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Amplifier Circuits:  Power Circuits
Power Amplifiers:  #'s - C        D - K        L - P         Q - S        T - Z

Amplifier -- Main Page

Last Updated: October 24, 2017 02:54 PM

Circuits Designed by Dave Johnson, P.E. :

Characteristics of CMOS Logic Inverter Amplifiers   -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers . . . Hobby Circuit designed by Dave Johnson P.E.-February 11, 2006

CMOS Logic Inverter Amplifier Characteristics   -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers . . . Circuit by David Johnson P.E.-February 11, 2006

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

Canary Sound Effect -  An electronic version of a chirping canary.  May be used as an alarm, a sound effects generator or perhaps a replacement doorbell __ Designed by Andy Collison

Capacitance Multiplier Power Supply for Class-A Amplifiers -  A basic circuit is provided in the article, but it is assumed that the builder knows all the pitfalls.  The supplied schematic is in fact for a capacitance multiplier filter   (not a regulator) , but is somewhat lacking   (I feel) and can be improved dramatically __ Designed by Rod Elliott  ESP

Chanting Player -  Chanting combines singing and music with mantras.  The sweetness of chanting stills the mind, dissolves worries and opens the heart.  Chanting forms an integral part of the practice schedule at siddha __ Electronics Projects for You

characteristics of CMOS Logic Inverter Amplifiers -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002

Chord EGG 2015: Remaking a PAiA Classic -  The Stereo Chord EGG was a novel little circuit introduced in kit form by PAiA in 1976 as an interesting application of a top octave generator IC.  This chip, which was state-of-the-art at the time, generated a whole octave plus one note (C8 to C9) on its 13 outputs from a single high frequency input (2MHz). __ Designed by Stefan Vorketter

Church Bell Controller -  This circuit is a church bell controller.  Basic component is an ATmega32 microcontroller.  At the circuit 2 24LC32 eeprom memories is being used, the 1st for internal standard melodies and the 2nd one is for user's compositions.  This feature will be provided in the future __ Designed by Antonis Pontikakis

Circuit diagram for 8 watt audio Amp -  Here is the schematic for an 8 watt audio amp.  This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp. __ Designed by Aaron Cake

Circuit Emulates Mechanical Metronome -  08/19/99 EDN-Design Ideas The circuit in Figure 1 produces timing signals with a sound like that of a mechanical metronome. IC 1 is a 555 timer that oscillates at approximately 3200 Hz.  The two 3-kW resistors and the 0.047-F capacitor set the frequency. IC 2 divIdeas the frequency of IC 1 's output by 2. IC 2 produces a square wave with an exact 50% duty cycle. __ Circuit Design by Jim Kocsis

Clamped AC-Input Video Cable Driver -  This circuit shows a means of driving composite video on standard 75Ω cable with just a single 3.3 V power supply.  This is possible due to the low output saturation levels of the LT6205 and the use of input clamping to optimize the bias point of the amplifi er for standard 1VP-P source video.  The circuit provides an active __ Linear Technology/Analog Devices App Note, Mar 25th 2010

Clara Guitar Amplifier -  Pure Class-A Single-ended circuitry; 2W Power, Valve-like operation __ Contact: Flavio Dellepiane, fladello @ tin.it

Class A2 SE 812A Amp -  This Amp is a variation on the SE 826 amp, below.  It uses positive grid bias derived directly from the cathode follower driver stage.  The 6F8-G driver/input tube was chosen because it biases to the required voltage (+14V) for the output stage's bias.  (Note that the 6F8-G can be replaced with a 6SN7.  I just happen to like the looks of the 6F8-G better) __ Designed by Bob Danielok

Class A2 SE 812A Amp power supply -  This is the power supply for a Class A2 812A Amp __ Designed by Bob Danielok

Class A2 SE 826 Amp -  The schematic for the SE 826 amp.  This Amp was an attempt to create a nice Class A2 power amp, similar to the SE 833 amps, described below, but without a 10:1 step-down transformer.  Instead, it uses a choke-loaded cathode follower to drive the output tube.  It uses positive grid bias derived directly from the cathode follower driver stage.  The 6F8-G driver/input tube was chosen because it biases to the required voltage (+14V) for the output stage's bias.  (Note that the 6F8-G can be replaced with a 6SN7.  I just happen to like the looks of the 6F8-G better) __ Designed by Bob Danielok

Class A2 SE 833 Stereo Amp -  The schematic for the SE 833A amp is shown HERE. __ Designed by Bob Danielok

Class A2 SE 833 Stereo Amp Power Supply -  The schematic for its power supply is shown HERE. __ Designed by Bob Danielok

Class A2 SE SV572-160 Stereo Amp -  This amp uses a 6BM8 drive stage similar to the big 833A amp below, except it utilizes CATHODE drive.  I presently have this amplifier set up so i can adjust the grid bias from about +2V to +30V.  There is also a switch that connects the output tube grids to ground (0 Bias) instead of the grid bias supply.  This way i can experiment with various output tubes, including 811A, 812A, SV572-10, SV572-30, SV811-10, etc.  So far, i think the SV572-160 sounds best in this amp.  I think it is because of the cathode drive (also called grounded grid) topology.  I think i like the medium mu transmiting tubes, like 812A, 826, SV572-30 in grid drive amplifiers better.  But in this amp, the 572-160 can be "dialed in" to a nice sweet-spot that sounds great! __ Designed by Bob Danielok

