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Amplifier Circuits:  Power Circuits
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Amplifier -- Main Page

Last Updated: November 30, 2017 07:37 AM

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Single 2.7V Supply 4MHz 4th Order Lowpass Butterworth Filter -  Benefiting from low voltage operation and rail-to-rail output, a low power filter that is suitable for antialiasing can be built as shown in this circuit.  On a 2.7V supply the filter has a paSSBand of approximately 4MHz with 2VP-P input signal and a stopband attenuation that is greater than –75dB at 43MHz.  The resistor and __ Linear Technology/Analog Devices App Note, Jul 20th 2010

Single Ended 5687 Amplifier -  Single Ended 5687 Amp and power supply schematics, only, for now. __ Designed by robert.m.danielak

Single Ended to Differential Transimpedance Amplifier -  This circuit shows the LTC6406 connected as a single-ended transimpedance amplifier with 20kΩ of transimpedance gain.  The BF862 JFET buffers the LTC6406 input, drastically reducing the effects of its bipolar input transistor current noise.  The VGS of the JFET is now included as an offset, but this is typically 0.6V so the __ Linear Technology/Analog Devices App Note, Mar 31, 2010

Single Supply 10MHz Lowpass Filter Features the LT1819 Op Amp & Adjustable Bandwidth Up to 20MHz -  Low noise, low distortion LT1819 circuit trades parts count and components sensitivity for an adjustable bandwidthup to 20MHz Diff in diff out circuit.  Measured signal-to-noise plus distortion for LT1819 circuit is 71.5dB, just a little nosier than the fixed bandwidth LT6600-10 filter differential filter. __ Linear Technology/Analog Devices App Note, Jul 2, 2012

Single Supply 16-Bit ADC Driver -  This circuit shows the LT6203 driving an LTC1864 unipolar 16-bit, 250ksps A/D converter.  The bottom half of the LT6203 is in a gain of 1 and buffers the 0V negative fullscale signal VLOW into the negative input of the LTC1864.  The upper half of the LT6203 is in a gain of 10, referenced to the buffered voltage VLOW and drives __ Linear Technology/Analog Devices App Note, Jul 2, 2012

Single-Ended 2A3 Amp -  This amp uses a 6C45pi input tube loaded by a 1:1 Interstage Transformer (I used the inexpensive model available from Allied Electronics).  The 6C45pi is supposedly not rated for more than 200V on the plate, but I have not had any trouble with 300V in this application.  You may not wish to follow in my footsteps if you paid a lot for your 6C45pi's __ Designed by Bob Danielak

Single-Ended to Differential Converter with Gain of +2 & Common Mode Control -  Because the gains of each channel of the LT6411 can be configured independently, the LT6411 can be used to provide a gain of +2 when amplifying differential signals and when converting single-ended signals to differential.  With both channels connected to a single-ended input, one channel configured with a gain of +1 and the __ Linear Technology/Analog Devices App Note, Mar 31, 2010

Single-sideband Demodulator covers the HF band -  10/26/00 EDN-Design Ideas The circuit in Figure 1 complements a previous Design Idea(SSB modulator covers HF band  EDN , Sept 30, 1999, pg 122].  The modulator employs a phasing. __ Circuit Design by Israel Schleicher, Bakersfield, CA

Small Area Photodiode in Normal TIA Configuration -  Small area photodiodes have low capacitance.  To maintain low noise operation it is important to keep the input capacitance low so that the miniscule input noise current of the CMOS amplifier, and not the voltage noise, dominates the overall circuit noise.  The total input capacitance from the amplifier in this circuit is the __ Linear Technology/Analog Devices App Note, Mar 16th 2010

Soft Start for Power Amps -  Although the soft start circuit can be added to any sized transformer, the winding resistance of 300VA and smaller transformers is generally sufficient to prevent a massive surge current.  Use of a soft start circuit is definitely recommended for 500VA and larger transformers __ Designed by Rod Elliott  ESP

Solid state linear HF Amplifiers -  Not a project yet, but very theoretical thoughts about very practical amplifiers! __ Designed by Manfred Mornhinweg

Solid State Power Op-Amp Amplifier -  LM675 Amp Schematics, only.  This was my minimalist interpretation of the so-called "Gaincard" amplifier.  It uses the minimum number of parts I could get away with.  All parts are directly soldered to the IC leads for minimal stray inductance.  It works and sounds suprisingly good! __ Designed by Bob Danielak

Solid-state Fender Blackface Preamp -  All-FET version of the celebrated valve guitar preamp; Can be easily modified to Marshall Tone Controls specs __ Contact: Flavio Dellepiane, fladello @ tin.it

Song Number Display -  Here’s a circuit to display the song number in an audio system for quick reference to songs.  It also serves the purpose of an extra visual indicator in modern audio systems.When __ Electronics Projects for You

Sound Modifier -  Four shape-controls portable unit; Wide variety of output waveforms __ Contact: Flavio Dellepiane, fladello @ tin.it

