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

Audio Amplifiers:   #'s       A - D        E - M        N - R      S - U     
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Last Updated: November 30, 2017 10:27 AM

Circuits Designed by Dave Johnson, P.E. :
Improve the quality of standard TV images  -  I designed this circuit many years ago, based on the claims that the technique would improve the quality of standard TV images.  The circuit adds information to the edges of the objects and was reported to bring out more detail.  After building and testing . . . Hobby Circuit designed by David A. Johnson P.E.-July 08, 2000

Infrared TV/VCR Remote Booster  -  This circuit will boost the signal from any infrared TV or VCR remote, extending the range by a factor of 3X.   . . . Circuit by Dave Johnson P.E.-October 05, 2005

IR TV/VCR Remote Booster  -  This circuit will boost the signal from any infrared TV or VCR remote, extending the range by a factor of 3X.   . . . Hobby Circuit designed by David Johnson P.E.-October 05, 2005

Low Pass Filter, 3Khz, with an Audio Amp  -  This circuit uses a switched capacitor filter IC from National Semiconductor to filter signals with frequencies higher than the 3KHz needed for voice audio.  The schematic includes an audio amplifier that is designed to drive a standard audio head phone . . . Hobby Circuit designed by Dave Johnson P.E.-June 04, 2000

Microphone On/Off Switch Circuit is Pop Free  -  This circuit uses a simple technique to eliminate the usual “pop” sound when an electret type microphone is switched on or off.  The circuit is completely passive and will work on dynamic and electret type microphones . . . Hobby Circuit designed by Dave Johnson P.E.-February 15, 2002


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


Jericho Horns -  The design of this horn loudspeaker was published in the German DIY magazine Klang & Ton 1.  Each horn contains one Fostex FE 208 Sigma loudspeaker unit.   Efficiency of the horn is 100 dB (1W, 1m), impedance 8 Ohms, and the frequency response is 47 Hz...18 kHz within 3 dB (with correction filter, see the article in Klang & Ton). __ Designed by Aren van Waarde

JFET Bass Preamp -  I wanted a warm, tube-like sound with as few stages as possible.  I believe that part of the clarity and directness of a tube amp comes from the fact that there are so few phase invertions compared to a normal solid state (not to mention the different kinds of unpleasant distortions made by op-amps).  So I came up with the absolute minimum setup: Two (inverting) gain stages and one source follower/impedance converter.  JFETs, because they behave similar to tubes at overload conditions (of course, nothing but a tube really sounds like a tube...) __ Designed by Albert Kreuzer

JFET Double Balanced Mike Preamp -  Based on a Design by Graeme Cohen AES Preprint #2106 __ Contact: info @ forsselltech . com

JFET Jig1 -  Schematic of a Test Fixture for testing JFETs __ Contact: info @ forsselltech . com

JFET matching fixture -  A circuit which can match JFETs for Vgs at a "typical" current, which produces good results for JFET-type phasers like the Phase 90. __ Designed by Guitar Effect RC Keen

JFET Mike Preamp using Jensen JE16 Input Transformer -  Schematic Only __ Contact: info @ forsselltech . com

JFET992/3 Summing Amplifier Circuit -  Summing buss and amplifier circuit for an Audio Console design __ Contact: info @ forsselltech . com

Jitter Detector Input -  Part #1 of a 2 part schematic __ Contact: info @ forsselltech . com

Jitter Detector Output -  Part #2 of a 2 part schematic __ Contact: info @ forsselltech . com

Jitter Modulator -  Schematic Only __ Contact: info @ forsselltech . com

JLH Class-A Amplifier -  The 1996 version using the specified transistors with +/-22V supply rails and a quiescent current of 2A has an approximate rms power output, into a resistive load, of 10W into 16ohm, 20W into 8ohm, 15W into 4ohm and 10W into 2ohm.  For minimum distortion, (Circuit design 08/08/08) 

JLH Class-A Update -  Tim is a professional musician (a classical concert pianist) and so I trust his subjective judgement when it comes to assessing the accuracy and realism of sound reproduction.  Before Tim first contacted me, he had built a kit version of the 1996 design, which he had

Klauskorrektor I -  The first phono stage __ Contact: klausmobile @ yahoo.Com

Klauskorrektor II -  This regulated power supply was built as a simplified outboard version of a PSU in my first phono stage.  Replacing hexfreds with tube rectifier eliminates the need for power-on sequencing.  Chassis (salvaged from a hospital laser PSU) size is 180W*240D*100H mm with a 125W double-C core __ Contact: klausmobile @ yahoo.Com

KRELL KMA160 Class-A Mono Block Amplifier -  KRELL KMA160 Class-A mono block amplifier.  The output power is 160 Watts for 8 Ohms and 320 Watts for 4 Ohms loudspeakers.  


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