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Settling Time of Operational Amplifiers - AN-359 Analog Devices Application Notes
(app note added 2/06) |
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Simple fixture statically tests programmable gain Amplifiers - 06/26/08 EDN-Design
Ideas: Using a simple fixture having a common ground point, you can statically test
digital gain-programmable amplifiers.....(design idea added 09/08) |
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Simple variable frequency oscillator - ….(circuit design added 03/08) |
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Simple Variable Voltage Source - The high current regulator below uses an
additional winding or a separate transformer to supply power for the LM317 regulator
so that the pass transistors can operate closer to saturation and improve efficiency.
For good efficiency the voltage at the collectors of the two parallel 2N3055 pass
transistors should be close to the output voltage. The LM317 requires a couple extra
volts on the input side, plus the emitter/base drop of the 3055s, plus whatever is
lost across the (0.1 ohm) equalizing resistors (1volt at 10 amps), so a separate
transformer and rectifier/filter circuit is used that is a few volts higher than the
output voltage..... (added 4/05) |
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Single IC Provides Gains of 10 And10 - 08/07/03 EDN-Design Ideas: 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 offset drift. The typical two-resistor
gain-setting.....(design idea added 1/05) |
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Single Resistor Controls Wien Bridge Oscillator Frequency - AB-112 Analog Devices
App Notes (app note added 2/06) Frequency control can be added to the conventional
Wien Bridge Circuit by adding an op amp inverter. |
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Single-Supply Wien Bridge Oscillator - Operational amplifier U1A, in conjunction
with the parallel and series RC legs, form a frequency determining network, while U1B,
Field Effect Transistor (FET) Q1, and associated components form an amplitude
regulating circuit that prevents the output waveform from saturating. The 0.1
microfarad capacitor...(added 05/08) |
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SPICE-Compatible Op Amp Macro-Models - AN-138 Analog Devices Application Notes
(app note added 2/06) |
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The Alexander Current-Feedback Audio Power Amplifier - AN-211 Analog Devices
Application Notes (app note added 2/06) |
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User's Guide to Applying & Measuring Operational Amplifier Specifications - AN-356
Analog Devices Application Notes (app note added 2/06) |
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User's Guide to I.C. Instrumentation Amplifiers - AN-244 Analog Devices
Application Notes (app note added 2/06) |
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Using the AD813X Differential Amplifier - AN-584 Analog Devices Application Notes
(app note added 2/06) The AD813x differs from conventional op amps by the external
presence of an additional input and output. The additional input, VOGM, controls the
output common mode voltage. |
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Variable Gain Control Produces Pure Sine Wave - 10/27/94 EDN-Design Ideas: The
circuit in Fig 1 delivers a pure, buffered, and level-controlled sine wave. With no
tuning requirements, the circuit works with all crystals up to about 30
MHz….....(design idea added 02/05) |
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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 for the140vac range and
in series for the 280vac range. The selector switch also diverts power to the
appropriate output socket to avoid mishaps in sending the wrong voltage to the load.
My home-built unit also included an AC volt and amp meter to monitor the output.
However, this circuit only indicates the AC power connections. ….(designed by David A.
Johnson) |
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Variable Voltage Regulator (Ron J) - As Ron suggests, controlling the output
voltage from a regulator can be made variable in three ways...(electronic design added
6/07) |
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Variable-gain stage uses voltage-output DAC - 08/01/97 EDN-Design Ideas: A
voltage-output DAC normally generates an output voltage that is a fraction of the
input-reference voltage. In many designs, however, it is necessary to multiply the
input voltage by a programmable gain, or, in other words, to create a variable-gain
stage. You can easily implement.....(design idea added 4/02) |
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Versatile Programmable Amplifiers using Digital Potentiometers with Nonvolatile Memory
- AN-579 Analog Devices Application Notes (app note added 2/06) |
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Video VCAs & Keyers using the AD834 & AD811 - AN-216 Analog Devices Application
Notes (app note added 2/06) |
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Ways to Optimize the Performance of a Difference Amplifier - AN-589 Analog Devices
Application Notes (app note added 2/06) This Application Note presents several ways
to build and optimize the performance of a discrete difference amplifier. It also
recommends amplifiers that will make the overall solution cost/performance competitive
with monolithic instrument amplifiers. |
