-17 202277  Op Amp Noise Analysis.pdf
11-13-17 178743  Op Amp Noise.pdf
11-12-17 68936  Op Amp Power Output Stage.pdf
11-10-17 2963988  Op Amps - Misc.pdf
11-08-17 2061665  Op Amps For Everyone.pdf
11-14-17 115607  Op Amps Quiz.mht
11-11-17 28012  Op Latch.zip
11-09-17 149216  Op amp Characteristics.mht
11-11-17 179622  Op amp Packages.mht
11-09-17 123561  Op amp Voltage Amplifiers.mht
11-11-17 2083840  Op amps for everyone design reference from TI.pdf
11-09-17 1760767  Op amps with capacitive loads.mht
11-08-17 203122  Op-Amp Audio Applications.pdf
11-08-17 985824  Op-Amp Circuit Collection.pdf
11-10-17 138451  Op-Amp Flip Flops.pdf
11-01-17 7730  Op-Amp Oscillator.pdf
11-17-17 157514  Op-Amps in Pre-Amps.pdf
11-09-17 2291841  Op-amps based full-wave rectifier___ - STMicroelectronics.mht
11-12-17 110486  Op275 Opamp.PDF
11-11-17 315692  Operational Amplifiers Glossary of Key Terms.mht
11-14-17 208651  Operational amplifier models Operational Amplifiers.mht
11-08-17 519401  Operational_Amplifiers_final.pdf
11-08-17 106358  Output Impedance Stuff Part 1.pdf
11-12-17 172723  PC300 - Quiz - Intro to Op Amps.mht
11-15-17 103072  PRECISION ABSOLUTE VALUE CIRCUITS.pdf
11-14-17 147335  PRECISION_ABSOLUTE_VALUE - Basic_Circuit - Circuit Diagram - SeekIC_com.mht
11-17-17 300087  Peak Detectors.pdf
11-13-17 62157  Philbrick Op Amp.jpg
11-13-17 249584  Polarity Indicator.pdf
11-14-17 11478  Precision Half-Wave Ac-Dc Converter.pdf
11-11-17 38111  Precision Rectifier.zip
11-13-17 11873  Precision Unity-Gain Half-Wave Rectifier.pdf
11-09-17 655554  Precision full wave rectifier circuit - HQEW_net.mht
11-08-17 85546  Program an Op Amp with a Solid State Resistor.pdf
11-14-17 66463  Programmable inverting - noninverting opamp.pdf
11-05-17 24410  Pulse Train Generator.pdf
11-13-17 163840  Pwm Circuit Uses One Op Amp.pdf
11-16-17 59087  Reducing Auto Zero Amplifier Noise.pdf
11-14-17 67901  Remotely Gain Switched Op Amps.pdf
11-09-17 151727  Resistive Feedback Circuits.pdf
11-14-17 145481  Resistor Free Instrumentation Amplifier.pdf
11-14-17 1730787  Resistors in the feedback of a buffer Ask why!.mht
11-17-17 1036809  Rolling Stone Issue 1000 Cover Guide.pdf
11-12-17 17105  Sample & Hold Circuits.pdf
11-13-17 1115508  Sample and Hold Circuits.pdf
11-16-17 671417  Selecting Video Opamps.pdf
11-08-17 29826  Simple Chopper.pdf
11-10-17 379923  Simple Spice Op-Amp Simulation.pdf
11-05-17 55869  Simple Temperature Regulator.pdf
11-15-17 17940  Single device window detector.pdf
11-13-17 153569  Single-supply op amp design.pdf
11-12-17 335382  Single-supply op amp forms noninverting level shifter - Maxim.mht
11-08-17 68944  Some Tips On Stabilizing Op-Amps.pdf
11-16-17 341734  Spare Op Amp Generates Its Own Regulated Negative Supply.mht
11-17-17 83410  Super Precise Precision Rectifier.pdf
11-11-17 124331  Supercharging the 709 Op Amp.pdf
11-12-17 1164004  Suspended Animation.pdf
11-16-17 338507  Temperature Stabilized Log Converter.pdf
11-09-17 425548  The 1537 VCA.pdf
11-12-17 78158  The Full-Wave Rectifier and Averaging Filter - Freecircuits_net.mht
11-13-17 207816  The Gyrator.pdf
11-08-17 124435  Tips On Stabilizing Op Amps.pdf
11-13-17 137506  Tl072 Opamp.PDF
11-16-17 1573936  Top questions on op amp power dissipation – Part 1.mht
11-08-17 83385  Trans-Impedance Amplifiers Noise Issues.pdf
11-13-17 81519  Transimpedance Amplifier Stability.pdf
11-04-17 35589  True RMS Detector.pdf
11-15-17 26132  Tube Op-Amp.jpg
11-11-17 74729  Tube Op-Amp.png
11-14-17 38497  Two Amplifier Integrator.pdf
11-09-17 829267  Understanding opamp input stages.mht
11-15-17 103828  Use The Lm358 Dual, Single Supply Op Amp.pdf
11-16-17 92337  Using Free Amplifiers.pdf
11-08-17 202501  Using supply bootstrapping to reduce distortion in op-amp circuits.pdf
11-14-17 107975  Variable Gain Precision Rectifier.pdf
11-13-17 62313  Very High Input Impedance Op-Amp Circuit.pdf
11-11-17 1503006  Working with OTAs.pdf
11-16-17 42478  Zero Crossing Detector.pdf
10-17-17 18725  circuit-peak-detector.jpg
11-13-17 1518  peak.gif
11-12-17 614  peak.jpg

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