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Electronic Schematics - D

Decoder Circuits

Closed-Caption Decoder -  This is a closed-caption decoder with serial output based on a Microchip PIC16F628A. The internal comparators of the PIC16F628A are used to implement a peak detector and data slicer.

Composite VGA encoder/decoder eases display upgrade -  09/28/06 EDN-Design Ideas.....Upgrade an RGB video system without adding cables..... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.

CA3090 Stereo Decoder -  Stereo Multiplex Decoder

Caller ID Decoder

Circuit forms satellite-dish command decoder -  4-Mar-04 Issue of EDN  By decoding the commands sent by a direct-broadcast satellite receiver that uses the DISEQC (digital-satellite-equipment-control] protocol, you can troubleshoot.

8-channel DTMF Link: Decoder -  In the decoder designed for the DTMF Link project a Holtek HT9170B does the main job. The natural counterpart of the HT9200B used in the associated encoder.

ADC-to-PC interface Transfers data in nibbles  -  12/09/99 EDN-Design Ideas.....The circuit in Figure 1 uses a Centronics printer port to interface an eight-channel, 8-bit ADC to a PC. The circuit cuts  cost of addressing and decoder circuitry and saves one expansion slot for interfacing.

Decoder lights the way -  19-Feb-09 Issue of EDN  A two-line-to-four-line decoder indicates status even when both signal lines lose power..... [Design Idea by Jean-Bernard Guiot, Mulhouse, France]

Encoders and Decoders -  Selector guide ~ links to pages that tell why you need Encoder and Decoder ICs in your Wireless system. Application circuits. [free schematic from Golab.com]

Hints and kinks for USB decoding -  7-Feb-02 Issue of EDN  The USB is a serial data-transmission system that uses cables to connect peripheral equipment to PCs. All new computers have two orUSB receptacles, and the predictions are that they will replace most of the legacy receptacles on older PCs. The 1.0 and 1.1 standards for USB were for 1.5 and 12 Mbps at low- and full-speed rates, respectively..... [Design Idea by Bert Erickson, Fayetteville, NY]

HP48SX IR DECODER

Improved PL Tone Decoder -  A significant amount of interest has been generated since my last article on a PL tone board. Because of this interest I decided to improve on the old PL tone design. Figure 1 is an inexpensive PL tone generator with significantly improved performance. It has a much more stable tone frequency as well as the elimination of the loading problem on the output. The transistor used in the old circuit would cause the tone frequency to change at high levels.  This month's circuit eliminates all those problems..... [Radio Amateur Society of Norwich]

LFSR provides encryption -  13-Sep-01 Issue of EDN  LFSRs (linear-feedback shift registers] find extensive use in cryptography. For example, the cryptographic algorithms in the GSM (Global System for Mobile communications] mobile-phone system rely on the use of LFSRs. An LFSR comprises a register containing a sequence of bits and a feedback function..... [Design Idea by Antonella Di Lillo and Giovanni Motta, Brandeis University, Waltham, MA]

LM1310 FM Stereo Decoder -  Converts your mono FM Receiver to Stereo

LM1800 Stereo Decoder -  Stereo Demodulator

LM1800 Stereo Demodulator -  Phase-Locked Loop FM Stereo Demodulator

Manchester Co Decoder Fits into 32 Macrocell PLD -  01/06/00 EDN-Design Ideas.....Manchester encoding is common, and this scheme erases the dc-spectrum component present in an NRZ signal in baseband transmissions. An important application is in Ethernet-interface adapters, in which several kinds of media-attachment units interfac..... EDN is migrating links. This link is not verified.  Google the "title" EDN for new link.

MicroController Visualizes Hex Code -  04/27/00 EDN-Design Ideas.....In C systems, information exchanges usually use the hexadecimal 1-2-4-8 format; output data also appear in this format. Reading the hex code is not a problem; several LEDs connected to the output lines can display the answer. The problem arises when you w..... EDN is migrating links. This link is not verified.  Search the "title" EDN for new link.

