Circuit Sage - Analog RF Design Resources

Circuit Sage - Analog RF Design Resources

Complete source of information to help you design great circuits fast. Awebsite designed by integrated circuit designers for circuit designers.

• A/D Design
• Filter Design
• PLL Design
• Transmission Line Design

channel-e Design Corner

channel-e Design Corner

German - English - Russian information portal focussing on all aspects of Electronics and Electrical Engineering. Presents daily news targeted at design engineers and managers in the fields of hardware and software engineering.

Informs design engineers at SMBs, OEMs, ODMs, TEMs, design houses, VARs and System integrators.

Electronics Club Tutorials

Electronics Club Tutorials

John Hewes, Kelsey Park Sports College.

• Example Projects
• Construction of Projects
• Soldering Guide
• Study Electronics
• Electronic Components
• Circuit Symbols

This is good place to start your electronics study, it has a practical and simple Approach - delabs

LM336-2.5 - Voltage Reference Diode

The LM136-2.5/LM236-2.5 and LM336-2.5 integrated circuits are precision 2.5V shunt regulator diodes. These monolithic IC voltage references operate as a low-temperature-coefficient 2.5V zener with 0.2 dynamic impedance. A third terminal on the LM136-2.5 allows the reference voltage and temperature coefficient to be trimmed easily.



The series is useful as precision 2.5-V low-voltage references (VZ) for digital voltmeters, power supplies, or operational-amplifier circuitry. The 2.5-V voltage reference makes it convenient to obtain a stable reference from 5-V logic supplies.

LM336-2.5 - Voltage Reference Diode

Features

• Low temperature coefficient
• Wide operating current of 400 µA to 10 mA
• 0.2 dynamic impedance
• ±1% initial tolerance available
• Guaranteed temperature stability
• Easily trimmed for minimum temperature drift
• Fast turn-on

(This was used by me in the manufacture of Indicators and Controllers and was used in place of ICL8609  as that was not in supply)

Related Resources -

ETX, modification of electronic circuit - By changing the 2,5 Volt reference diode from a fixed LM385 to an adjustable LM336 of 2,5 V, The DC motor voltage and therefore the motor speed can be adjusted.

Precision Op-Amp Current Source - In this circuit we tackle the error indicated in the earlier Current Source. The LM336-2.5V eliminates the tiny error of the regulated supply and resistors. Thereby increasing Precision to a higher degree.

Electronic Projects by Martin Clausen

Electronic Projects by Martin Clausen

This is the combined homepage of  Hannes , Jonas and Martin

Electronic Projects for 8051 Development

Virtual walk through my 8051 development suite is a virtual sightseeing tour through my 8051 lab. Dual Slope ADC for 8051 -   A low cost circuit to measure voltages with a precission up to 14 bit.

Some of the Projects here are

• 8051 Development - Code, schematics and hints for development with 8051
• Digital Frequency Generator -Frequency generator with DDS technology
• µC ADC - RS232 controlled 16 bit data aquisition
• Low-cost ADC - PC to take a look at signals up to 1 KHz
• Datalogger- 8 channel, 2 counter, 64K RAM, LCD, RS232
• MiniDS- Mini Digital Storage Scope, one channel, low cost ADC.

Control HD44780-based Character LCD

Control HD44780-based Character LCD
The Industry Standard Character LCD

• 8051 example
• PIC example

by Peter Ouwehand from Netherlands

Integrated Publishing - Electronics Training

Integrated Publishing - Electronics Training

Your source for manuals, engineering reference manuals, and all training material.

• Antenna and Masts - operation manuals for Antennas and Masts.
• Electronic Calibrators - operation manuals for Electronic Calibrators
• Inverters - operation manuals for Inverter equipment
• Oscilloscopes - operation manuals for Oscilloscopes equipment
• Power Supplies - operation manuals for Power Supply equipment

EdSim51 - 8051 Simulator

A virtual 8051 is interfaced with virtual peripherals such as a keypad, motor, display, UART, etc. The student can write 8051 assembly code, step through the code and observe the effects each line has on the internal memory and the external peripherals.

EdSim51 - 8051 Simulator

The student can learn how to scan a keypad, multiplex 7-segment displays, control a motor and count its revolutions, etc.

A Note from the Developer - Jjames Rogers - ."While lecturing in electronics at IT Sligo, I searched the Internet for an 8051 simulator suitable for teaching but to no avail. I therefore decided to develop my own simulator for the basic 8051 with virtual peripherals attached to the four ports."

"After about a year's working on the project, on and off, the result was the EdSim51 simulator. I then put together a set of notes that are now the Beginner's Guide to the 8051on this website."

