Program flags dangerous DOS commands:  02/02/95 EDN-Design Ideas / (added 11/05)

Program generates Braille dot code :  12/19/96 EDN-Design Ideas / (added 11/05)

Program helps convert OrCAD libraries:  09/14/95 EDN-Design Ideas /  (added 11/05) 

Program Matches filter network impedances:  07/20/95 EDN-Design Ideas / (added 11/05)

Program predicts VSWR mismatch RF uncertainties:  02/01/01 EDN-Design Ideas / (added 11/05)

Program provides integer-to-binary conversion :  03/02/98 EDN-Design Ideas  / (added 11/05)   

Program provides ISA bus DLL for Windows #1:  09/28/95 EDN-Design Ideas / (added 11/05) 

Program provides ISA bus DLL for Windows #2:  05/09/96 EDN-Design Ideas / (added 11/05) 

Program Turns PC sound card into a function generator:  09/2/99 EDN Design Ideas /  (added 11/05)

Programmable charger fills capacitor banks :  10/08/98 EDN-Design Ideas  / (added 11/05)   

Programmable Clock Oscillator #1:  PIC-Tock video clock using a PIC16C61.  Voltage controller oscillator that was designed as a wide range oscillator to generate clock pulses for a stepper motor drive system, frequency could be varied over1,000,000:1  (added 11/05)

Programmable Clock Oscillator #2:  PIC-Tock video clock using a PIC16C61  (added 11/05)

Programmable Current source powers charger:  06/22/95 EDN-Design Ideas / (added 11/05)

Programmable diode biases bridge:  03/17/94 EDN Design Ideas /  (added 11/05)

Programmable divider restores SVGA pixel clock:  03/28/96 EDN-Design Ideas / (added 11/05) 

Programmable filter uses parallel processing:  05/23/96 EDN-Design Ideas / (added 11/05) 

Programmable gain Amplifier is Low cost #1:  01/18/01 EDN - Design Ideas /  (added 11/05)  Numerous programmable-gain amplifiers are available, but a simple solution provides the option of using 256 gain steps with an 8-bit DAC and higher steps with higher bit DACs (Figure 1). According to the inverting-amplifier configuration of an op amp, the output voltage is VOUT=VIN(RF/RIN), where RF is the feedback resistance, RIN is the input resistance, and VIN is the input voltage of the amplifier circuit. Generally, by changing the feedback resistance, you can get the desired gain.

Programmable Gain Amplifier is Low Cost #2:  03/17/1994 EDN Design Ideas /  (added 11/05) A programmable reference diode, such as the Motorola TL431A, can supply constant-current bias for a silicon pressure-sensor bridge (Fig 1). This circuit is simpler than using an op amp and separate reference diode or than using a current diode, which requires temperature compensation. The TL431A produces a VREF of 2.5V over a current range of 1 to 100 mA. The value of VREF/R2 sets the necessary bias current for the bridge sensor, as specified by the sensor manufacturer. The reference diode current, set....

Programmable impedance has 12-bit resolution:  05/23/96 EDN-Design Ideas / (added 11/05) 

Programmable Oscillator uses digital potentiometers:  03/07/02 EDN Design Ideas  /   (added 11/05)  Digital potentiometers are versatile devices; you can use them in many filtering and waveform-generation applications. This Design Idea describes an oscillator in which setting the resistance of two digital potentiometers independently programs the oscillation amplitude and frequency. Figure 1 shows a typical diode-stabilized Wien-bridge oscillator that generates accurate sine waves fro... ...

Programmable Power Supplies - App Note 7:  Apex Microtechnology Corp - App Note - (Circuit / schematic design added 6/06)

Programmable Ramp Generator has 14 Bit Linearity:  09/12/96 EDN-Design Ideas /  (added 11/05)  This linear ramp generator uses a DAC, a transistor array, MOSFET switches, and current-steering techniques to achieve 14-bit linearity (Figure 1). The output current of IC1, a DAC-10, is a product of the digital code and the reference-current input, where IO=(code/1024)×2IR. IR is the output of reference IC6 divided by R1. Q1A, Q1B, and Q1C of the CA3096 transistor array form the current sink and share the IO current from the DAC. Q1A simply scales the current by shunting one-third of IO. The pnp transistors of the same array, Q1D and Q1E, mirror the sink current to form a current source of the same magnitude. The slope input signal drives optocoupler IC4, which isolates....

Programmable source powers dc micromotors:  03/01/01 EDN-Design Ideas / (added 11/05) A simple, economic, compact, and tricky way of using the LM723 as a programmable voltage source to drive dc micromotors which can set the output to a value of200 mV to 6V