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Amplifiers: Buffer Circuits
Amplifier -- Main Page

Buffer Amplifier Circuits:  #'s - C         D - Z
 

Last Updated: November 30, 2017 07:37 AM

 
Circuits Designed by Dave Johnson, P.E. :

Buffer Amplifier Circuits

Dave's Amplifier Circuits:      Audio       Buffers       
 High Frequency-High Speed-Wide Band   High Impedance Circuits     
Low Noise      RF (Radio Frequency)     Variable Gain  

Flashing LED Advertising Badge #1 -  I have seen numerous flashing light badges at trade shows and conventions.  They are often handed out as gifts to promote some business.  The devices often use inefficient circuits, which cause the battery power source to be quickly depleted . . . Hobby Circuit designed by David Johnson P.E.-March 26, 2002

Form Push-Pull Driver using N-Ch & P-Ch Transistors  -  This circuit can produce high speed output signals with fast rise and full times.  The unique change pump action allows the voltage of the upper P-ch device to range from millivolts to hundreds of volts.  The output current is only limited by the rating of . . . Hobby Circuit designed by David A. Johnson P.E.-June 27, 2000

High Impedance JFET Buffers -  I have used these circuits many times.  They are great when you need a low gain AC signal amplifier with a very high input impedance.  It is good to beyond 50MHz . . . Hobby Circuit designed by Dave Johnson P.E.-July 11, 2006

Inductive Pulse Receiver (175Khz) -  This circuit is discussed in more detail in the Experimenters Journal. The receiverís six inch diameter coil detects the ring signal from the above transmitter and use a single NPN transistor to provided enough amplification for the signal to be easily viewed on an oscilloscope . . . Hobby Circuit designed by Dave Johnson P.E.-July 9, 2006

JFET High Impedance Buffers -  I have used these circuits many times.  They are great when you need a low gain AC signal amplifier with a very high input impedance.  It is good to beyond 50MHz . . . Circuit by Dave Johnson P.E.-July 11, 2006

LED Flashing Badge #1 -  I have seen numerous flashing light badges at trade shows and conventions.  They are often handed out as gifts to promote some business.  The devices often use inefficient circuits, which cause the battery power source to be quickly depleted . . . Circuit by David A. Johnson P.E.-March 26, 2002

LED Flashing Badge #2 -  This circuit uses a CD4013 dual D Flip/Flop IC .  A single lithium battery will provide months of continuous LED flashing.  It also has a tiny push-button switch to turn on and off the light flashing . . . Circuit by Dave Johnson P.E.-March 26, 2002

JFET High Impedance Buffers -  I have used these circuits many times.  They are great when you need a low gain AC signal amplifier with a very high input impedance.  It is good to beyond 50MHz . . . Circuit by Dave Johnson P.E.-July 11, 2006

LED Flashing Badge #1 -  I have seen numerous flashing light badges at trade shows and conventions.  They are often handed out as gifts to promote some business.  The devices often use inefficient circuits, which cause the battery power source to be quickly depleted . . . Circuit by David A. Johnson P.E.-March 26, 2002

LED Flashing Badge #2 -  This circuit uses a CD4013 dual D Flip/Flop IC .  A single lithium battery will provide months of continuous LED flashing.  It also has a tiny push-button switch to turn on and off the light flashing . . . Circuit by Dave Johnson P.E.-March 26, 2002

N-Ch & P-Ch Transistor Form Push-Pull Driver -  This circuit can produce high speed output signals with fast rise and full times.  The unique change pump action allows the voltage of the upper P-ch device to range from millivolts to hundreds of volts.  The output current is only limited by the rating of . . . Circuit by David A. Johnson P.E.-June 27, 2000

 

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

Diode-Connected EPAD MOSFET with Buffer Amplifier Output -  Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc

Envelope follower combines fast response, low ripple -  12/26/02 EDN Design Ideas:  Envelope followers extract amplitude information from complex audio waveforms.  The resulting dc voltage often drives nonlinear stages, such as voltage-controlled amplifiers or filters.  You must make a careful trade-off between the speed of response to a rapidly changing input signal and the amount of ripple in the dc output that you can tolerate __ Circuit Design by Harry Bissell, Royal Oak, MI