The Virtual Peripherals:

• Analogue-to-Digital Converter (ADC)
• Comparator, UART
• 4 Multiplexed 7-segment Displays
• 4 X 3 Keypad and 8 LEDs
• DC Motor and 8 Switches
• Digital-to-Analogue Converter (DAC) - displayed on oscilloscope

SG2525 - SG3525 - PWM SMPS Regulator Chip

SG2525 - SG3525 - PWM SMPS Regulator Chip. A second generation ic switch mode controller optimized for high frequency.

SG3525 - Voltage Mode PWM

The SG3525A pulse width modulator control circuit offers improved performance and lower external parts count when implemented for controlling all types of switching power supplies. The on-chip +5.1 V reference is trimmed to +/-1% and the error amplifier has an input common-mode voltage range that includes the reference voltage, thus eliminating the need for external divider resistors. Half Bridge, Push-Pull.



Specs

• 8.0 V to 35 V Operation
• 5.1 V +/- 1.0% Trimmed Reference
• 100 Hz to 400 kHz Oscillator Range
• Separate Oscillator Sync Pin
• Adjustable Deadtime Control
• Input Undervoltage Lockout
• Latching PWM to Prevent Multiple Pulses
• Pulse-by-Pulse Shutdown
• Dual Source/Sink Outputs: +/- 400 mA Peak

100kHz Half Bridge Convertor - SG3525

This is a SMPS Circuit improved over the Application Note in the book SGS Motion Control Application Manual. This worked well. It helps you learn more about High Frequency Power Supply Design.

SG3525 usage in SMPS 500W - It was used in Parallel for Electroplating with a central Load sharing control between modules.

ICM7217 Presettable Up-Down Counter

The ICM7217 is a four digit, presettable up/down counter with an onboard presettable register continuously compared to the counter. The ICM7217 is intended for use in hard-wired applications where thumbwheel switches are used for loading data, and simple SPDT switches are used for chip control.

ICM7217 Presettable Up-Down Counter

This circuit provides multiplexed 7 segment LED display outputs, with common anode or common cathode configurations available. Digit and segment drivers are provided to directly drive displays of up to 0.8 inch character height (common anode) at a 25% duty cycle.

The frequency of the onboard multiplex oscillator may be controlled with a single capacitor, or the oscillator may be allowed to free run. Leading zeros can be blanked. The data appearing at the 7 segment and BCD outputs is latched; the content of the counter is transferred into the latches under external control by means of the Store pin.

Multiplexed Presettable Timer with ICM7217

• Four Decade, Presettable Up-Down Counter with Parallel Zero Detect
• Settable Register with Contents Continuously Compared to Counter
• Directly Drives Multiplexed 7 Segment Common Anode or Common Cathode LED Displays
• On-Board Multiplex Scan Oscillator
• Schmitt Trigger On Count Input
• TTL Compatible BCD I/O Port, Carry/Borrow, Equal, and Zero Outputs
• Display Blank Control for Lower Power Operation; Quiescent Power Dissipation <5mW
• All Terminals Fully Protected Against Static Discharge
• Single 5V Supply Operation

Three Point Preset Counter

delabs Notes-

This is another Intersil Masterpiece in days when using uP was complex and uC was not available.A 8085 could be used but with many supporting chips and it consumed power. This was a CMOS innovation low on power and just one ASIC had the fexibility for many digital operations.A ThumbWheel and Display Interface completed a Gadget.

Linden H McClure Embedded System Design

Linden H McClure Embedded System Design

Embedded System Design -

Embedded System Design is focused at the fundamentals of embedded system design, and is meant to give students experience in both hardware and firmware.

Computer Solutions - Embedded Development Tools

ARM, PPC, Coldfire products, tutorials and a nice database of 8051 chips. Supplying Embedded Development Tool in UK and The EU.

Computer Solutions Ltd - Embedded Development Tools

Assemblers, Compilers and Simulators - cross development software available for most micros.


Portable Digital Oscilloscope DSO-2102

The DSO-2102 PC-Based Oscilloscopes connect to your desktop or laptop via the parallel port or USB port (optional). Both channels can operate at up to 100 Million Sa/s with a 32K sample buffer. The 2102M version includes a Spectrum Analyzer (FFT), Advanced triggering, Pass/Fail testing and displays many other useful characteristics of the data.

More at COMSOL

TCP/IP for 8 and 16 bit Embedded Engineers. - An introduction to the subject including descriptions of many of the most important protocols and which ones to use in particular situations with example Embedded Applications.

A series of Embedded Tutorials gives you a fast introduction to CPU families and new communications technologies.

