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Tape Head Demagnetizer Cassette  - (electronic schematic / circuit added 2/05)

Telephone Headgear - A compact, inexpensive and low component count telecom headset can be constructed using two readily available transistors and a few other electronic components. Since the circuit draws very little current, it is ideal for parallel operation with electronic Telephone set. (added 4/02)

Telephone Headset Amplifier - This circuit goes between a telephone and a headset. The project has a headset cord and plug (cut from a cheap cell phone headset) on the input and a suitable jack on the output. The speaker signal passes through this circuit, but the microphone signal is passed straight from the plug to the jack.  This circuit is specifically....Designed by Andrew R. Morris  (added 09/05)

Telephone Record Control (Randy Linscott) - This circuit will allow you to connect any tape recorder that has a mic and remote input to a phone line and automatically record both sides of a conversation when ever the phone is in use.You will need to take a couple of voltage readings before connecting the circuit….(circuit added 7/02)

Telephone Recorder (Aaron Cake) - This circuit lets you record your ph1-conversations automatically, notice that this circuit does not provide isolation between Telephone line and the recorder (added 04/03/02)

Telephone Recorder tjacodesign - This circuit automatically records all incoming and outgoing phone-conversations with an ordinary cassette or tape recorder. The circuit below distills the audio signal from the phone-line and automatically starts/stops the cassette recorder. (added 4/02)

Telephone Recording Circuit epanorama - How they work and some example  (added 4/02)

Terrestrial Set-Top Box NTSC/PAL - Intersil Application Block Diagram  (app note added 6/06)

The Collected Grado Headphone Mods  - This collection of Grado headphone modifications comes from posts by Skippy, Beagle, TimD, Voyager, Neruda, Chych and Squirt in the HeadWize forums. The mods are grouped into 3 categories: Transducer, Earcups and Headband, Earpads, Cables. There are even instructions for how to fix the infamous Grado "grattle." The article specifically....  Designed by Skippy et al.  (circuit design added 01/08)

The Technology of the Fuzz Face - The Fuzz Face remains an enigma today, perhaps three decades after it first hit the market. This simple, two transistor circuit remains for many the very definition of the guitar effects stomp pedal. What makes such a simple circuit the stuff of legend?....(circuit design added 04/05/06)

Theremin - the theremin is a musical instrument that uses electronic circuits to produce audible tones, having the unusual aspect of being controlled by the player's hand motions near the instrument's two "antennas," without the hands touching the instrument. One hand is used to control the theremin's pitch, and the other hand is used for controlling the volume, a tip....

Theremin (Tony van Roon) - This circuit uses a common CMOS 4069 IC.  The MC14069 is pin for pin compatible….(Tony van Roon's circuits added 08/09)

Theremin Controller - (electronic circuit added 4/05)

Theremin Model Introduction - Since the publication of the type 144 theremin project article in September, 1998, many of them have been successfully constructed. As in the 144, and its forerunner, the Southwest Technical Products model 142, the 145 theremin retains a heterodyne topology similar to that used by Mr. Theremin in his original instruments. (8/03)

Tiny audio Amplifier using LM386 - ….(electronic schematic added 08/08)

Tone Detector - (electronic circuit added 7/03)

Tone Generator - (electronic circuit added 7/03)

Top-Level OTL Tube Headphone Amplifier - This article shows my tube headphone amplifier designs for driving headphones with an impedance of 200 to 600 ohms (I am using these amplifiers with the Sennheiser 580, which has a 300-ohm impedance). The problem with many tube headphone amplifiers ..... (circuit design added 9/06)

Transistor Organ (Aaron Cake) - This simple circuit can provide hours of enjoyment as you learn tunes, play duets or just make some really weird sounds by pushing all the buttons at once. You have probably seen this circuit before, it is fairly common. I have seen it in several....designed by Aaron Cake (added 04/03/02)

Troubleshooting Electrostatic Headphones - Tips for troubleshooting and repairing electrostatic headphones.  Designed by Mark Rehorst  (circuit design added 08/08/08)

Truth About Vocal Eliminators - Sometimes a vocal can be removed almost completely, but just as often the results are disappointing, just information without circuit diagrams (added 4/02)

Two Line Output Combiner - Convert consumer equipment stereo signal to mono or combine audio signal from two different equipments to1-input (added 4/02)

Two way cross-over 3500 Hz  - ….(design added 08/08)