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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 Discrete Opamps
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Last Accessed Size  File
01-14-18 387924  3080 Circuits.pdf
01-04-18 4329  741peak.gif
01-15-18 79780  A Cookbook Approach to Single Supply DC-Coupled Op Amp Design.pdf
12-19-17 39011  AC COUPLING INSTRUMENTATION AND DIFFERENCE AMPLIFIERS.pdf
01-13-18 105232  Absolute_Value_Mancini.jpg
12-21-17 47207  Active Filter with D-A Converter control.pdf
01-09-18 114021  Adjustable Slew Rate Amplifier.pdf
01-14-18 50869  Analog Divider and Multiplier.pdf
12-24-17 271250  Analog Divider.pdf
12-21-17 1560100  Analog back to the future Part 1.pdf
12-22-17 238349  Audio Applications Of Linear Ics.pdf
12-16-17 330294  Avoiding Noise and Power Problems with Unused Op Amps.mht
12-19-17 953515  Avoiding Passive Component Pitfalls.pdf
12-19-17 224208  Bodywork Checker.pdf
12-24-17 22781  Broad-Band-Peak-detector-using-LM393.jpg
12-19-17 39727  Burr Brown Ac Coupling Instrumentation And Difference Amplifiers - Ina117 App Note.pdf
12-19-17 33089  CLASSICAL OP AMP OR CURRENT-FEEDBACK OP AMP.pdf
12-19-17 111783  Calculating Sum and Difference Networks.pdf
12-16-17 624596  Choosing Op Amps for DC Servo.mht
12-24-17 197880  Common Mode Voltage Cancelling Amplifier.pdf
12-19-17 314906  Controllable Inverting-NonInverting Circuit.pdf
12-26-17 73368  Controlling Opamp gain with one potentiometer.pdf
12-16-17 2714463  Current Amps and Feedback.mht
12-25-17 139250  Current Feedback Amplifier Do's & Don'ts.pdf
01-03-18 71477  Current Source Enables Op Amp's Output to go to Ground.pdf
12-09-17 21893  DOUBLE THE OUTPUT CURRENT TO A LOAD.pdf
12-20-17 49649  Dc Level Clamp.pdf
12-16-17 534241  Design Trade-Offs for Single-Supply Op Amps.mht
01-15-18 322527  Designing With Opamps.PDF
12-03-17 502603  Designing with monostable multivibrators.pdf
12-06-17 94427  Determining the Dynamic Range of Logarithmic Amplifiers.pdf
12-06-17 31475  Differential input & output circuit on a single supply.pdf
01-08-18 111466  Digitally Programmable Instrumentation Amplifier.pdf
01-12-18 89814  Dual Feedback Amplifier Zeros Comparitor Hysteresis.pdf
12-22-17 105727  Dual Op Amp Instrumentation Amp.pdf
01-13-18 378663  EPOT Applications Gain Adjustment in Op-Amp Circuits.mht
12-15-17 315051  Engineer's Stethoscope.pdf
12-23-17 205353  Feed it Forward.pdf
12-22-17 4256067  Feedback Amplifiers Commentary.pdf
12-07-17 20693  Feedforward Amplifier.pdf
12-15-17 477139  Flexible Gain Programmable Op-Amp.pdf
12-04-17 141189  Fully Differential Op Amps Made Easy.pdf
12-21-17 450093  Gas Monitor.pdf
01-12-18 73130  Get More Power Out of Dual or Quad Op-Amps.pdf
12-06-17 373433  Getting Started with Op-Amps.pdf
12-28-17 2103557  Handbook Of Op-Amp Apps.pdf
12-06-17 24546  High Input Impedance Integrator.pdf
12-03-17 16918  High Performance Audio Op-Amp Quick Reference.pdf
01-08-18 55512  High Quality Instrumentation Amplifier.pdf
01-07-18 5348029  High Speed Amplifier Techniques from Linear Technology.pdf
12-01-17 330334  High-Performance Audio Applications of the LM833.pdf
12-26-17 149482  Improved Clamping Amplifier.pdf
12-04-17 141029  Increasing opamp output voltage swing.pdf
12-23-17 283126  Integrators.pdf
01-13-18 453017  Interfacing LVDS.pdf
01-15-18 48167  LM324 Interface Circuits.pdf
11-30-17 118776  Level Shifter to Build a High Voltage Op-Amp.pdf
12-23-17 309618  Log Amps.pdf
12-22-17 56002  Low Cost Logarithmic Amplifier.pdf
01-07-18 16117  Low Drift Integrator.pdf
12-05-17 143525  Low Voltage Micropower Op-Amps.pdf
12-03-17 1068085  Measuring an Op-Amp's Real Time Offset Voltage.pdf
01-10-18 806659  Misc Op Amp Applications Part 4.pdf
12-06-17 12048  Monolithic Sample & Hold.pdf
12-06-17 81966  Multiplying Rc Time Constants With Op-Amps.pdf
12-23-17 202045  National Semiconductor Application Guide For Op Amps.pdf
12-07-17 303251  New Op Amp Ideas.pdf
12-24-17 37629  Obtaining Average Absolute Value.pdf
12-15-17 12166  One Diode Full Wave Rectifier.pdf
12-25-17 148581  One OpAmp Dual Limit Comparitor.pdf
12-28-17 176099  Op Amp Booster Designs.pdf
12-22-17 1012024  Op Amp Circuit Collection.pdf
11-28-17 226444  Op Amp Circuits.mht
01-14-18 186599  Op Amp Injection for Bode Analysis.pdf
