2 Transistor FM Transmitters:  (added 8/03)

3 Transistor FM Radio Bug:  (Electronic Circuit / Schematic added 10/04)

300 W PWM Amplifier (with stuffing option):  This reference design allows customers with limited knowledge of digital audio amplifiers to quickly build solutions, which meet Dolby, EMI and FTC standards, reducing the time-to-market for new consumer audio products. This 6 channel reference design, based on the TDA8925ST and TDA8926J power stages, is available with an output power of 3 x 100 W.  (circuit design added 3/05)

4 MHz Amplitude Modulated RF Source :  the only tuned component is the crystal (Circuit / schematic design added 6/06)

5 Watt FM Transmitter with Antenna (88-108 MHz):  (added 11/05)

60 Hz modulator records process variables :  02/16/98 EDN-Design Ideas  / (Circuit / schematic design added 6/06)   The circuit in Figure 1 allows you to record process variables (4 to 20 mA, 0 to 10V dc) on a three-phase power monitor designed to record only ac waveforms. Many of these recorders have a seventh channel, normally used for recording neutral current, which you can use as a process-variable input. The circuit operates by generating a 0 to 1V-rms output sine wave whose amplitude is a function of a 0 to 10V-dc input signal. IC1 can be any rail-to-rail quad op amp rated for ±5V power supplies. Input stage IC1A buffers the input-voltage divider R1-R2 and drives the two-quadrant multiplier, IC1B. IC1B acts as a multiplier by using Q1 to switch its gain from 1 to 1....

68HC11 Function Generator:  (Electronic Schematic / circuit added 4/02)

A Design and Manufacturing Guide for the Lead Frame Chip Scale Package (LFCSP):  AN-772 - Analog Devices Application Notes  (app note added 6/06)

ABR-42023 / PWM Methods for Expanding CCRL Dimming Range Using the ML4877 or ML4878:  Fairchild Application Notes / (Circuit / schematic design added 6/06)

Active clamp/reset PWM IC Becomes more versatile:  06/26/03  EDN-Design Ideas / (Electronic circuit added 10/03) The UCC3580 (www.ti.com), IC1 in Figure 1, is an active-clamp/reset-PWM IC that has all the requisites of a power-supply IC except for current limit. You can use the shutdown pin (16) for this purpose (see the UCC3580 data sheet). But when the shutdown pin activates, the soft-start capacitor normally connected to Pin 15 discharges, and the converter starts again, resulting in hiccup mode...

Adaptive Differential Pulse Code Modulation using the PIC16/17:  Microchip Application Note - Published 26-Aug-97   (Circuit / schematic design added 6/06)

Add on AM Modulator has High Bandwidth:  09/11/98 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)  

AM Receiver:  (added 8/03)

AM Transmitter:  (added 8/03)

AM/FM/SW Active Antenna:  This circuit shows an active antenna that can be used for AM, FM, and shortwave SW. On the shortwave band this active antenna is comparable to a20 to30 foot wire antenna. This circuit uses receivers that use untuned wire antennas, such as inexpensive units and car radios. L1 can be selected for the application (added 1/03)

AM-Receiver for Aircraft communication (118.250MHz):  (Electronic circuit added 4/05)

AN-214: Ground Rules for High Speed Circuits :  AN-214-Analog Device Application Notes  (app note added  2/06)  Layout and Wiring Are Critica in Video Converter Circuits.

AN-237: Choosing DACs for Direct Digital Synthesis:  AN-237 - Analog Devices Application Notes  (app note added 6/06)

AN-292: Applications of the LM3524 Pulse-Width-Modulator:  National Semiconductor - Application Note   (app note added  2/06)

AN-306: Synchronous System Measures µΩs :  AN-306-Analog Device Application Notes  (app note added 2/06)  Synchronous Detection Scheme Measures Low Resistances

AN-307: Modem-Circuit Techniques Simplify Instrumentation Designs :  AN-307-Analog Device Application Notes  ((app note added 2/06)  A commutating modem circuit, whether an ICorpc-board, can serve as a building block form any measurement-system functions, reducing noise and ensuring the integrity of transmitted data.

AN-308: Commutating Amp Multiplies Precisely :  AN-308-Analog Device Application Notes  (app note added 2/06) 

AN-345: Grounding for Low-and-High-Frequency Circuits :  AN-345-Analog Device Application Notes  (app note added 2/06)  Know Your Ground and Signal Paths for Effective Designs.  Current Flow Seeks Path of Least Impedance-Not Just Resistance....

