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Two-Tone Train Horn - With this circuit you can electronically simulate the noise
of a diesel-train horn. The sound is triggered automatically as the train reaches a
desired place on the track so you can produce the sound as the train approaches
stations, level crossings, etc. The circuit can be built simply by using one 556 or
two 555 timers. The rest of the parts are readily available and not critical. The
output...(Tony van Roon's schematic / circuit added 2/07) |
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Two-Transistor Audio Amplifier - A simple two-stage amplifier. Use any
general-purpose NPN with high gain. It will drive low impedance headphones directly. A
speaker will probably require further boost…(added 05/05/05) |
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Two Transistor Amplifier - This was one of the earliest circuits that I ever
designed and built, in Spring 1982. At that time I had only an analogue meter and a
calculator to work with. Although not perfect, this amplifier does have a wide
frequency response, low harmonic distortion about 1.5%, and is....(electronic circuit
added 1/03) |
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Two Transistors Audio Amplifier - (electronic design added 6/07) |
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Two Watt Amplifier - Low distortion amplifier using discrete components (added
5/02) |
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Two way cross-over 3500 Hz - ….(design added 08/08) |
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Two Wire Remote Microphone Amplifier - uses special amplifier module from Op-Amp
Labs (added 4/02) |
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Two-channel audio amplifier drives stepper motor - 12/1/2006 EDN Design
Ideas Pulse-width-modulated stereo power amplifier saves components. (Design
Idea added 05/06/07) |
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Ultra Low Noise Low Dropout Regulator Achieves 6 Nv/√Hz Noise Floor - 06/23/05 EDN
Design Ideas LDO has ultralow-noise output. (design idea added 10/05) |
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Ultra-Low Noise Low Distortion Audio Op Amp - Linear Technology LT1115 (app
note added 02/05) |
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Ultra-Low Quiescent Current AF Power Amplifier - This is an audio power amplifier,
similar to what is common in transistor radios and other portable audio equipment.
This circuit however, has an ultra-low quiescent current of about 250uA, due to a
unique bias circuit. I don’t even know of a chip that does that. This circuit also has
much higher open-loop gain, due ....Designed by Andrew R. Morris (added 09/05) |
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Universal Preamplifier - ….(design added 08/08) |
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Updated 60-100W Hi-Fi Power Amplifier - ….(electronic schematic added 03/08) |
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Urei 527 Equalizer Schematic - (electronic schematic / circuit added 9/06) |
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Urei 533 Equalizer Schematic - (schematic / circuit added 9/06) |
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Urei 537 Equalizer Schematic - (schematic / circuit added 9/06) |
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Urei 545 Parametric Equalizer Schematic - (schematic added 9/06) |
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Urei LA 2A Schematic - (schematic added 9/06) |
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Urei LA 3A Schematic - (electronic circuit added 9/06) |
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Urei LA 4, this is the black faced LA4, uses 846 op amps Schematic - (electronic
circuit added 9/06) |
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Urei LA 4A, silver LA-4, uses all 4136 op amps Schematic - (electronic circuit
added 9/06) |
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USB Sound Card with PCM2702 - Make a sound card is no more a complex issue. If you
use great IC PCM2702 from BURR BROWN / Texas Instruments you can create a fully
functional USB sound card. This sound card can be…(added 08/08/08) |
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Use Amplifier Phono Input as Line Level Input: Inverse RIAA Filter - The circuit
does two functions: signal level attenuation and inverse RIAA filtering. The signal
attenuation is needed to convert the 500 mV signal to 2.5 mV signal. The inverse-RIAA
filtering is needed to make the frequency response of the system flat (same
equalization that is used when music is transferred to vinyl in the studio). The
picture ....(added 11/05) |
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Using Split Supplies - MP7720 - DN0001 - Monolithic Power Systems, Inc Design Note
(added 3/06) |
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Using the Analog Devices Active Filter Design Tool - AN-649 Analog Devices
Application Notes (app note added 2/06) |
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Using the SSM2167 Evaluation Board - AN-583 Analog Devices Application Notes
(app note added 2/06) This document explains how the evaluation board is set up and
how to use it to evaluate the SSM-2167. |
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Using your Op-Amp Circuit in the real world - Almost all active (semi-conductor or
tube based) audio units add some degree of DC voltage bias. What this means is that
the audio signal can have positive or negative voltage bias - this is something that
can cause large distortion errors,....(added 08/08/08) |