Class A2 SE826 power supply -  The schematic for the power supply __ Designed by Bob Danielok

Class-A Power Amplifier using MJE2955, TIP2955 or TIP36 for output stage -  A single-ended Class-A amplifier is essentially one where there is only one active driven output device.  The passive "load" may be a resistor, an inductor   (or transformer) oras in this amplifiera current sink.  Of the three basic options, the current sink offers the highest linearity for the lowest cost, so is the ideal choice.  Some esoteric   (some might say idiosyncratic) designs use inductors or 1:1 transformers, but these are bulky and very expensive.  Unless made to the utmost standards of construction, they will invariably have a negative effect on the sound quality, since the losses are frequency dependent and non-linear. __ Designed by Rod Elliott  ESP

Closer look at the FET booster based on a vintage Fender 12AX7 input stage. -  In the two years since the Fetzer Valve was first published in the midst of our adaptation of tube amps for use as distortion pedals, the circuit has enjoyed popularity as a standalone booster and as a building block in larger circuits.  While the circuit has its merits, we decided to further explore it to determine if it was a truly faithful solid-state version of the familiar input stage used in many tube amps. __ Contact: holler @ runoffgroove.Com

CMOS Inverter VCO tunes octave to UHF -  11/19/98 EDN-Design Ideas NOTE :  File contain several designs.  Scroll to find this one.  A robust and versatile vco provIdeas a stable output to 300 MHz (Figure 1).  The circuit's simplicity, unconditional stability, and consistent high-drive capability over an octave make the oscillator ideal for many applications, such as synthesized sources, local oscillators, and transmitters.  The AHC logic family (Texas Instruments, www.ti.com) makes the circuit's performance possible.  AHC is a relatively new line of CMOS logic whose high speeds and good noise performance allow oscillator operation into regions in which bipolar-junction-transistor and FET designs prevail. __ Circuit Design by Shawn Stafford, AM Communications Inc, Quakertown, PA  

CMOS Logic Inverter Amplifier characteristics -  This chart shows some of the measured characteristics of three different unbuffered CMOS logic gates, used as voltage amplifiers. . . Circuit by David Johnson P.E.-February, 2002

Colour Organ -  Three Lamp-Channels OutputBuilt-in Electret Microphone __ Contact: Flavio Dellepiane, fladello @ tin.it

Colour Organ based on a PIC16F84 microcontroller including Schematics & source code -  PIC Project  This unit uses a PIC16F84 with an 8 bit A/D.    The signal from both stereo channels is combined and digitized.    Each of 5 frequency bands is processed using a 16 point FFT.    Then the level of each channel is output as PWM (pulse width modulation) to a set of solid state relays __ Designed by Luhan MonatMesa Arizona

Compact DJ station -  Two Phono/Line switchable inputs; Powered by 9V Battery or external supply Adaptor __ Contact: Flavio Dellepiane, fladello @ tin.it

Composite Amp Provides High Gain & Bandwidth -  04/28/94 EDN-Design Ideas The composite circuit in Fig 1 couples the output drive and slew rate of a current-feedback amplifier, IC2, with the low-noise and low-offset characteristics of a voltage-feedback operational amplifier, IC1.  The circuit achieves gains as high as 1000, while showing little variation in frequency characteristics with gain.  This circuit suits applications/ __ Circuit Design by Mark Sauerwald, Comlinear Corp, Ft Collins, CO

Compressor/Limiter/Clipper for FM Broadcasting -  Audio signals as music or speech have big dynamic ranges.  There are silent and loud sections.  These audio signals aren't too good for a transmitter, which requires audio signal with constant level on the input.  Limiter is a device, __   Jan Kolar

Condor CAB Sim -  A professional-quality 4x10 open-back speaker cabinet simulator. __ Contact: holler @ runoffgroove.Com

Constant Q Expandable Graphic Equaliser -  Constant Q design.  Can be made using as many or as few sections as needed __ Designed by Rod Elliott  ESP

Convertible Single Ended SV572-30/3 Stereo Amp -  This project makes use of at least two of the new SV572 series audio power triodes from Svetlana.  This series includes the SV572-3 , SV572-10 , SV572-30 , and SV572-160.  The circuit topology is easily re-configurable ("convertible") to use either the -30 (in Class A2Zero Bias operation) or -3 (in Class A1 operation).  In addition, the -30 can be configured for two different drive schemes (standard grid driven configuration or Cathode Driven.  A set of switches are used to reconfigure (with power off).  But for clarity, the schematics are re-drawn for each mode as shown below __ Designed by Bob Danielak

Converting a PCS Power Amplifier to 13cm Ham Radio Band -  Schematic only, no circuit description __ Designed by 2001YO5OFH, Csaba Gajdos

CPLD automatically powers itself off -  04/13/06  EDN-Design Ideas Add a few discrete components to a CPLD to implement a battery-powered system's power-down circuit __ Circuit Design by Rafael Camarota, Altera Corp, San Jose, CA

CPLD autonomously powers battery-powered systE - M -  12-Apr-07 EDN-Design Ideas CPLD controls power-on and off of intermittent-battery-powered system __ Circuit Design by Rafael Camarota, Altera Corp, San Jose, CA

Current Feedback Amp -  The amplifier shown here was previously incorrectly referred to as 'El-Cheapo'.  Thanks to a reader who had a copy of the original 1964 article, it was immediately obvious that my recollection was flawed in the extreme. __ Designed by Rod Elliott  ESP

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