AN-349: Keys to Longer Life for CMOS :  AN-349-Analog Device Application Notes  (app note added 2/06)  Here's How CMOS Canbe Protected Against Abuse

AN-354: Ask the Applications Engineer 1-Multi Troubles :  AN-354-Analog Device Application Notes  (app note added 2/06)  Addresses problems of ten encountered with LOG Circuits, Time Division Analog Multiplexing, and ADC Power Strobing

AN-402: LM2889 RF Modulator:  National Semiconductor - Application Note   (app note added 2/06)

AN-4129 / Green Current Mode PWM Controller FAN7601:  Fairchild Application Notes / (Circuit / schematic design added 6/06)

AN-607: Pulse Width Modulation A/D Conversion Techniques with COP800 Family Microcontrollers:  National Semiconductor - Application Note   (app note added 2/06)

AN-683: Strain Gage Measurement using an AC Excitation :  AN-683-Analog Device Application Notes  (app note added 2/06) 

AN-772: A Design and Manufacturing Guide for the Lead Frame Chip Scale Package (LFCSP) :  AN-772-Analog Device Application Notes  (app note added 2/06) 

AN-815: Variable Range PWM A/D for COP820CJ:  National Semiconductor - Application Note   (app note added 2/06)

AN-824: Eight Channel Eight Bit PWM Controller:  National Semiconductor - Application Note   (app note added 2/06)

AN-826: A 2.x GHz WiMAX Direct Conversion Transmitter :  AN-826-Analog Device Application Notes  (app note added 2/06) 

AN-H23: Avoiding Turn-on Oscillations in HV91 Family PWM ICs:  Supertex Semiconductors (app note added 2/06)

App Note 35 - PWM AC-DC Power Supply Design:  Apex Microtechnology Corp - App Note - (Circuit / schematic design added 6/06)

Applications of the LM3524 Pulse-Width-Modulator:  National Semiconductor - Application Note   (app note added 2/06)

Ask the Applications Engineer 1-Multi Troubles:  AN-354-Analog Device Application Notes  (app note added 2/06)  Addresses problems of ten encountered with LOG Circuits, Time Division Analog Multiplexing, and ADC Power Strobing

Avoiding Turn-on Oscillations in HV91 Family PWM ICs:  Supertex Semiconductors (app note added 2/06)

Characterizing Digitally Modulated Signals with Ccdf Curves:  Aligent Application Note  (app note added 6/06)

Choosing DACs for Direct Digital Synthesis:  AN-237 - Analog Devices Application Notes  (app note added 6/06)

Circuit makes simple FSK modulator:  10/11/01 EDN Design Ideas  /  (added 1/05)  The need for a compact telemetry system poses a challenge for designing a small, light, low-component-count system. Interfacing serial data from the microprocessor is also difficult because most low-cost RF transmitters do not accept dc levels at the input. Commercial FSK (frequency-shift-keying) modulators are bulky and need many passive components. ...

Circuit Provides Efficient PWM:  02/18/99 EDN-Design Ideas / (added 2/06) You often need to control the duty cycle of a square wave. The circuit in Figure 1 works from a single 5V supply at a frequency of 100 kHz. With minor component changes, you can configure it for a range of frequencies. The circuit consists of a ramp (sawtooth) oscillator and a comparator. The circuit compares the ramp to an externally applied voltage, VCNTRL. When VCNTRL is greater than the ramp voltage, the PWM output is 5V. The sawtooth oscillator consists of a current source (R1, R2, R3, and Q1), a timing capacitor (C1), and the oscillator-control circuitry (R4, R5, R6, and IC1A). The oscillator-control circuitry sets the upper and lower voltages of the timing capacitor at 3 and 1V....

Circuit sequences supplies for FPGAs:  01/23/03  EDN-Design Ideas / (Electronic circuit added 10/03) System designers must consider the timing and voltage differences between core and I/O power supplies (in other words, power-supply sequencing) during power-up and power-down. The possibility of a latch-up failure or excessive current draw exists when power-supply sequencing does not occur properly. The trigger for latch-up may occur if power supplies apply different potentials to the core and .....

CK-3V FM Transmitter:  (Electronic circuit design added 02/05)

Class B Series Modulator:  (Electronic circuit added 7/03)

Commodore 64 Video Modulator 251025 Schematics:  takes in S-video format video + mono audio, outputs S-video, composite video and modulated RF signal (Circuit / schematic design added 6/06)

Commodore 64 Video Modulator 251696 Schematics:  (Circuit / schematic design added 6/06)

Commodore RF Modulator:  (Circuit / schematic design added 6/06)

Commutating Amp Multiplies Precisely:  AN-308-Analog Device Application Notes (app note added 2/06) 

Current Amp Provides Frequency Modulation:  12/04/97 EDN-Design Ideas / (Electronic Schematic / circuit added 4/02)  

DDS Deviceprovides amplitude modulation:  09/2/99 EDN Design Ideas /  (added 2/06) 

Digisound Ring Modulator:  (Circuit / schematic design added 6/06)

Digital countdown timer may never need battery replacement:  06/23/05 EDN Design Ideas  / (Circuit / schematic design added 6/06)  Processor-based timer draws microamps.

Digital Potentiometer Controls Phase Shift:  02/15/96 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)

Digitally Controlled Phase Shift Using the DS1669:  Maxim Application Notes / 975 / Dec-05  (app note added 6/06)

Dual Voltage Controlled Filter with Modulator:  (Electronic circuit added 7/03)

Dual Voltage Controlled Oscillator with Modulator:  (Electronic circuit added 7/03)