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Amplifiers: Audio Circuits
Amplifier -- Main Page          Audio Amplifiers Circuits -- Main Page

Buffer Amplifier Circuits:  Page 1,   Page 2,    Page 3
 

Last Updated: October 30, 2014 09:22 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)       
Transimpedance             Variable Gain      Current  to Voltage Converter

 

  • 300v Peak to Peak Signal Generator -  This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times…[Circuit designed by Dave Johnson P.E., 3/01/2002]
  • AC Current Indicator Light -  This circuit could be wired into a 120vac power line, which feeds power to any load, ranging from 40 watts to 250 watts.  It will turn on a LED light whenever current is being drawn by a load.  It is especially useful for remote lights, where you may not…[Hobby Circuit designed by Dave Johnson P.E., 2012]

  • AC Power Line High/Low Voltage Tester -  If you wish to test a line-powered device under both a 15% high and a 15% low voltage condition, you can use the circuit below.  The circuit uses an 18v transformer with a 3 amp rating.  A double pole, double throw toggle switch then switches in the…[Circuit designed by Dave Johnson P.E., 5/01/2005]

  • Active AC Power Line Indicator -  The circuit below is designed to detect when a power cable is active (hot) . When the flat sensor end of the device is held near an active AC line, the bright green LED on the top of the housing will glow.  It is powered by a 3v CR2032 lithium coin cell.  I…[Circuit designed by Dave Johnson P.E., 5/02/2005]

  • Advertising Badge with Flashing LED -  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 designed by David A. Johnson P.E., 1998]

  • Advertising Badge with Flashing LED-Version 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 designed by Dave Johnson P.E., 3/26/2002]

  • Battery-Powered LED Flashing Advertising -  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…[Hobby Circuit designed by David A. Johnson P.E., 4/05]

  • Bi-Directional Charge Coupled Powers MOSFET Relay -  The circuit uses an inexpensive C-MOS inverter package and a few small capacitors to drive two power MOS transistors from a 12v to 15v supply. Since the coupling capacitor values used to drive the FETs are small, the leakage current from the power line…[Hobby Circuit designed by David A. Johnson P.E., 1999]

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

300v Peak to Peak Signal Generator -  This circuit converts a square wave signal to a +-150 volt output signal with fast 100nS rise and fall times…[Circuit designed by Dave Johnson P.E., 3/01/2002]

50 Mhz, 250W Amplifier Using Push-Pull Arf448a/B -  Application Note Microsemi-formerly Advanced Power Technology APT9702A ...

750 MHz Power Doubler & Push-Pull CATV Hybird Modules Using Gallium Arsenide 3/21/96  -  Application Note California Eastern Laboratories Doc #920  ...

A 50 Mhz, 250W Amplifier Using Push-Pull Arf448a/B -  Application Note formerly Advanved Power Technology APT9702A...

A Push-Pull 300-watt Amplifier for 81.36 MHz -  This article describes a 300 watt amplifier for 81.  36 MHz using a push-pull pair of plastic packaged devices.  The design techniques and construction practices are described in enough detail to permit duplication of the amplifier.  Application Note Microsemi-formerly Advanced Power Technology APT9801...

AC Current Indicator Light -  This circuit could be wired into a 120vac power line, which feeds power to any load, ranging from 40 watts to 250 watts.  It will turn on a LED light whenever current is being drawn by a load.  It is especially useful for remote lights, where you may not…[Hobby Circuit designed by Dave Johnson P.E., 2012]

AC Power Line High/Low Voltage Tester -  If you wish to test a line-powered device under both a 15% high and a 15% low voltage condition, you can use the circuit below.  The circuit uses an 18v transformer with a 3 amp rating.  A double pole, double throw toggle switch then switches in the…[Circuit designed by Dave Johnson P.E., 5/01/2005]

Active AC Power Line Indicator -  The circuit below is designed to detect when a power cable is active (hot) . When the flat sensor end of the device is held near an active AC line, the bright green LED on the top of the housing will glow.  It is powered by a 3v CR2032 lithium coin cell.  I…[Circuit designed by Dave Johnson P.E., 5/02/2005]

Advertising Badge with Flashing LED -  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 designed by David A. Johnson P.E., 1998]

Advertising Badge with Flashing LED-Version 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 designed by Dave Johnson P.E., 3/26/2002]

AN-1111: an Introduction to IBIS -  National Semiconductor Application Note  I/O Buffer Information Specification Modeling  ...

AN-1222:AN-1222 Usbn9603/4: Increased Data Transfer Rate using Ping-Pong Buffering -  National Semiconductor Application Note  ...

AN-329: Implementing an 8-Bit Buffer in COPS -  National Semiconductor Application Note  ...

AN-581: Biasing & Decoupling Op Amps in Single Supply Applications -  AN-581 Analog Devices App Note  ...

AN-692: Universal Precision Op Amp Evaluation Board -  AN-692 Analog Devices App Note  ...

AN-772: A Design & Manufacturing Guide for the Lead Frame Chip Scale Package -  AN-772 Analog Devices App Note  ...

Applications of Wide-Band Buffer Amplifiers -  National Semiconductor Application Note  ...

Baby of Camel: All-directly-Heated Pushpull Amp-Spy Photos -  Project a Camel is a take-no-prisoners DHT PP based on Lynn Olson Aurora topology.  Unfortunately, I'm stuck waiting for Lundahl transformers (three monthsthat famous Nordic attention to detailone turn a day).  Well, before Camel is born, there was his baby, sans interstage transformers, yet with all DHT stages (all tubes from Svetlana 1970-s).  OK, the input/splitter... [klausmobile @ yahoo.Com]

Battery-Powered LED Flashing Advertising -  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…[Hobby Circuit designed by David A. Johnson P.E., 4/05]

Biasing & Decoupling Op Amps in Single Supply Applications -  AN-581 Analog Devices App Note  ...

Bi-Directional Charge Coupled Powers MOSFET Relay -  The circuit uses an inexpensive C-MOS inverter package and a few small capacitors to drive two power MOS transistors from a 12v to 15v supply. Since the coupling capacitor values used to drive the FETs are small, the leakage current from the power line…[Hobby Circuit designed by David A. Johnson P.E., 1999]

Buffer Amplifier -  Circuit designed by Graham Maynard.  A hifi preamplifier designed to convert high output impedance amplifiers to 600 ohm outputs... [by Graham Maynard]

Buffer amplifier and LED improve PWM power controller's low-load operation -  09/15/05  EDN Design Idea   PWM IC is enhanced with discrete components for wider-range operation... [by Gregory Mirsky, LaMarche Manufacturing Co, Des Plaines, IL]

Buffer switches analog or digital signals -  03/30/06  EDN Design Idea   Use an op amp and a dual SPST to switch signals under digital control... [by Liviu Pascu, Kepco, Flushing, NY]

Buffered Current Source -  Circuit Ideas for Designers App Note... [Advanced Linear Devices, Inc]

Buffers Stabilize Oscillator -  09/14/12  EDN Design Idea   Keep your oscillator frequency and amplitude constant with this easy fix.  ... [by Maxwell Strange, Goddard Space Flight Center, Greenbelt, MD]

Build a good Audio Buffer Amplifier -  Audio power amplifier circuit diagrams / circuit schematics...


Buffer Amplifier Circuits:  Page 1,   Page 2,    Page 3

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