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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: November 30, 2017 10:27 AM

Circuits Designed by Dave Johnson, P.E. :
10mhz to 20mhz Laser Light Detector   -  This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system.  It has good ambient light immunity . . . Circuit by Dave Johnson P.E.-June 14, 2000

10Mhz to 20Mhz Light Receiver   -  Light power to volts conversion = APPROX.15mV per microwatt at 850nM . . . Circuit by David Johnson P.E.-July 11, 2006

120VAC Under Voltage Tester   -  Using a cheap 24vac transformer, this circuit can test a product under low 95vac conditions.    With the components show, it has a rating of 250 watts max.   . . . Circuit by David Johnson P.E.-July 11, 2006

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

µC generates musical sounds -  EDN-Design Ideas – April 15, 1999    [ NOTE : File has multiple design, scroll for this one.]  Many modern devices send audible signals to their operators to indicate some of the predetermined conditions or states of the system under control.  To avoid annoying human sensibilities, these sounds should match the musical scale.  Several chips on the market provide such sound capabilities; for example, a programmable sound generator or an ISD1016 voice messager.  The circuit in Figure 1 does not use a dedicated sound generator but rather generates sounds using software routines.  The circuit uses an inexpensive MC68H705J1A µC and saves additional expense by eliminating the need for a sound chip.  In Figure 2a, a note represents the pitch of each musical tone; Figure 2b shows the duration of the tone __ Circuit Design by Abel Raynus, Armatron International, Melrose, MA

1 Transistor Theremin This design is from a magazine called "Divirta-se com a Eletrônica", which translates to "have fun with electronics", and, indeed, is very fun.  For those who don't know what a Theremin is, it's one of the first synths ever made and it's named after his inventor, Mr.  Leon Theremin   (a Russian guy).  It's perhaps the only instrument which you don't actually touch: there's an antenna, and as the musician moves his hand near it, the pitch changes.  That's the thing Page used in "Whole Lotta Love"   (he used it with an echo, to get even weirder).  This circuit is a very simplified version of a Theremin, but is also very easy to build and really works!

1 Watt Class-C Amplifier -  schematic only, no circuit description __ Contact: Charles Wenzel of Wenzel Associates, Inc.

"The End" Power Audio Amp -  "The End" power amp is a construction found in a magazine, sorry I dont remember the name
So I did not invent eny of the electronics inside this box. __ Designed by Thomas Scherrer OZ2CPU

±120V Output Precision Op Amp -  Simple shunt regulators provide normal supply levels to the op amp and the external open-loop gain and buffer structure extends the output swing to nearly the high-voltage rails.  Output transistors are protected by current-limiting. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

1.5 W Power Amplifier type class-C -  This project explain how you can build and connect a powerful 1W amplifier to your FM transmitters __ Contact: maxit91 @ hotmail.com

1.5kW Power Amplifier -  Just the thing for those for whom no amount of power is enough __ Designed by Rod Elliott  ESP

10 meter (28MHz) band RF Amplifier -  If you elect to use an antenna tuner, it is extremely important that you understand exactly how to use tuners and what they can and cannot do.  A few watts of RF can easily become lost in an incorrectly adjusted antenna matching device.  The whole idea of a QRP station is to keep things simple and economical, so I cannot overemphasize the priority of a clean, efficient connection of the amplifier output to a resonant antenna. __ Designed by Guy Roels ON6MU

10 to one voltage divider for direct input -  Very simple DI-box idea for your guitar amp output

10 W Experimental Output & 1 Meter Loop Antenna for 187 kHz Lowfer  -  This page describes an antenna, a 1 watt final output stage, and a transformation network for radio experiments at 187 kHz __ Designed by Rod Elliott  ESP

10 Watt RMS Amplifier -  A Very Simple 12.5 Watt RMS Power Amplifier, into an 8 ohm load and with the op-amp driver.  This was the Maximum output before Clipping on the Oscilloscope, using an 8 Ohm Resistive load. __ Designed by G.L. Chemelec

100 Watt Amp -  Here is a simple and cheap amp to make.  I could have made the circuit board smaller but "what the heck" __ Designed by Jon Tirone, AKA John Fisher

100W Guitar Amplifier -  Guitar amplifiers are always an interesting challenge.  The tone controls, gain and overload characteristics are very individual, and the ideal combination varies from one guitarist to the next, and from one guitar to the next.  There is no amp that satisfies everyone's requirements, and this offering is not expected to be an exception __ Designed by Rod Elliott  ESP

100W HF QRO linear Amplifier with Motorola MRF454 -  100W HF Linear AmpSchematic only, no circuit description __ Designed by © 2001YO5OFH, Csaba Gajdos

100W RMS/Channel Stereo Amplifier-Part 3 -  Final article covers the assembly of the remaining modules and includes the full wiring and setting up details. __ SiliconChip

101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU -  Why would you want to interface the Keyboard? The IBM keyboard can be a cheap alternative to a keyboard on a Microprocessor development system.  Or maybe you want a remote terminal, just couple it with a LCD Module.  Maybe you have a RS-232 Barcode Scanner or other input devices, which you want to use with existing software which only allows you to key in numbers or letters.  You could design yourself a little box to convert RS-232 into a Keyboard Transmission, making it transparent to the software __ Designed by Craig Peacock

10mhz to 20mhz Laser Light Detector -  This circuit was originally designed to detect laser light pulses for an optical Ethernet communications system.  It has good ambient light immunity. . . Circuit by Dave Johnson P.E.-June, 2000