Flashing LED Advertising Badge #1 -  I have seen numerous flashing light badges at trade shows and conventions.  They are often handed out as gifts to promote some business.  The devices often use inefficient circuits, which cause the battery power source to be quickly depleted . . . Hobby Circuit designed by David Johnson P.E.-March, 2002

Follow the Debouncing flip-flops -  02/17/00 EDN Design Ideas:  During a recent development effort, we could not find literature detailing how to debounce an spst momentary switch using only logic (no capacitors, Schmitt triggers, or other components).  Our application placed the spst switches several feet from the logic board, and both noisy switches and line transients caused false triggers.      __ Circuit Design by Ray Scott

Form Push-Pull Driver using N-Ch & P-Ch Transistors  -  This circuit can produce high speed output signals with fast rise and full times.  The unique change pump action allows the voltage of the upper P-ch device to range from millivolts to hundreds of volts.  The output current is only limited by the rating of . . . Hobby Circuit designed by David A. Johnson P.E.-June, 2000

High Impedance JFET Buffers -  I have used these circuits many times.  They are great when you need a low gain AC signal amplifier with a very high input impedance.  It is good to beyond 50MHz . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

High Input Impedance Source follower -  Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc

High-Impedance Buffer Amplifier's Input includes ESD Protection -  09/28/06 EDN Design Ideas:  Diodes and guard traces suppress high-voltage static-discharge transients __ Circuit Design by Eugene Palatnik, Waukesha, WI; Edited by Brad Thompson and Fran Granville - September 28, 2006

Inductive Pulse Receiver (175Khz) -  This circuit is discussed in more detail in the Experimenters Journal. The receiverís six inch diameter coil detects the ring signal from the above transmitter and use a single NPN transistor to provided enough amplification for the signal to be easily viewed on an oscilloscope . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

JFET High Impedance Buffers -  I have used these circuits many times.  They are great when you need a low gain AC signal amplifier with a very high input impedance.  It is good to beyond 50MHz . . . Circuit by Dave Johnson P.E.-July, 2006

LED Flashing Badge #1 -  I have seen numerous flashing light badges at trade shows and conventions.  They are often handed out as gifts to promote some business.  The devices often use inefficient circuits, which cause the battery power source to be quickly depleted . . . Circuit by David A. Johnson P.E.-March, 2002

LED Flashing Badge #2 -  This circuit uses a CD4013 dual D Flip/Flop IC .  A single lithium battery will provide months of continuous LED flashing.  It also has a tiny push-button switch to turn on and off the light flashing . . . Circuit by Dave Johnson P.E.-March, 2002

Level Shifter Follows Negative Output -  11/23/94 EDN Design Ideas:  Transistors Q1 and Q2 in Fig 1, develop a feedback signal of the proper positive polarity for regulator IC 1 from the circuit's negative output.  You can use this simple technique to sense any negative-voltage output __ Circuit Design by Dimitry Goder, Linear Technology Corp, Milpitas, CA

Low-Distortion Discrete Buffer Amplifier Handles Bipolar Signals -  11/30/12  EDN Design Ideas:  Sometimes, the need arises for a low-distortion buffer amplifier capable of handling bipolar signals.  Sometimes, the need arises for a low-distortion buffer amplifier capable of handling bipolar signals.  You can use an op amp or integrated buffer for these applications, but for more flexibility, a discrete design may prove useful.  Applications include buffering the input of an ADC or the output of a DAC, or an audio line driver. __ Circuit Design by Peter Demchenko, Vilnius, Lithuania

Low-Noise (1.5nV/√Hz) fully differential 1.6GHz buffer drives 50Ohm load -  08/19/12  EDN Product Brief   The LTC6417 from is a fully differential buffer amplifier with only 1.5nV/√Hz output-referred noise.  The LTC6417 from is a fully differential buffer amplifier with only 1.5nV/√Hz output-referred noise.  The LTC6417 is capable of driving a differential 50Ohm load and is optimized for driving 14- and 16-bit pipeline ADCs.  It can be DC- or AC-coupled at its inputs, and achieves excellent distortion performance for signals up to and beyond 600MHz.  At 140MHz, OiP3 is 46dBm, and HD3 is -69dBc with 2.4 VP-P output swing into a 50Ohm load.   __ Circuit Design by LTC6417 from Linear Technology