MicroNet TCP/IP for 8 & 16 bit Micros now with Wireless Ethernet 802.11b support.

Computer Solutions Ltd
1a New Haw Road, Addlestone, Surrey KT15 2BZ, England

Robust Electronic Design - John R Barnes

Robust Electronic Design

"As an engineer, I am always working on new things. So I am going to make some mistakes. But I find it very embarrassing to have to redo something because of a mistake that I could and *should* have avoided. ....."

John R. Barnes KS4GL

"My first book, Electronic System Design: Interference and Noise Control Techniques, concentrated on designing electronic equipment to work."

Industrial Standards Index

EMC/EMI/ESD standards for residential/ commercial/ light-industry generic devices

Full Standards Index

(EMC), electromagnetic interference (EMI), and electrostatic discharge (ESD) standards for information technology equipment (ITE) and related (generic) equipment.

Robust Electronic Design, Inc.

Silicon Sams Technology Resource

Silicon Sam's Technology Resource

Samuel M. Goldwasser's latest and most fabulous "Notes on the Troubleshooting and Repair of..." series of comprehensive repair guides for consumer electronic equipment and other household devices. Detailed diagnostic and repair procedures are provided for: small electrical appliances, audio equipment, TVs, VCRs, CD players, computer monitors, microwave ovens, even lawn mowers - and much much more!

Sam's Laser FAQ has a great deal of information on a variety of laser and optics related topics including a comprehensive treatment of diode, helium-neon, argon/krypton ion, and CO2 lasers as well as amateur laser construction including numerous examples of truly home-built lasers. Much of this is not available anywhere else either on-line or in print!

• Sci.Electronics.Repair FAQ Home Main Table of Contents
• On-Line Tech-Tips Databases.

Holger Heinemann Brainstorming Page

Holger Heinemann Brainstorming Page

Electronic Projects in German.

Brainstormings Pages. Here information is about electronics, Visual basic, Registry, Windows 95/ME.

Heinemann, Holger - Koschatplatz 2 -67061 Ludwigshafen.

• The RC5-Code instruction code for the IR remote maintenance
• Digital indicating panel for spielstaende

Universal Serial Bus Controller - TUSB3210

Universal Serial Bus Controller - TUSB3210

The TUSB3210 is a USB-based controller targeted as a general-purpose MCU with GPIO. The TUSB3210 has 8K × 8 RAM space for application development. In addition, the programmability of the TUSB3210 makes it flexible enough to use for various other general USB I/O applications.

TUSB3210 Generic Evaluation Board (Rev. A) (sllu031a.pdf, 438 KB) Download.

Resources related to TUSB3210

• Keil - TI TUSB3210
• TUSB3210 Drivers and Samples

Solid-State FET-Based Ion Tweeter

Solid-State FET-Based Ion Tweeter

The intention of this project is to design and build a working ion transducer using modern solid-state devices for high efficiency which can be used as a high-quality sound reproducer.

1. Audio input subsystem.
2. Flame control subsystem and interface.
3. Oscillator subsystem.
4. Power supply subsystem.
   

LF398 - Monolithic Sample and Hold Circuit

The LF198/LF298/LF398  are monolithic sample-and-hold circuits which utilize BI-FET technology to obtain ultra-high dc accuracy with fast acquisition of signal and low droop rate.

LF398 - Monolithic Sample and Hold Circuit

Operating as a unity gain follower, dc gain accuracy is 0.002% typical and acquisition time is as low as 6 µs to 0.01%. A bipolar input stage is used to achieve low offset voltage and wide bandwidth. Input offset adjust is accomplished with a single pin, and does not degrade input offset drift.



The wide bandwidth allows the LF198 to be included inside the feedback loop of 1 MHz op amps without having stability problems. Input impedance of 10¹⁰Ohm allows high source impedances to be used without degrading accuracy.

P-channel junction FET's are combined with bipolar devices in the output amplifier to give droop rates as low as 5 mV/min with a 1 µF hold capacitor. The JFET's have much lower noise than MOS devices used in previous designs and do not exhibit high temperature instabilities. The overall design guarantees no feed-through from input to output in the hold mode, even for input signals equal to the supply voltages.

TDA5051AT - Home automation modem

The TDA5051A is a modem IC, specifically dedicated to ASK transmission by means of the home power supply network, at 600 baud or 1200 baud data rate. It operates from a single 5 V supply

TDA5051AT - Home automation modem

Transmission and reception stages are controlled either by the master clock of the microcontroller or by the on-chip reference oscillator connected to a crystal. This ensures the accuracy of the transmission carrier and the exact trimming of the digital filter, thus making the performance totally independent of application disturbances such as component spread, temperature, supply drift.



