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Negative feedback design for Amplifiers - how to modify a small class AB
amplifier for low distortion and minimal power drain…(circuit designed by Lazar Pancic
added 06/05)
No-Compromise OTL Tube Headphone Amplifier - The author achieves his quest
for the ultimate headphone amplifier that offers the best possible sound without any
compromises. Based on the same circuit topology as his "Top-Level" amplifiers, this
version uses a Raytheon 5842....Designed by Andrea Ciuffoli (Circuit design
added 01/08)
Notch filter autotunes for audio applications 24-Jun-10 Issue of EDN
Tracking notch filters find use in harmonic-distortion analyzers; they also can remove
heterodyne noise from ham-radio systems. A conventional tracking switched-capacitor
notch filter relies on a bandpass filter,... [Design Idea by John R Ambrose, Mixed
Signal Integration, San Jose, CA]
Octave Screamer - Note that the octave module consists of only five parts –
input capacitor, transformer, two germanium diodes, and an output volume pot. The
logical extension of this idea would be to add a DPDT switch so the signal could be
routed to either the octave circuit or the TS tone controls. Each path ends with a
volume control and the switch....(circuit added 7/02)
OTP µC controls Boomer amplifier - 03/18/99 Issue of EDN Figure 1
shows a circuitthat uses a one-time-programmable (OTP] µC in an unusual way. A
COP8SGR7 µC uses digital signals to "bit-bang" an LM4835 (dubbed "Boomer" by National]
amplifier. Although the amplifier is designed for potentiometer control, you can
modify it to make it a fully digitally controlled part....Page includes several
designs. Scroll to find this one.... [Design Idea by Wallace Ly, National
Semiconductor Corp, Santa Clara, CA]
Output Transformerless Tube Headphone Amplifier - This OTL mu-follower
design uses paralleled tubes (2 per channel) to minimize noise. It also makes an
excellent preamplifier. Designed by Kurt Strain (Circuit design added
03/08)