Micropower Buffered Rail-to-Rail Adjustable Volatge Source -  Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc

Micropower Buffered Variable Voltage Source -  Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc

N-Ch & P-Ch Transistor Form Push-Pull Driver -  This circuit can produce high speed output signals with fast rise and full times.  The unique change pump action allows the voltage of the upper P-ch device to range from millivolts to hundreds of volts.  The output current is only limited by the rating of . . . Circuit by David A. Johnson P.E.-June, 2000

New Power Buffer Application -  Linear Technology AN4 __ Designed by Jim Williams - Sep 23rd, 1984

Noise Trap for Long Servo Leads -  The input signal (pulse) from the receiver is introduced at pin 1 of the CMOS chip MC14069UB and come out at pin 2 inverted, gets put back on pin 3 of the second buffer, and gets out on pin 4 inverted again. __ Designed by Tony van Roon  VA3AVR

On/off buffer switches analog or digital signals -  30-Mar-06 EDN Design Ideas:  Use an op amp and a dual SPST to switch signals under digital control __ Circuit Design by Liviu Pascu, Kepco, Flushing, NY

One Resistor Betters Inexpensive Buffer -  07/07/94 EDN Design Ideas:  Differential gain and phase are important video characteristics, and video-equipment manufacturers welcome any low-cost method of improving these parameters.  Fig 1 shows one simple method using a low-power, low-cost, closed-loop buffer with a total circuit __ Circuit Design by Jim Riphahn, Comlinear Corp, Fort Collins, CO

Peak to Peak 300v Signal Generator -  This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000

Push Button Switch Debouncer -  This circuit will remove the transient spikes and contact bounces from a non-latching push button switch.   __ Designed by Andy Collison

Rail-to-Rail Voltage follower/Buffer -  Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc

Resistor Betters Inexpensive Buffer -  07/07/94 EDN Design Ideas:  Differential gain and phase are important video characteristics, and video-equipment manufacturers welcome any low-cost method of improving these parameters.  Fig 1 shows one simple method using a low-power, low-cost, closed-loop buffer with a total circuit __ Circuit Design by Jim Riphahn, Comlinear Corp, Fort Collins, CO

RF Buffer Stage -  This buffers tage is intended to be used after a BF900 or BF199 (even a BF245) oscillator.  It delivers several milliwatts and is perfect to drive a 2N2219 or 2N4427.  Be sure the coils are really round and can "see" each other: place metalplates between the coils.  The supply voltage is around 12V (typ.13, 8V).  __ 

Single Resistor Betters Inexpensive Buffer -  07/07/94 EDN Design Ideas:  Differential gain and phase are important video characteristics, and video-equipment manufacturers welcome any low-cost method of improving these parameters.  Fig 1 shows one simple method using a low-power, low-cost, closed-loop buffer with a total circuit __ Circuit Design by Jim Riphahn, Comlinear Corp, Fort Collins, CO

Switch Debouncer -  This circuit will remove the transient spikes and contact bounces from a non-latching push button switch.   __ Designed by Andy Collison

Universal Buffer -  A 2 stage audio pre-amplifier with very good performance.  This preamplifier has two direct-coupled common emitter stages and uses series-voltage feedback.  The circuit has high input impedance, low output impedance, voltage gain can be set independently and has low noise levels and good signal noise ratio.   __ Designed by Graham Maynard

Voltage follower with 1G ohm input resistance -  This is a new implementation of the AVR DDS signal generator v2.0, already published in scienceprog.  com.  It is obvious that full credit for the original schematic and the firmware goes to its original creator.  Presented here is a different PCB that is compact, single sided with only through-hole components for easy construction.   __ Designed by Vassilis Papanikolaou - vpapanik @ gmail.com




Buffer Amplifier Circuits:  #'s - C         D - Z


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