Capacitor Doubles PLD's Performance:  09/14/95 EDN-Design Ideas / (added 2/06) 

Care and Feeding of the PIC16C74 and Its Peripherals:  Microchip Application Note Published 10-Apr-02   (app note added 2/06)

Cascade ABCD Two-Port Networks:  12/23/99 EDN-Design Ideas / (added 3/03)

Cascaded UnManaged Repeater Applications:  National Semiconductor Application Note   (app note added 2/06)

CB-1: SIO Input/Output Register Description:  National Semiconductor Application Note   (app note added 2/06)

CCD Linear Image Sensor to PC Parallel Interface:  (electronic circuit added 4/05)

CCD Video Capture Camera Circuit on Request:  (design circuit added 8/02)

Centronics Port D/A Converter:  (electronic Circuit / Schematic added 10/04)

Centronics Port DA Converters and Lowpass Filter:  (design circuit added 8/02)

Channel-Link PCB and Interconnect Design-In Guidelines:  National Semiconductor Application Note   (app note added 2/06)

Circuit Adapts Differential Input to Drive Coax:  05/08/97 EDN-Design Ideas  / (added 3/03)   -Uses an HFA1100 or HFA1105 to convert a balanced input signal to a single-ended output signal, uses positive feedback to characteristic-impedance matching while increasing the available output swing, as compared with using a simple series termination resistor

Circuit Eavesdrops on RS-232C Lines:  12/05/96 EDN-Design Ideas  / (added 3/03)      

Circuit Eliminates PC Echoes:  03/30/00 EDN-Design Ideas / (added 2/06)

Circuit Expands Eight Pin 68HC11 Port to 64 Pins:  12/07)/95 EDN-Design Ideas / (added 2/06)  

Circuit Forms Novel Floating Current Source:  05/01/03 EDN Design Ideas  / (added 11/05)  Figure 1 shows a polarization circuit applicable to ISFET (ion-sensitive field-effect-transistor) sensors. ISFETs are solid-state chemical sensors that measure the pH value of a solution in biomedical and environmental applications, for example. The circuit in Figure 1 is extremely simple; it sets fixed-bias conditions for ISFET sensors (VDS=I0 RX; IDS=I0).

Circuit Monitors Board, Air, and CPU Temperature to Protect System from Overheating:  App Note 941: Maxim IC  (application note added6/06)

Circuit Protects Computer's Input:  05/26/94 EDN-Design Ideas  / (added 3/03)   The circuit in Fig 1 performs input protection, level translation, isolation, and debouncing. The circuit allowed the output of a relay driver to connect to a computer even though the relay driver delivered a voltage as high as 24V and the relay driver had no ground connection. With the values in Fig 1 the low and high thresholds at the circuit's input were approximately 8 and 16V, respectively. The cutoff frequency was high enough to allow counting 1200 counts/min. The input withstood 110V ac continuously—the optoisolater's withstand voltage is 3 kV. I tested the debouncing function with a microswitch....    

Circuit Provides 4 to 20 Ma Loop for Microcontrollers:  05/27/2004  EDN-Design Ideas  The 4to 20-mA current loop is ubiquitous in the world of controls in manufacturing plants. Discrete logic, microprocessors, and microcontrollers easily cover the digital portions of control schemes, such as limit switches, pushbuttons, and signal lights. Interfacing a 4to 20-mA output to a rudimentary microcontroller can be problematic. (added 10/05)

Circuit Translates TTY Current Loop to RS-232C:  08/03/98 EDN Design Ideas  / (added 3/03)   -Provides signal translation between a passive current-loop (TTY) interface and a duplex RS-232C ports

CLC030 or CLC031 Control Port Bussed Operation:  National Semiconductor Application Note   (app note added 2/06)

Clock Performance in Raid Storage Applications: PI6c2502:  Pericom Semiconductor Application Note # 026 (app note added 2/05)

CMOS A/D Converter Interfaces Easily with Many Microprocessors:  National Semiconductor Application Note 04-Nov-1995 (app note added 6/06)

Combine Two 8 Bit Outputs to Make One 16 Bit Dac:  09/30/04   EDN-Design Ideas / (added 10/05)  Inexpensive, 16-bit, monolithic DACs can serve almost all applications. However, some applications require unconventional approaches. This Design Idea design concerns circuitry I recently designed for a tunable-diode laser spectrometer for a Mars-exploration application. The control circuitry included two 16-bit DACs ....

Commodore 64 24-Bit Parallel Port Interface with 8255:  (electronic circuit added 4/05)

Commonly Used RS-232 Serial Port Cables:  (design circuit added 8/02)

Compter microphone:  (diagram added 2/07)

Computer Controlled IR Device:  (electronic Circuit / Schematic added 10/04)

Computer Controlled Model Train Set:  (design circuit added 8/02)

Computer Microphone:  adapting electret microphone to soundcards with dynamic microphone inputs   (added 5/02)

Computerize Your Room/Home:  (circuit added 7/02)

Computerized Infrared Remote:  control your stereo, TV and VCR from Windows, includes schematic and software   (added 4/02)

Connect IEEE 488 Devices to Parallel Port:  07)/20/95 EDN-Design Ideas / (added 11/05)

Connect other circuits to PC joystick port:  (circuit added 2/07)

Connect Other Circuits to PC Joystick Port:  (schematic / circuit (added (6/03)

Connect Two CD ROM Drives to One Soundcard:  (design circuit added 8/02)

Connect two CD-ROM drives to one soundcard:  (electronic schematic added 1/07)

Connecting Sega 3D Glasses to a PC Serial Port:  (electronic circuit added 1/03)

Connector Adds Plug-And-Play Capability:  07)/04/96 EDN-Design Ideas / (added 1/06) 

Control 120VAC relay with TTL :  ASCII format (circuit design added 7/06)

Control a Processor's Power Supply in Real Time:  03/31/05 EDN Design Ideas  / (added 5/05)  Dynamic control of processor's supply rail minimizes power consumption.

Control Electrical Appliances using PC:  Here is a circuit for using the printer port of a PC, for control application using software and some interface hardware. The interface circuit along with the given software can be used with the printer port of any PC for controlling up to eight equipment . The interface circuit shown in the figure is drawn for only one device, being controlled by D0 bit at pin 2....  (added 09/05)

Convert Atari Style Joystick to PC Joystick Port:  (design circuit added 8/02)

Convert Ataristyle Joystick to PC Joystick Port:  (schematic / circuit (added (6/03)

Correlating software and analog outputs in a CAN controller:  Agilent Application Note   (app note added 6/06)