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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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AUDIO CABLE SWITCH x AUDIO SWITCH xx AUDIO CABLE xx SWITCH Patch plug pleasure. A patch panel features two rows of 1/4" plugs which correspond to the inputs and outputs of all audio your equipment. Two tape monitor circuits. (1) Uses a multiple station, interlock, pushbutton switch. (2) Combines a program selector switch with a tape monitor circuit. Switchbox consists of twelve rear panel jacks. This provides both in and out stereo signals for preamp and two tape recorders (reel and cassette). How to hook-up several Dolby sources through your preamp or receiver and still obtain full monitor functions of the tape recorder. Switches are used to select mode (record or play) and the input source. An IC preamp/console. Part 1. How an audio console functions as the collector, processor and distributor of all sound sources within your system (phonos, tapes, tuners, oscillators, synthesizers, etc.). Design your own switch-and-jack panel. It is built around ordinary 1/4" phone jacks and is better suited to frequent cable changes than the phono connector. An IC preamp/console. Part 2. Planning your own console. Circuits for the various subsystems (mixer, cue, monitor, preamps, etc.). An IC preamp/console. Part 3. Operation manual Double dub and fader. This unit lets you (1) transfer from one tape recorder to another while monitoring either recorder, (2) master fade both channels during the transfer process, or (3) record FM/stereo or phone on either recorder while monitoring. Two out of one. Master switching center to control all the inputs of a stereo system and direct the output to three pairs of speakers in different rooms. Each speaker pair is equipped with its own volume control. Switch box manipulates input and output to and from tape recorders, tuner, equalizer, etc. Two simple switching circuits for using two tape decks. Both circuits allow dubbing from either deck to the other and a choice of monitoring. An audio activated power switch. A device to switch on the "mains" (electric power) to an audio power amplifier whenever an audio signal appears on the input of the amplifier. When the audio signal is removed the device switches the mains off again after a predetermined time (2-6 minutes). The AB box. A switch box facilitates performing listening evaluations of high level sources, phone preamps, speakers, etc. Handy switch box is a modification of the DB Systems unit (4 shielded inputs, 4 grounding posts, and 2 outputs). Tip on rewiring a preamp's switching facilities to reduce the number of switch contacts in the signal path. Build Hafler's XL-10 A/B/D distortion test box. A convenient switchbox which makes use of the Hafler Excelinear technique as an aid to evaluating the accuracy of an amplifier through listening tests. Tip on constructing a passive volume control starting with the DB Systems switchbox. Switchless audio switch. Electronic function switching uses touch switches. Can be adapted to remote control. Advice on using mercury-wetted reed relays for low-level audio switching. A trial-balloon passive control. Construction of a simple passive preamplifier (audio switch) which eliminates the power-line noise found in an active preamplifier. Optimizing the S/PDIF (Sony/Philips Digital Interface). Hidden hazards and hook-up hints when using cables, connectors, and input switching for digital audio. Audio delay circuit that originally appeared in Popular Electronics is modified for control by an 8-bit parallel port. Demonstrates how to attach a computer to any circuit that normally uses mechanical switches. Audio switcher lets you choose between eight-different stereo-audio input sources, and feed the selected signal to one pair of stereo inputs on an amplifier. Whole-house audio wiring system. Uses a keyboard to direct 8 stereo inputs to 4 audio outputs. Part 1. Overview of organization. Whole-house audio wiring system. Part 2. Keyboard. Whole-house audio wiring system. Part 3. Circuit that will assign switch selection to one of four outputs. Whole-house audio wiring system. Part 4. PC circuit board layout. Using FETs as audio switches. 5x5 Audio Switch Box. Switch the connections between audio components without touching a single wire with this homebrew accessory. Handles 5 inputs/outputs in any combination. Built-in headphone amplifier allows you to monitor any of the outputs. Diode switching circuits to switch audio from one point to another. Audio, video additions. Tips on selecting and installing a switch box to provide additional jacks and equipment combinations for your audio/video system. A signal-processor patch box (switching facility) allows easy rearrangement of outboard audio gear. Build a stereo component switchbox. Matrix switchbox allows you to add or delete components without rewiring. Est. cost: $95 (for a 6x6 matrix unit). Video/audio switcher. Build this baseband-signal switcher to preserve the clarity lost to modulation/demodulation schemes. Provides 75-ohm buffered, video-input/output ports, stereo-compatible buffered I/O's, and tape-monitoring capabilities. Build an eight-channel audio switcher that provides more inputs to your audio amplifier for auxiliary equipment. Build a surround-sound switchbox. Control where your home-theater or stereo system's audio is coming from and add surround sound with this handy device. Uses a passive circuit to create the Hafler effect using existing sum and difference signals. Est. cost: $20. Circuit to mute a stereo sound system whenever the telephone rings or the doorbell is activated. Whole-house audio. How to rig up a speaker-selection box that works with X-10 remote control . Audio output can be directed to either zone 1 or zone 2 stereo speakers using X-10 signals. Est. cost: $66. Audio/video switcher. Eliminate the mess and confusion of wires that lurk behind your audio and video equipment with this easy to build 4x1 switcher. Triple audiovisual switcher circuit uses one IC to simultaneously select video and two-channel stereo audio from any one of three sources and then route them to one of two selected outputs. Tip on doing more valid "blind" A/B audio tests by using an add-on infrared remote control to switch between the items under test. | |||||||||
Copyright © by Norman Lathrop Enterprises. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means (electronic, mechanical, print photocopying, recording or otherwise) without the prior expressed permission of Norman Lathrop Enterprises, except as permitted by law. |
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