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Party Line Intercom : (diagram added 6/03) |
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Phonograph Disc Playback PreAmplifier : (diagram added 6/03) |
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Phonograph Disc Record Amplifier : (diagram added 6/03) |
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Piecewise Linear Amplifier Eschews Diodes: 10/12/95 EDN-Design Ideas / (added 4/02) |
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Portable Mixer for Nagra Recorder : (diagram added 6/03) |
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Power Amplifier has Transient Rail-to-Rail Swing: 09/29/94 EDN-Design Ideas / (added 6/06) Has transient
rail-to-rail swing special common-drain MOSFET-based power op amp circuit |
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Predicting Op Amp Slew Rate Limited Response: National Semiconductor Application Note (app
note added 2/06) |
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Program designs single supply op amp circuits: 10/26/95 EDN-Design Ideas / (added 6/06)
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Pushing Low Quiescent Power Op Amps to Greater Than 55dbm 2-Tone Intercept: National Semiconductor
Application Note (app note added 2/06) |
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PWM Circuit uses One Opamp: 07)/06/00 EDN-Design Ideas / (added 5/03) circuit delivers a rectangular
signal with duty cycle varying between0 and100% in response to an input signal varying from0 to5V dc |
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Rail-To-Rail Amplifiers Operate on 2.7V with 20µV Offset: DN230 Design Notes (Linear
Technology) (app note added 1/06) |
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Rail-To-Rail I/O and 2.4V Operation Allow Ultrafast Comparators to Be Used on Low Voltage Supplies:
DN248 Design Notes (Linear Technology) (app note added 1/06) |
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Rail-to-Rail Op Amp Provides Biasing in RF Amp: 01/20/00 EDN-Design Ideas / (added 11/05)
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Rail-to-Rail Voltage Comparator: Circuit Ideas for Designers Application Notes Advanced Linear Devices,
Inc. (app note added 6/06) |
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Rail-to-Rail Voltage Comparator-23007.0: Circuit Ideas for Designers Application Notes Advanced Linear
Devices, Inc. (app note added 6/06) |
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Rail-to-Rail Voltage Follower/Buffer: Circuit Ideas for Designers Application Notes Advanced Linear
Devices, Inc. (app note added 6/06) |
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Rail-to-Rail Window Comparator-23008.0: Circuit Ideas for Designers Application Notes Advanced Linear
Devices, Inc. (app note added 6/06) |
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Reducing DC Errors in Op Amps (Addendum to AN241 and 242): National Semiconductor Application Note
(app note added 2/06) |
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RF Oscillator uses Current Feedback Op Amp: 10/03/02 EDN Design Ideas / (added 12/04) A
current-feedback amplifier is a well-known component with many uses. Its basic block diagram shows that its input stage is a voltage follower—in practice, a symmetrical emitter follower
(Figure 1). The configuration samples the output current, converts it to voltage across a large impedance, and amplifies it to the output using a high-power, low-output-impedance
amplifier.... |
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Selecting Op Amps for Precision 16-Bit DACs: DN214 Design Notes (Linear Technology)
(app note added 1/06) |
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Settling Time of Operational Amplifiers: AN-359 Analog Devices Application Notes (app note added
6/06) |
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Simple Differential Front-End for the LTC2400 Simple Rail-To-Rail Circuit Converts Differential
Signals to Single-Ended Signals and Operates on Single or Dual Supplies Where Resolution is More Important Than Accuracy: Design Solutions 2 Design Notes (Linear
Technology) (app note added 1/06) |
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Simple Op Amp Radio (ourworld): (electronic circuit added 7/03) |
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Simple Op-Amp Radio: This is basically a crystal radio with an audio amplifier which is fairly sensitive and receives
several strong stations in the Los Angeles area with a minimal 15 foot antenna. Longer antennas will provide a stronger signal but the selectivity will be worse and strong stations may be
heard in the background of weaker ones. Using a long wire antenna, the selectivity can be improved by connecting it to one of the taps on the coil instead of the junction of the capacitor
and coil.... (added 2/07) |
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Simple Timer Exploits Opamp Bias Current: 07)/21/94 EDN-Design Ideas / (added 5/03) The simple, low-cost
analog timer in Fig 1 exploits the parasitic input-bias current of op-amp IC1. The timer achieves long time delays even though it uses only low-value, inexpensive ceramic chip capacitors.
After all, because the input-bias current is the minimum current flow into an op amp, this method produces the longest time delays possible from a given capacitor and op amp....
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Simplified Test Set for Op Amp Characterization: National Semiconductor Application Note (app
note added 2/06) |
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Simulation SPICE Models for Comlinear's Op Amps: National Semiconductor Application Note (app
note added 2/06) |
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Single NiCd Cell Drives Opamp: 12/05/96 EDN-Design Ideas / (added 5/03)
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Single Op-Amp Bandpass Filter: A bandpass filter passes a range of frequencies while rejecting frequencies outside the
upper and lower limits of the passband. The range of frequencies to be passed is called the passband and.... (added 2/07) |
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Single Polarity Powe Supply Circuit for 400 Series Amplifiers : (diagram added 6/03) |
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Slow Opamp Makes Fast Multivibrator: 01/01/98 EDN-Design Ideas / (added 5/03) |
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SOT-23 Micropower Rail-to-Rail Op Amps Operate with Inputs Above the Positive Supply: DN221 Design
Notes (Linear Technology) (app note added 1/06) |
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SOT23-6 Op Amp Evaluation Board: National Semiconductor Application Note (app note added 2/06) |
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Source Resistance Induced Distortion in Op Amps: DN84 Design Notes (Linear Technology) (app note
added 1/06) |
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Specifying Selected Op Amps and Comparators: National Semiconductor Application Note (app note
added 2/06) |
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SPICE-Compatible Op Amp Macro-Models: AN-138 Analog Devices Application Notes (app note added 6/06) |
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Stability Analysis of Current Feedback Amplifiers: National Semiconductor Application Note
(app note added 2/06) |
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Swopamp Makes Square Wave Generator: 02/15/96 EDN-Design Ideas / (added 5/03)
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Synchronous Modulator: This unique circuit uses a very small amount of battery current and has excellent
carrier suppression. Its only shortcoming is that you must limit the input signal to 0.7 Vp-p in order to prevent distortion. To use higher input voltages, replace Q3 with a JFET. A MOSFET
doesn’t do as well as an NPN transistor.
Designed by Andrew R. Morris
(added 09/05) |
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Synchronous Modulator-1: This is an OpAmp version of the synchronous modulator I submitted earlier. It has
more consistent performance over varying power supply voltage than the discrete version, but it still has the 0.7 Vp-p limitation on the maximum input voltage. You should use a JFET or a
CMOS switch in place of Q1 if you need to accommodate a higher input voltage. Also, a low pass filter needs to be added after the output of this circuit, where the discrete version had one
built in.
Designed by Andrew R. Morris
(added 09/05) |