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Active Load in Gain Stage - Instead of a resistor at the transistor's collector,
you might have seen a current source (active component) substituted in an audio amp's
gain stage. Why go through the trouble of the added components? You'll find the active
loading of a current source packs ...(spice design added 02/09) |
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Active Subwoofer (Analog) - Analog Devices Application Notes (app note added
2/06) |
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Active Subwoofer (Intersil) - Intersil Application Block Diagram (app note
added 3/06) |
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Active Subwoofer and Controller - (electronic circuit added 7/03) |
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Active-filter circuit and oscilloscope inspect a Class D amplifier's output -
(Design Ideas - EDN, 12/01/2006) Ease debugging of bridge-output
pulse-width-modulated audio amplifiers with this circuit. (electronic design idea
added 12/06) |
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Advanced Audio Amplifier - This is roughly the minimum number of components that
represents the classic audio amplifier topology. You can clearly see the three stages
found in many audio amps (and op amps today). However, looking at actual audio
designs, you'll find the basic topology has been tweaked and enhanced in a few key
locations....(spice design added 02/09) |
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All About Audio Amplifiers - Amplifiers would be nothing without tone controls.
They allow us to boost or cut the low and high ends of the audio spectrum. Nobody
would buy an amplifier or preamp that did not have them. Because these controls are so
important designers spend a lot of time and effort on these circuits.....(circuit
design added 09/08) |
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All-Triode Direct-Drive Tube Amps for Electrostatic and Electret Headphones - Two
electrostatic headphone driver designs: the second is DC-coupled and uses high voltage
Apex op-amps as DC regulators. They will drive Stax and Sennheiser electrostatic
phones, and the author includes directions for adapting the designs to other models.
These are "the best electrostatic headphone amplifiers currently available, anywhere
in the world." Will also drive electret headphones. Recommended only....Designed by
Kevin Gilmore (circuit design added 04/05/06) |
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Altec 1566A:Vacuum Tube Preamp & Direct Box Project - There are all sorts of tube
circuits, some of which actually deliver The Sound people associate with Vacuum Tubes.
Did you know, for example, that asymmetrical distortion generates even-order harmonics
while symmetrical distortion produces odd-order harmonics? Neither vacuum tubes
nor transistors are exclusively responsible for either type of distortion, it’s really
about circuit design. (added 4/02) |
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Amp with Tone Controls & Soft Switching - Built around an LM380, this amplifier
includes tone controls and electronic "soft switching". The soft switching circuitry
ensures power is built up gradually eliminating the dc thump…(added 07/07/07) |
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Amplified Ear - Useful to listen in faint sounds. 1.5V Battery operation.
(electronic circuit added 06/07/08) |
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Amplified Ear (drawn by R. Kollman) - This circuit, connected to 32 Ohm impedance
mini-earphones, can detect very remote sounds. Useful for theatre, cinema and lecture
goers: every word will be clearly heard. You can also listen to your television set at
a very low volume, avoiding to bother relatives and neighbors. Even if you have a
faultless hearing, you may discover unexpected sounds using this device: a remote bird
twittering will seem very close to you. ….(electronic schematic added 11/08) |
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Amplifier - So what the heck is a Gainclone? Originally, the term Gainclone meant
a clone of the 47 Laboratory Gaincard. The 47 Laboratory Model 4706 Gaincard is
understood to have the following general features ...(electronic design added 7/08) |
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Amplifier 2x30W with STK465 - ….(circuit design added 03/08) |
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Amplifier Considerations in Ceramic Speaker Applications - Maxim App Note 4164
-- 2/5/2008 -- (app note add 5/08) |
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Amplifier of acoustic frequencies with preamplifier - Minimal signal of entry:
94mVp-p with preamplifier, 0,65Vp-p without the preamplifier….(circuit design added
08/08) |
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Amplifier
removes common mode noise on RGB differential video transmission line - 4/13/06
EDN-Design Ideas / (added 10/06) Use a single operational amplifier
to minimize common-mode signals' effects on differential-component-video receivers. |
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Amplifier removes common-mode noise on RGB differential-video-transmission line -
4/13/06 EDN Design Ideas / (added 10/06) Use a single
operational amplifier to minimize common-mode signals' effects on
differential-component-video receivers. |
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Amplifier Timer - Turns-off your amplifier when idle for 15 minutes. Fed by
amplifier tape-output. (electronic circuit added 06/07/08) |
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AN Integrating CobraNet into Audio Products - (app note added 5/08) |
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An Outboard Digital-to-Analog Converter for Digital Audio Sources - AN-394 Analog
Devices Application Notes (app note added 7/06) |
