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IC Audio Amplifiers - n a previous article I discussed building audio
amplifiers using discrete transistors. While it is possible to build good audio
amplifiers from discrete transistors, they are no match for the many audio amp IC's
available to us. IC's offer many advantages including high efficiency, high gain, low
standby current, low component count, small size and ,of course, low cost. It is
little wonder that audio amp IC's have replaced discrete transistors in most consumer
electronic devices. While... [Radio Amateur Society of Norwich--Mike Martell N1HFX]
Inside Story: Audison LR604XR Amplifier (Car Audio) - Of the few car
amplifiers I tested, gutted, decyphered and fixed, this one seems to be the best in
design quality. Too many car amps (although solidly built) are apparently designed by
computer class students, too many traces, too many vias, absolutely wrong component
placement etc. And on schematic level, their different functional parts look like a
newspaper clip collection. If the amp ….(Circuit design added 03/08)
iPod Super Dock Project (Part 1) - This one goes out to everyone that has an
iPod or two laying about and an itchy soldering iron and thinks that the standard USB
or Firewire dock just isn't quite good enough. The tiny thirty pin dock connector on
the bottom of later model iPods contains quite a....(circuit added 07/07/07)
iPod Super Dock Project (Part2) - This one goes out to everyone that has an
iPod or two laying about and an itchy soldering iron and thinks that the standard USB
or Firewire dock just isn't quite good enough. The tiny thirty pin dock connector on
the bottom of later model iPods contains quite a....(circuit added 07/07/07)
iPod Super Dock Project (Part 3) - This one goes out
to everyone that has an iPod or two laying about and an itchy
soldering iron and thinks that the standard USB or Firewire dock
just isn't quite good enough. The tiny thirty pin dock connector
on the bottom of later model iPods contains quite a....(circuit
added 07/07/07)
iPod Super Dock Project (Part 4) - This one goes out
to everyone that has an iPod or two laying about and an itchy
soldering iron and thinks that the standard USB or Firewire dock
just isn't quite good enough. The tiny thirty pin dock connector
on the bottom of later model iPods contains quite a....(circuit
added 07/07/07)
Isolated Telephone Interface - This circuit allows you
to record audio from a telephone line into a tape recorder or
computer soundcard. Most of the parts for this circuit can be
scrounged from an old modem, with some work, it is possible to
rewire the modem circuitry and use the old modem
case....(electronic design added 6/07) [G. Forrest Cook]
JFET-MOSFET Headphone Driver - This amplifier is based on the MOSFET
headphone driver by Greg Szekeres. It has a JFET impedance buffer front-end and
a choke-input power supply. The sound characteristic of the amplifier can be
tuned by adjusting the low pass filter formed with the input capacitance of the
MOSFET. Designed by Richard Murdey (Circuit design added 04/05/06)
