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Theory and Construction of MIC Splitters:
(electronic schematic / circuit added 4/02) |
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Thermofan to Keep Your Amp Cool: (diagram added 6/03) |
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Three Band Equalizer: (electronic
Circuit diagram added 03/03) |
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Three High Accuracy RIA/ IEC MC and MM
Phono PreAmplifiers: (electronic schematic / circuit added 4/02) |
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Three Transistor Audio Amp 50
Milliwatt: Here is a little audio amplifier similar to what you might find in a small transistor radio. (added 4/02) |
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Tips on the MP3 Player Kit: The kit version
of the MP3 player has been released. This document is tips for building the MP3 player kit and modification hints. (added 10/05) |
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Transistor Organ: (circuit added 2/07) |
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Tube active crossover: (diagram added
2/07) |
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Tube Amplifier: The unit is powered
directly from the 120 volt AC line, with no power transformers. Filaments are wired in series, with the total adding up to 117 volts (35 + 35 + 35 + 12). The 35W4 forms a half-wave
rectifier, which is filtered by a three-stage RC network. The B+ for the output stage plates and screens are taken from the second capacitor, and the B+ for the preamp and phase inverter
from the third capacitor in the filter. |
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Tube opamps: Photos of an antique analogue computer
unit Soviet, naturally!: (electronic design added 6/07) |
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Two Channel Power Amplifier
#2: The2-Channel Power Amplifier based on NTE1606. The circuit is powered by a12V,10-Amp power supply. The power of the output channels is4 W connected to 8-ohm loudspeakers |
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Two Channel Power Amplifier:
Circuit design (added 7/03) |
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Two Tone Train Horn: (schematic / circuit
added 2/07) |
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Two Transistor Amplifier: (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 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 / (added 05/07) Pulse-width-modulated stereo power amplifier saves components. |
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Ultra Low Noise Low Dropout Regulator Achieves 6 Nv/√Hz Noise Floor:
06/23/05 EDN Design Ideas / (added 10/05) LDO has ultralow-noise output. |
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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 to the bootstrap effect that the circuit provides as a by-product of
its operation. Designed by Andrew R. Morris. (added 09/05) |
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Ultrasonic Switch:
Circuit of a new type of remote control switch is described here. This circuit functions with inaudible (ultrasonic) sound. Sound of frequency up to 20 kHz is audible to human beings. The
sound of frequency above 20 kHz is called ultrasonic sound. The circuit described generates (transmits) ultrasonic sound of frequency between 40 and 50 kHz. As with…. (added 10/05) |
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Underwater microphone: (electronic
schematic / circuit added 2/05) |
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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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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 blow shows the
frequency response of the ideal inverse-RIAA filter (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. |