NTE789 Stereo Decoder -  The NTE789, a monolithic silicon integrated circuit, is a stereo multiplex decoder intended for FM multiplex systems.  This stereo multiplex decoder requires only one low–inductance tuning coil (requires only one adjustment for complete alignment), provides automatic stereo switching, energizes a stereo indicator lamp, and operates from a wide range of voltage supplies.

PAiA: How MS Stereo Decoder works -  The schematic diagram of the MS Decoder may look complicated but is actually quite simple. Both the Mid and Side signals are initially

Phototimer Controls Load -  04/18/02 EDN-Design Ideas.....In industrial and home applications, the need sometimes exists for a device that, after activation by some physical effect, such as light, temperature, or sound, switches a load on for a predetermined time. The load, such as a lamp, motor, solenoid, or heater, usually derives its power from the ac line..... EDN is migrating links. This link is not verified.  Search the "title" + "EDN" for new link.

PL Tone Encoder Board -  If your local repeater has got you singing the PL tone blues, then read on. For less than $10, an inexpensive PL tone generator can be constructed that will bring new life into that old non-PL rig…. [Radio Amateur Society of Norwich]

Professional Stereo Encoder -  Uses high quality NJM2035 stereo coder IC.

Remote Control Encoder/Decoder with PIC16C620 & PIC12C508 - [Peter Jakab, Electrical Engineer, Engineer of Informatics]

Rotary encoder mates with digital potentiometer -  6-Mar-03 Issue of EDN  In developing electronic systems, designers look for products or ideas that may benefit from the better performance, smaller size, lower cost, and improved reliability that an IC can offer. Toward that end, the digital potentiometer emerged as an alternative to its mechanical counterpart, the mechanical potentiometer..... [Design Idea by Peter Khairolomour, Analog Devices, San Jose, CA]

Selective Calling Decoders -  This isn't an Electronics Australia/Dick Smith project, but if you're interested in decoding and logging the selective calling (Selcall) and Automatic Number Indication (ANI) signals used in mobile radio communications networks, take a look at the Anzac Comms selcall decoder page. I (Bob Barker) did the (Zilog) microcontroller software and the PCB layouts for them! 

Sequential Channel Selector Simplifies Software -  01/04/01 EDN-Design Ideas.....An efficient but powerful circuit is useful for a variety of applications with limited I/O and for which you want to use one input to sequentially select a different output channel ( Figure 1 ]. When the software changes the state of only one input,..... EDN is migrating links. This link is not verified.  Google the "title" EDN for new link.

Simple phototimer controls load -  18-Apr-02 Issue of EDN  In industrial and home applications, the need sometimes exists for a device that, after activation by some physical effect, such as light, temperature, or sound, switches a load on for a predetermined time. The load, such as a lamp, motor, solenoid, or heater, usually derives its power from the ac line..... [Design Idea by Abel Raynus, Armatron International, Melrose, MA]

Simple Surround Sound Decoder -  This surround-sound decoder is based on the "Hafler" principle, first discovered by David Hafler sometime in the early 1970s. The original idea was to connect a pair of speakers as shown in Figure 1, for use as the rear speakers in the surround setup.

Single Printer Port Pin Acts as an Encoder Output -  06/07/01 EDN-Design Ideas.....Encoders and decoders are common elements in alarm, remote-control, and measurement systems. However, most of these devices require many I/O lines when under microprocessor or PC control. For example, the HT-12E encoder has eight address pins, four..... [Deaign Idea by Haobin Dong, Huazhong University of Science and Technology, China]

TDA1591 Stereo Decoder -  Stereo Decoder with TDA1591 IC.

Use Your Printer Port as a High-Current Ammeter -  07/06/00 EDN-Design Ideas.....With a few inexpensive components and INT1Ch, you can turn the printer port of your PC into a high-current ammeter.… [Design Idea by K Suresh, Indira Gandhi Centre for Atomic Research, Kalpakkam, India]

You've Got Mail -  08/19/99 EDN-Design Ideas.....Many e-mail programs provide a "beep" or a pop-up message box signaling the user that a new e-mail message has arrived. If you are too far from the computer to hear the audible signal or if the monitor is turned off, then..... [Design Idea by ary Kath and Craig Bishop, Scotch Plains, NJ]


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