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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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HEADPHONE sa HEADPHONE ACCESSORIES sa HEADPHONE AMPLIFIER x EARPHONE xx ELECTRONICS xx LOUDSPEAKER How to select stereo headphones. A look at the major types, what they cost and how to pick the best for your needs. How to add a headphone system to a stereo. Also, how to hook into a television antenna to improve radio reception of your stereo set. A guide to shopping for stereo headphones. Output a high-level audio signal from a tuner/amplifier into your lawn by means of a metal stake. Then you can "listen" to your lawn by inserting a metal stake which is attached to a headphone. Use it to liven up your next lawn party. Headset amplifier powered by 9-volt battery. Use to connect an FM tuner to earphones. How to add a battery powered speaker/amplifier to the Heathkit HW-8 transceiver to eliminate the need for earphones. Est. cost: $12. An outboard volume control for your receiver. Designed for use with high-impedance headphones. Est. cost: $5. How to connect a combination headset/boom microphone to your TR2500 walkie-talkie to allow hands-free operation. How to use stereo earphones with your amateur receiver. A simple circuit for impediance matching (1,000-ohm to 8-ohm) and converting from stereo to monaural. Headsets. A comprehensive look at the selection and use of headsets for amateur radio operators. Peaking headphones for CB. How to hook up crystal headphones. Wireless headphones. Picks up inductive field. Device to restore the low-frequency time-delayed sound from the left channel to the right ear and right to left. This eliminates the unnatural, exaggerated stereo effect of stereo headphones. Adapting stereo headphones for use by hams. Circuit uses one IC to match impedance and improve voice frequency response. Build noise-canceling headphones which let you mix in a signal from a CD or tape player. This lets you minimize background noise while still listening to music. Integrated circuit which delivers 250 mW to an 8-ohm speaker can be used as a headphone driver, low-power audio amplifier, and telephone pickup amplifier. Connecting earphones to an old magnetic speaker radio. Transistorized stereo-headphone amplifier. Est. cost: $6. Stereofone, a dual IC amplifier designed specifically with input equalization for a magnetic phono cartridge and output to feed stereo headphones. Easy-to-build headphone adaptor lets you use high-impedance phones on a radio, TV, tape recorder, etc., which was originally equipped with the earplug-type earphone of only 8- to 10-ohm impedance. Use a telephone induction coil pick-up, attached to your earphones, to record onto cassettes. Useful for recording shortwave broadcasts, amateur radio broadcasts, etc. Add a mechanical filter to old-fashioned earphones, the kind with a metal diaphragm. This will improve CW (continuous-wave code) reception. Troubleshooting weak spots in headphone wiring. The Rabbit Ear is hooked between your headphones and an amplifier. When room noise above a preset level is detected, the Rabbit Ear cuts into your headphones and lets you listen to whatever it's picking up. Schematic diagram of a small amplifier that can convert a transistor radio from earphone to loudspeaker operation. Headphone repair. It often takes very little effort or expense to put new life into defective stereo headphones. Noise limiter circuit is placed between receiver and earphones. TV audio amplifier picks up the TV's audio output signal and amplifies it enough to drive a set of earphones for private listening. Uses an electret microphone element as the pick-up. Troubleshooting the source of electronic noise in your aviation headphones. What causes various types of noise and where to look for the fault. How to connect two earphones to a transistor radio with only one jack. Headphone amplifier circuit. Uses the common LM386 integrated circuit, a 9-volt battery and a few other components. Est. cost: under $11. How to wire up 16 earphone jacks to a single 45 watt amplifier. Stereo and mono together. Modifying a mono headphone jack to properly accept either stereo or mono phones. Inexpensive wireless headphones. A simple induction system lets you listen to audio sound in privacy. Does not transmit stereo, only good-quality mono. Est. cost: $25. Airline headphone substitutes. This device takes the discomfort out of listening to music or in-flight movies by substituting electrically operated headphones for the air-driven ones you rent. Make stereophones from surplus headphones. Transistor circuit for impedance-matcher allows low impedance headphones to be attached to high impedance outputs. Stereo headphone control unit allows remote selection of speaker or headphone operation and remote adjustment of headphone volume level. Four-way adapter lets up to four earphones be attached to a small transistor radio. Simple stereo headphones made from two plastic funnels, two small speakers, and a plastic headband. Est. cost: $1. Circuit for an integrated circuit for a headphone amplifier. Offers good match to a 600-ohm headset. Proper methods for connecting headphones to hi-fi speaker output terminals. Simple circuit for attaching stereo headphones to any stereo radio without a phone plug. Noise clipper will prevent loud noises caused by interference from getting to your headphones. Make a pair of mono or stereo headphones by attaching two of the small earplug-type earphones onto each end of a steel band which goes over your head. Filter removes the 60-Hz hum you get when using hi-fi headphones with a shortwave receiver. Circuit to introduce a certain amount of "crosstalk" to make headphones sound stereophonic rather than binaural. Clipper circuit filters out bursts of noise caused by atmospheric and power switch noise interference. The clipping threshold is adjustable. Cord buster. Eliminate the need for headphone umbilical cords that keep you tethered to your stereo system by constructing this short-range FM transmitter. Wireless headphones use an infrared transmitter/receiver combination. Tip for ham radio operators on avoiding hearing loss when operating with headphones. Earphone adapter for car radio. Wireless pickup brings TV or phono sound to your ears through an individual receiver. Est. cost: $3 per receiver unit. Easily-made multiple headphone outlet box accommodates up to four headsets plugged in simultaneously. Tip: How to attach stereo headphones to an inexpensive pocket radio. Illustration shows the difference between 2- and 3-conductor phone plugs. A super-simple headphone stereo amplifier. Works only with moderate-impedance (over 50 ohms) stereo headphones. Amplifies a phonograph, FM tuner, or tape deck. Battery powered. A look at quadraphonic headphones available on the market with comparison chart of ten brands. Special evaluation of the Telephonics Fixler-effect phones. Buyer's guide to stereo headphones. Circuit for a low-distortion audio limiter which attenuates sudden changes in volume. Use with any receiver. Ideal for use with earphones. Circuit for adding a headphone jack to a radio or TV. Tips on troubleshooting headphones and speakers in antique radios. How to wire up a low-impedance headphone jack that will automatically silence a speaker when the phones are plugged in. Tips on adding an earphone jack to a television set. Build a set of stereo headphones. Est cost: $4. Personal hi-fi. Miniature stereo headphone amplifier. Powered by a single D battery. Est. cost: $3. | |||||||||
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