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Amplifier Circuits:  Variable Gain, Page 1
Variable Gain Amplifiers:  #'s - A      B - F      G - O      P - Z
Amplifier -- Main Page

Last Updated on: Thursday, April 07, 2016 01:00 PM
 

Circuits Designed by Dave Johnson, P.E. :
  • 0VAC to 280VAC Variable Isolated AC Voltage  -  I designed and built this circuit about 25 years ago. It came in handy for many projects that were powered from 120 VAC, 240 VAC and 277 VAC. It provides complete isolation from the power line. It uses two 1:1 isolation transformers that are wired in parallel . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/08/00]

  • Variable Isolated AC Voltage Spans 0Vac to 280Vac  -  I designed and built this circuit about 25 years ago. It came in handy for many projects that were powered from 120 VAC, 240 VAC and 277 VAC. It provides complete isolation from the power line. It uses two 1:1 isolation transformers that are wired in parallel . . . [Circuit by Dave Johnson P.E.,  07/09/00]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

0A to 2A Current Source -  The LT1995 Amplifies the sense resistor drop by 5V/V and subtracts that from VIN, providing an error signal to an LT1880 integrator. The integrated error drives the PMOSFET as required to deliver the commanded current. … [Linear Technology App Note - , Mar 31, 2010]

 

0VAC to 280VAC Variable Isolated AC Voltage -  I designed and built this circuit about 25 years ago. It came in handy for many projects that were powered from 120 VAC, 240 VAC and 277 VAC. It provides complete isolation from the power line. It uses two 1:1 isolation transformers that are wired in parallel . . . [Hobby Circuit designed by Dave Johnson P.E.,  07/08/00]

 

1 IC Provides Gains of 10 and –10 -  08/07/03  EDN Design Idea   Real-world data-acquisition systems require Amplifying weak signals to match the full-scale input range of an A/D converter. Unfortunately, when you configure them as gain blocks, most common Amplifiers have both gain errors and off… [by Moshe Gerstenhaber and Charles Kitchin, Analog Devices, Wilmington, MA]

 1A Variable Regulated Power Supply -  A 'must-have' for the experimenter.  (electronic design 05/09) … [from Peter Parker's website]

 

2.x GHz WiMAX Direct Conversion Transmitter -  AN-826 Analog Devices App Note -   …

 

4-20 mA Digital-to-Process Current Transmitter -  AN-21 Analog Devices App Note -  Describes a 3 I.C. Digital to 4-20 mA Current Output Circuit (DAC08, REF01 and OP221) …

 

A 2.x GHz WiMAX Direct Conversion Transmitter -  AN-826 Analog Devices App Note -   …

 

A Collection of Amp Applications -  AN-106 Analog Devices App Note -  Examines Some of  Numerous and Widely Used Applications of  Operational Amplifier…

 

A Digitally Programmable Gain & Attenuation Amplifier Design -  AN-137 Analog Devices App Notes  …

 

A User's Guide to I.C. Instrumentation Amplifiers -  AN-244 Analog Devices App Note -   …

 

AB-113: Precision Ramp Generator -  AB-113 Analog Devices App Notes  …

 

Adjustable-Gain Difference Amplifier Circuit Measures Hundreds of Volts, Rejects Large Common-Mode Signals -  Analog Devices-Analog Dialogue… [by Gerstenhaber, Moshe and O'Sullivan, Michael]

 

AN-106: A Collection of Amp Applications -  AN-106 Analog Devices App Notes Examines Some of  Numerous and Widely Used Applications of  Operational Amplifier…

 

AN-108: JFET-Input Amps are Unrivaled for Speed & Accuracy -  AN-108 Analog Devices App Notes  …

 

AN-117: OP-42 Advanced SPICE Macro-Model -  AN-117 Analog Devices App Notes  …

 

AN-120: OP400 SPICE Macro-Model -  AN-120 Analog Devices App Note -   …

 

AN-132: OP470 SPICE Macro-Model -  AN-132 Analog Devices App Note -   …

 

AN-137: A Digitally Programmable Gain & Attenuation Amplifier Design -  AN-137 Analog Devices App Note -   …

 

AN-138: SPICE-Compatible Op Amp Macro-Models -  AN-138 Analog Devices App Note -   …

 

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Variable Gain Amplifiers:  #'s - A      B - F      G - O      P - Z


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