10Mhz to 20Mhz Light Receiver -  Light power to volts conversion = APPROX.15mV per microwatt at 850nM. . . Circuit by David Johnson P.E.-July, 2006

10W Audio Amplifier with Bass-Boost -  High Quality, very simple design No need for a preamplifier __ Contact: Flavio Dellepiane, fladello @ tin.it

10W HF Amplifier with KT907 -  Schematic only, no circuit description __ Designed by © 2001YO5OFH, Csaba Gajdos

10W HF Linear Amplifier -  This project and your efforts will provide you with a 0.55  3 watt input to easily 10 watt output.  The two linear amplifiers are ment for use with QRP SSB/CW/FM/AM transmitters on the amateur bands 15 and 17 meters can be powered from a 12 volt DC supply.  The design is a good balance between output power, physical size.  The completed amplifier will reward the builder with a clean, more powerful output signal for a QRP rig when radio conditions become marginal.  It has a RF-sensing circuit   (Q2) wich allows the amplifier to switch on automatically when transmitting.  This project uses a "classic" RF transistor.  MOSFET power amplifiers are discussed and build in the near future on this website. __ Designed by Guy Roels ON6MU

120VAC Under Voltage Tester -  Using a cheap 24vac transformer, this circuit can test a product under low 95vac conditions.    With the components show, it has a rating of 250 watts max.. . . Circuit by David Johnson P.E.-July, 2006

1296MHz high gain Amplifier -  Schematic only, no circuit description __ Designed by © 2001YO5OFH, Csaba Gajdos

13cm power Amplifier -  Schematic only, no circuit description __ Designed by © 2001YO5OFH, Csaba Gajdos

1Hz to 10kHz Voltage to Frequency Converter -  JFET inputs with anti phase-reversal circuitry allow the LTC1055/56 to be used as a precision, ultra-high impedance comparator.  The precision provides for very high linearity of the V/F generation while the high speed allows a large frequency range of operation. __ Linear Technology/Analog Devices App Note, Jun 21, 2011

1W 10GHz Power Amplifier -  We briefly describe here the 2-stages PA built to increase the power of the homebuilt transverter without impacting its originally compact design. __ Designed by Andrea  IW9HJV and Johnny  IW9ARO

1W HF QRP -  Schematic only, no circuit description __ Designed by © 2001YO5OFH, Csaba Gajdos

2 Nanosecond, .1% Resolution Settling Time Measurement for Wideband Amplifiers -  Linear Technology AN128 __ Designed by Jim WilliamsAug 16th, 2010

2 Note Ribbon Controller -  Even if you've never played with a ribbon controller you have at least seen one and know what they are.  They are far and away the most organic and intuitive controller available for synthesizers.  Sliding a finger up and down the ribbon can control the pitch of an oscillator or some other parameter. __ Designed by John Simonton

2.8-GHz prescaler keeps cost down -  07/20/00  Published in EDN    The prescaler in Figure 1 inexpensively extends the range of a frequency counter by dividing the input signal’s frequency by a factor of 1000.  The guaranteed input-frequency range. __ Circuit Design by Neil Eaton, Emsys Engineering, Peterborough, ON, Canada

20 Watt Class a Power Amplifier -  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

20 Watt GaAaFET Power on 2.3 GHz -  Photocopypoor quality __ Designed by R. Berteismeier DJ9BV

20 Watt/Channel Stereo Power Amplifier -  Based on the versatile LM1875 from National Semiconductor __ Designed by Rod Elliott  ESP

200W MOSFET Amplifier -  A compact audio powerhouse ideal for guitar or PA work or for use as a general-purpose subwoofer or hifi amplifier.  Many people prefer MOSFETs because of their legendary ruggedness.  Altronics had a MOSFET amplifier module which produced 200W

20Mhz VCSEL 3mw Laser Test Circuit -  This circuit takes advantage of some new vertical cavity surface emitting lasers   (VCSEL) that don’t require light output control circuits.  The circuit shows how to drive the device from a single high speed CMOS IC. . . Circuit by Dave Johnson P.E.-June, 2000

22/7-A CMOS implementation of the Big Muff Pi -  This circuit was born with the idea of making a CMOS workalike of the well known Electro-Harmonix Big Muff Pi   (BMP).  We chose the name Twenty-two Sevenths or 22/7 since it is a rational approximation of pi.  The gain and frequency response of each stage were adjusted to match the corresponding stage on a BMP.  The result is a rich and full sounding pedal that evokes some of the fuzz sounds circa 1969, as well as some classic singing leads. __ Contact: holler @ runoffgroove.Com

2304 & 3456 MHz Power Amplifiers -  Note: quality of  text is poor. __ Designed by Greg McIntire  AA5C

23cm 20W PA with M57762 -  Schematic only, no circuit description __ Designed by © 2001YO5OFH, Csaba Gajdos

23cm 40W PA with M57762 -  Schematic only, no circuit description __ Designed by © 2001YO5OFH, Csaba Gajdos

25W QRO with PL504 -  Schematic only, no circuit description __ Designed by © 2001YO5OFH, Csaba Gajdos

27MHz toy car receiver -  RF circuits are not easy to build.  The purpose of this page is to make the circuit diagrams available for educational purposes.  I won't be able to help you contructing them or give more info than what is written on this page. __ Designed by Peter Jakab

27MHz toy car Transmitter -  schematic only, L1=same as L4, L2=15 turns, .5mm wire, 5mm diameter, L3=3.5 turns, .5mm wire, 5mm diameter] __ Designed by Peter Jakab

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


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