01-13-18 202277  Op Amp Noise Analysis.pdf
12-23-17 178743  Op Amp Noise.pdf
12-15-17 68936  Op Amp Power Output Stage.pdf
01-08-18 2963988  Op Amps - Misc.pdf
01-08-18 2061665  Op Amps For Everyone.pdf
12-07-17 115607  Op Amps Quiz.mht
01-15-18 28012  Op Latch.zip
01-08-18 149216  Op amp Characteristics.mht
12-06-17 179622  Op amp Packages.mht
12-13-17 123561  Op amp Voltage Amplifiers.mht
12-24-17 2083840  Op amps for everyone design reference from TI.pdf
12-22-17 1760767  Op amps with capacitive loads.mht
12-15-17 203122  Op-Amp Audio Applications.pdf
12-15-17 985824  Op-Amp Circuit Collection.pdf
12-11-17 138451  Op-Amp Flip Flops.pdf
12-09-17 7730  Op-Amp Oscillator.pdf
12-05-17 157514  Op-Amps in Pre-Amps.pdf
11-09-17 2291841  Op-amps based full-wave rectifier___ - STMicroelectronics.mht
01-06-18 110486  Op275 Opamp.PDF
12-06-17 315692  Operational Amplifiers Glossary of Key Terms.mht
12-22-17 208651  Operational amplifier models Operational Amplifiers.mht
12-03-17 519401  Operational_Amplifiers_final.pdf
12-15-17 106358  Output Impedance Stuff Part 1.pdf
12-06-17 172723  PC300 - Quiz - Intro to Op Amps.mht
12-27-17 103072  PRECISION ABSOLUTE VALUE CIRCUITS.pdf
12-30-17 147335  PRECISION_ABSOLUTE_VALUE - Basic_Circuit - Circuit Diagram - SeekIC_com.mht
01-14-18 300087  Peak Detectors.pdf
01-16-18 62157  Philbrick Op Amp.jpg
12-18-17 249584  Polarity Indicator.pdf
12-19-17 11478  Precision Half-Wave Ac-Dc Converter.pdf
12-22-17 38111  Precision Rectifier.zip
12-08-17 11873  Precision Unity-Gain Half-Wave Rectifier.pdf
01-08-18 655554  Precision full wave rectifier circuit - HQEW_net.mht
12-03-17 85546  Program an Op Amp with a Solid State Resistor.pdf
12-09-17 66463  Programmable inverting - noninverting opamp.pdf
12-22-17 24410  Pulse Train Generator.pdf
01-15-18 163840  Pwm Circuit Uses One Op Amp.pdf
01-13-18 59087  Reducing Auto Zero Amplifier Noise.pdf
01-16-18 67901  Remotely Gain Switched Op Amps.pdf
01-08-18 151727  Resistive Feedback Circuits.pdf
01-15-18 145481  Resistor Free Instrumentation Amplifier.pdf
12-03-17 1730787  Resistors in the feedback of a buffer Ask why!.mht
12-23-17 1036809  Rolling Stone Issue 1000 Cover Guide.pdf
12-27-17 17105  Sample & Hold Circuits.pdf
01-05-18 1115508  Sample and Hold Circuits.pdf
12-22-17 671417  Selecting Video Opamps.pdf
01-09-18 29826  Simple Chopper.pdf
12-22-17 379923  Simple Spice Op-Amp Simulation.pdf
12-25-17 55869  Simple Temperature Regulator.pdf
12-05-17 17940  Single device window detector.pdf
01-16-18 153569  Single-supply op amp design.pdf
11-12-17 335382  Single-supply op amp forms noninverting level shifter - Maxim.mht
12-05-17 68944  Some Tips On Stabilizing Op-Amps.pdf
12-15-17 124435  Some Tips on Stabilizing Op-Amps (2).pdf
12-24-17 341734  Spare Op Amp Generates Its Own Regulated Negative Supply.mht
01-16-18 83410  Super Precise Precision Rectifier.pdf
12-16-17 124331  Supercharging the 709 Op Amp.pdf
12-20-17 1164004  Suspended Animation.pdf
12-22-17 338507  Temperature Stabilized Log Converter.pdf
12-09-17 425548  The 1537 VCA.pdf
01-04-18 78158  The Full-Wave Rectifier and Averaging Filter - Freecircuits_net.mht
12-08-17 207816  The Gyrator.pdf
12-24-17 124435  Tips On Stabilizing Op Amps.pdf
12-05-17 137506  Tl072 Opamp.PDF
01-15-18 1573936  Top questions on op amp power dissipation – Part 1.mht
01-13-18 83385  Trans-Impedance Amplifiers Noise Issues.pdf
12-03-17 81519  Transimpedance Amplifier Stability.pdf
01-02-18 35589  True RMS Detector.pdf
12-25-17 26132  Tube Op-Amp.jpg
12-18-17 74729  Tube Op-Amp.png
12-25-17 38497  Two Amplifier Integrator.pdf
12-06-17 829267  Understanding opamp input stages.mht
01-07-18 103828  Use The Lm358 Dual, Single Supply Op Amp.pdf
12-07-17 92337  Using Free Amplifiers.pdf
01-08-18 202501  Using supply bootstrapping to reduce distortion in op-amp circuits.pdf
12-22-17 107975  Variable Gain Precision Rectifier.pdf
12-22-17 62313  Very High Input Impedance Op-Amp Circuit.pdf
12-15-17 2173092  Voltage to Current Transactor.pdf
01-14-18 1503006  Working with OTAs.pdf
01-12-18 42478  Zero Crossing Detector.pdf
12-01-17 18725  circuit-peak-detector.jpg
12-07-17 1518  peak.gif
12-22-17 614  peak.jpg

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