Spartacus AO-44 Guitar Slave Amp -  small push-pull tube amp __ Designed by G. Forrest Cook

Splitter-Blend -  The Splitter-Blend provides two buffered parallel effects loops with a Blend control.  Also, a phase polarity switch is included to allow phase matching of the effect loops.  Possible uses are blending two sets of effects placed in the loops, a signal splitter, a simple mixer, or to blend an effect with the dry signal.  The phase inverter can be used for interesting results when mixing dry and effected signal. __ Contact: holler @ runoffgroove.Com

Spot-frequency Sine Wave Generator -  300Hz, 1KHz, 3KHz "output stable" test equipment tool.9V battery powered portable unit __ Contact: Flavio Dellepiane, fladello @ tin.it

Spreadsheet converts sound levels -  05/12/05 EDN-Design Ideas Calculate sound level versus source distance __ Circuit Design by Dan O'Brien, Mallory Sonalert Products Inc, Indianapolis, IN

Spring Reverb -  The Hot Springs tanks and circuit board should be mounted in a location that is free of ambient electro-magnetic fields.  The input and output jacks are typically placed on a patch panel with other effect's inputs and outputs.  In use, the effects or aux send buss of the console patches to the Hot Springs input and the output of the Hot Springs returns to one of the mixer inputs for control of reverb level in the total mix.h __ Contact: PAiA Corporation USA

Spring Reverb Unit for Guitar or Keyboards -  A high performance spring reverb unit for guitar amps __ Designed by Rod Elliott  ESP

Spring Reverberation Module -  Build it and get great concert hall effects for your guitar or keyboard instrument. __ SiliconChip

Stage center reverb unit -  Schematic only __ Designed by Craig Anderton

Stepped Gain Photodiode Amplifier -  At low signal levels, the circuit has a high 100kΩ transimpedance gain, but at high signal levels the circuit automatically and smoothly changes to a low 3.1kΩ gain.  The beneit of a stepped gain approach is that it maximizes dynamic range. __ Linear Technology/Analog Devices App Note, Mar 22, 2010

Stereo Audio Isolator -  This circuit is useful for removing ground loop hum on a remote line level audio signal line.  It can be used to to connect a computer sound card to a stereo amplifier's line input.  Other uses include tapping into a line level signal for powering a remote amplifier, and removing common mode ground interference on 12 Volt audio equipment such as a car stereo.  The circuit can be used in mono applications by simply ignoring the second channel __ Designed by G. Forrest Cook

Stereo power Audio Amplifier using TDA7297-2 x 15 Watts-Mute & Stand-by optional-Easy to assemble -  complete stereo amplifier circuit including printed circuit board to power of 2 X 15 Watts.  Using minimum of components in the integrated circuit TDa7297 ST Microelectronics.  This IC presents in its interior two bridge amplifiers, making it useful for use where a stereo amplifier need easy assembly.  may operate with voltages 6-18 volts and has […] __ Designed by Antonio Rodrigues

Stereo Push Pull 3CX300A1 Amplifier -  The schematic is shown HERE.  At some point I will add some detail for this amp, but it is loosely based upon my "Beast" amplifier, referenced elsewhere on this page. __ Designed by Bob Danielak

Stereo Width Controllers -  Sometimes, for a variety of reasons, it would be nice to vary the width of the 'sound stage' when listening to stereo recordings.  Although technically this is anything but hi-fi, it is a useful addition to PC speakers, or even for the music centre in the listening room. __ Designed by Rod Elliott  ESP

Stomp Switch wiring -  Stomp Switch wiring __ Designed by Guitar Effect RC Keen

Studio Switcher -  Made for Radio Glen at Southampton University, and still in use at the re-named low power AM and web broadcasting station SURGE: Southampton University Radio from Glen Eyre.  Triumph of relay based logic, or unnecessarily retro? You decide.  Nothing with this many illuminated push switches can be all bad. __ Designed by Henry 

Supreaux Deux -  The Supro 16T adapted for use as a distortion stompbox. __ Contact: holler @ runoffgroove.com

S-Video Splitter (AC Coupled) -  This figure shows an LT6551 quad amplifier driving two sets of S-video (Y/C format) output cables from a single Y/C source.  Internal gain-setting resistors within the LT6551 reduce part-count. __ Linear Technology/Analog Devices App Note, Mar 25th 2010

Synthesized HF Receiver -  This receiver was originally designed for simplicity and low cost, but, like other projects, it grew.  My receiver is now synthesized and the performance is quite comparable to many commercial designs.  The unusual features of this design are: * Common AF transistors and AF circuitry have been used for the IF amp, in a transformerless design.  This aids construction and stability.  ; * IF bandwidth is restricted by conventional L.  C.  tuned circuits which are not damped by any resistive or active devices.  This gives a performance, even for CW working.  The IF is 500KHz and NOT 465KHz.  ; * Options for three different Local Oscillators.  I used a Marconi Sig.  Gen.  with this receiver for over a year, before I overcame lethargy and built a decent LO __ Designed by Harry Lythall-SM0VPO

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