Transmission mode - To provide strict stability with respect to environmental conditions, the carrier frequency is generated by scanning the ROM memory under the control of the microcontroller clock or the reference frequency provided by the on-chip oscillator

Reception mode - The input signal received by the modem is applied to a wide range input amplifier with AGC (−6 dB to +30 dB). This is basically for noise performance improvement and signal level adjustment, which ensures a maximum sensitivity of the ADC.

LM3914 - Dot Bar Display Driver

The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display. A single pin changes the display from a moving dot to a bar graph. Current drive to the LEDs is regulated and programmable, eliminating the need for resistors. This feature is one that allows operation of the whole system from less than 3V.

LM3914 - Versatile and Easy use Display

• Drives LEDs, LCDs or vacuum fluorescents
• Bar or dot display mode externally selectable by user
• Expandable to displays of 100 steps
• Internal voltage reference from 1.2V to 12V
• Operates with single supply of less than 3V
• LED driver outputs are current regulated, open-collectors

The circuit contains its own adjustable reference and accurate 10-step voltage divider. The low-bias-current input buffer accepts signals down to ground, or V^-, yet needs no protection against inputs of 35V above or below ground. The buffer drives 10 individual comparators referenced to the precision divider. Indication non-linearity can thus be held typically to ½%, even over a wide temperature range.

Millivolt Meter using a LM3914 LED Dot Display



More Reading

• Mains monitor LM3914
• LM3914 analog display

Spread Spectrum and RF Resources

Spread Spectrum and RF Resources

A collection of exceptional resources that will prove useful in your spread spectrum and other wireless projects, ranging from spread spectrum & CDMA tutorials, theory, and circuit diagrams, to development tools, OEM products, and consultants.

RF Resources -

A comprehensive collection of RF & microwave resources for wireless communication engineers. Includes tutorials, theory, design aids, circuit diagrams, products, and more.

4QD-TEC: Electronics Circuits Reference Archive Index

4QD-TEC: Electronics Circuits Reference Archive Index|

4QD-TEC: Electronics Circuits Reference Archive.

Battery Monitoring circuits, Circuit Theory and tutorials, Component types and values, Current sensing and control, Industrial Control circuits and suggestions, Measurement Circuits, Motor Control Circuits. Power Supply circuits, Pulse (Width and position) Modulation Circuits, Relay Driver Circuits, Staircase generators, Test Equipment circuits, Temperature Measurement, Timer Circuits, Ultrasonic Circuits, Voltage/Current controlled circuits.

DiscoverCircuits free electronic circuit links

DiscoverCircuits free electronic circuit links

DiscoverCircuits, has 26,000 + electronic circuits or schematics cross-referenced into 500+ categories. As a vital resource for engineers, hobbyists, inventors & consultants, the site's collection of information will help you find quick solutions to electronic design problems.

Hans Wedemeyers Projects Code and More

Hans Wedemeyer's Projects, Code and More

Universal Radiation Spectrum Analyzer, Jornada Cradle modification and How to Make a Serial Cable, Multi-channel Analyzer Program for the Universal Radiation Spectrum Analyzer, DC Motor Speed Control, Two Channel Platinum Probe Serial Thermometer, Single Channel 24 bit USB ADC and others.

250 W S.M.P.S. with Power-FETs

250 W S.M.P.S. with Power-FETs

Experiments with the PC power supply encouraged me to an "advancement " design. The new power supply is also a forward converter with a half-bridge topology. The difference to the modified PC power supply consists in the following items: Two power FETs instead of bipolar transistors used as power switches.

+ + +

Switching Power Supply Design

Switching Power Supply (SMPS) Design- Tutorials, Circuits, Tools
Lazar's power electronics corner, smps switching power supply design, circuits, schematics, pcbs, electrical engineering reference, software, and other free web resources.
SMPS design, Tutorial, PCB design, Generators, Computer PSU, UPS, Magnetics, EE Reference, Inverters,

Open Circuit Design

This website is the repository for the suite of open-source EDA (Electronic Design Automation) tools including Magic, IRSIM, Netgen, PCB, and XCircuit. These tools are all provided for free under the GNU Public License (GPL). Open Circuit Design is committed to keeping open-source EDA tools useful and competitive with commercial tools.

Open Circuit Design

• Magic, the VLSI layout editor, extraction, and DRC tool.
• XCircuit, the circuit drawing and schematic capture tool.
• IRSIM, the switch-level digital circuit simulator.
• Netgen, the circuit netlist comparison (LVS) and netlist conversion tool.
• PCB, the printed circuit board layout editor.