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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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SONIC SWITCH sa SOUND DETECTOR x SOUND ACTIVATED SWITCH x ULTRASONIC SWITCH x VOICE OPERATED SWITCH x VOX (VOICE OPERATED SWITCH) xx REMOTE CONTROL xx SOUND DETECTOR xx SWITCH -- ELECTRONIC Circuit for a complete VOX that can be added to almost any existing transmitter or transceiver. Uses the LM170 AGC/Squelch chip. Improving the vacuum relay QSK in s.s.b.-VOX operation. Build a noise operated COR (carrier operated relay) for a repeater. How to build a deluxe solid-state voice operated relay (VOX). Sound-switch circuit will trigger a tape recorder (or other voice-activated device) using speech of normal volume at a range of several feet. Sound-activated switch. Two hand claps will turn AC devices on or off. VOX box (voice-operated relay) is a multi-fuctional device. Use it to control a tape recorder, switch on an amateur transmitter, slide projector, etc. It can be used with any low- or high-impedance microphone, or a high-level audio source such as a pocket tape recorder. Est. cost: $15 (kit). "Junk Box Vox". A voice-operated relay that turns devices on or off when you start speaking. Est. cost: $10. Remote control switch is activated by a high-pitched dog whistle. Can be used to turn off TV sound. The FET VOX, an electronic device which automatically switches a transceiver to the transmit mode when you start speaking, without flipping a switch manually. Sonic switch will turn power on and off whenever two similar sounds (hand claps, finger snaps, whistles, loud words, etc.) are heard within a one second interval. Sound-operated light controller circuits. Circuit for a sound-activated switch to trigger a strobe-flash to take stop-action photos. The 3rd ear. A sound-actuated electronic control system (switch). Turn things on-or-off at the snap of your fingers. Will also turn things on for a preset interval, then automatically turn them off. Sound sentry. A noise-activated device will switch on interior and exterior lights, audio system, etc. whenever an unusual sound is detected. How to check your TV's remote-control system. Both infrared and ultrasonic types are discussed. Circuit for a sound-operated switch that will sense the ringing of a telephone and translate this to a flashing lamp. Voice-operated switch (VOX) circuit is intended for the control of high-power loads, but can be modified for low-power applications. Sound-activated switch. Features both latched and timed outputs. VOX box. Voice-operated relay can be used for a variety of purposes, including control of a tape recorder, switching on an amateur transmitter, controling a slide projector, etc. Door-slam switch turns on electric lights whenever door is closed hard. Eliminates need to fumble for lightswitch. Unlock the mystery of voice/remote activation circuits. Expand the usefulness of portable cassette recorders with these circuits. (1) Extended-play circuit slows down the rate of tape travel. (2) Sound-activated tape switch starts recorder when sound is detected. (3) Telephone auto-record circuit records telephone calls coming in and going out from the same phone line. Tone-activated relay circuit can be used to turn on, or off, a wide variety of devices. Est. cost: under $9. Schematic for a voice activated relay built around an LM370 integrated circuit. Hand-clap electronic control turns on and off lights and other electrically operated devices. Clap twice to activate the control. Voice-activated switch to trigger the "remote" jack on a tape recorder. Est. cost: $30 (kit). Dog whistle signals remote control unit. Miniature remote control receiver weighs 1-1/2 oz. Operated by a 600 to 800 cycle tone-modulated carrier on the 27 mc remote control channels. Remote control transmitter sends signals up to 1 mile to activate receiver described in the April 1965 issue. Can also be used with any tone-modulated signal receiver. Trans-VOX. Transistorized, supersensitive, voice-operated relay turns transmitters, tape recorders and other equipment on and off. You simply plug your microphone into Trans-VOX and plug Trans-VOX into the device to be controlled. Est. cost: $19. Relay turns on a tape recorder motor whenever the signal being monitored is being received. Circuit for a simple voice or sound-controlled relay can handle 1-ampere at 125-volts ac. Experimenting with phase-locked loops. Circuits include an ultrasonic switch, tunable filter, touch switch, and SCA decoder. Using phase-locked loop (PLL) chips to make possible a variety of tone-detection circuits. The type 567 tone decoder is used in automatic garage door openers, radio controlled models, alarm circuits, paging systems and other selective tone circuits. Circuit for a tone-activated relay. Use the "beeper" on an alarm clock to control electrical appliances. Circuit will be activated by either a telephone pickup or a dynamic microphone. It will turn on a light in response to a noise (like a telephone or alarm clock ringing). Useful for people with hearing disabilities. Build the Poor Man's Servant. An inexpensive remote control project that activates or deactivates appliances at the clap of your hands. Sound-activated switch is used to start and stop a cassette recorder automatically for recording intermittent sounds. Voice operated switch uses a voice-recognition chip to respond to a few simple commands (yes, no, on, off, left, right, ...). Signal conditioner circuit is ideal for cleaning up weak and noisy audio or Morse-code signals. May also be used to clean up digital tone signals in a remote-control extender circuit. Sound-operated switch circuit incorporates an optoisolator and can be used to control a lamp. Whistle Switch lets you turn on a TV, radio, or some other device by sound. The switch requires two or more occurances of a specific tone (or sequence of tones) within a specified time period. Various switching circuits. (1) Optoisolator/coupler used to isolate the input signal from the output control device. (2) Oscillator-triggered switch. (3) Dual-control switch uses two AC sources to trigger the circuit on and off. (4) Audio-controlled switch. Build a voice-activated tape recorder switch that controls the "remote" jack on a tape recorder. Est. cost: $13 (kit). Circuit for a sound-activated switch. Just a clap of your hands twice, or almost any other quick double sound within a one-second interval, will activate operation. Whistle-activated switch circuit will close a relay to control an external load. Special microphone incorporates an audio compressor and VOX circuit. It will turn on your recorder at the sound of a voice and keep the recording level automatically adjusted. Circuit for a sound-activated light dimmer. Voice-operated switch (VOX) for your tape recorder. Sound-activated AC switch is inexpensive, reliable, and non-mechanical. Circuit to turn on a light whenever sound exceeds a preset level. Control that turns a lamp or other device off or on at the sound of a finger snap or soft whistle. Controls 100 watts or more, depending on the relay. | |||||||||
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