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Programmable Device
Codes, Page 3
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Page 3
Last Updated on:
Friday, March 12, 2010 12:07 PM |
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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Programable LCD counter with memory backup - This counter based on AT90S1200A
its programmable and when shut it down its keeping the current counts to the
memory, until to the power on.….(circuit design added 03/09) |
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Programmable analog circuits yield single chip sinusoidal oscillators -
01/19/06 EDN-Design Ideas: Internally programmed low-pass filters yield classic RC
oscillator.....(design idea added 2/06) |
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Programmable charger fills capacitor banks - 10/08/98 EDN-Design Ideas:
(design idea added 11/05) |
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Programmable Clock Oscillator - 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 4/02) |
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Programmable Current source powers charger - 06/22/95 EDN-Design
Ideas:.....(design idea added 11/05) |
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Programmable current source requires no power supply - 06/12/08 EDN-Design
Ideas: A programmable current source is useful for creating I-V curves, charging
and discharging batteries, preloading power supplies, and many other
applications.....(design idea added 09/08) |
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Programmable Digital Code Lock - Schematic/circuit (added 11/05) |
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Programmable diode biases bridge - 03/17/94 EDN-Design Ideas: (design idea
added 11/05) |
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Programmable divider restores SVGA pixel clock - 03/28/96 EDN-Design Ideas:
(design idea added 11/05) |
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Programmable filter uses parallel processing - 05/23/96 EDN-Design Ideas:
(design idea added 11/05) |
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Programmable Gain Amplifier is Low Cost - 01/18/01 EDN-Design Ideas: 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),.....(design idea added 09/05) |
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Programmable Gain Amplifier is Low Cost #2 - 03/17/94 EDN-Design Ideas: 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.....(design idea added
11/05) |
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Programmable impedance has 12 bit resolution - 05/23/96 EDN-Design Ideas:
(design idea added 11/05) |
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Programmable LED Flashers - LED goes to steady state after a preset number of
flashes. Two simple, wide supply range operating circuits. (schematic
added 6/07) |
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Programmable Oscillator uses Digital potentiometers - 03/07/02 EDN-Design
Ideas: 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.....(design idea
added 11/05) |
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Programmable Ramp Generator has 14 Bit Linearity - 09/12/96 EDN-Design Ideas: 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.....(design idea added 11/05) |
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Programmable source powers DC micromotors - 03/01/01 EDN-Design Ideas: 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.....(design
idea added 11/05) |
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Programmable Timer for Appliances - circuit (added 11/05) |
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Programmed reference oscillator generates nonstandard clock frequencies -
04/279/06 EDN-Design Ideas: (design idea added 09/06) Small assembly-language
process exploits equalized, fixed-length branch loops with only 12 instructions. |
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Programmer PIC16F84,12C50x & EEPROM 24Cxx - circuit (added 11/05) |
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Programmer PIC16F84,12C50x & EEPROM 24Cxx geocities - Electronic circuit (added
11/05) |
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Programs calculate 1% & ratio resistor pairs - 12/16/05 EDN-Design Ideas: Computer
programs determine the best values for an application.....(design idea added 05/06/07) |
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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,.....(design idea added 11/05) |
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Software avoids interrupt overhead - 03/02/00 EDN-Design Ideas: (design idea added
11/05) |
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Software configures IBM PC interrupts - 11/10/94 EDN-Design Ideas: (design idea
added 11/05) |
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Software implements Digital potentiometer - 06/08/95 EDN-Design Ideas:.....(design
idea added 11/05) |
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Software makes full use of 8051's interrupt system - 12/06/01 EDN-Design Ideas:
The program in Listing 1 uses a pseudo-RETI instruction to provide a
five-priority-level interrupt system for the 8051P microcontroller. The
interrupt-priority order, from high to low, is INT0 IT0 INT1 IT1 INTP. Before the
pseudo-RETI instruction arrives in the IT0 or IT1 interrupt-service routine, the
address of the first.....(design idea added 11/05) |
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Software PLL locks VCXO to reference - 08/03/98 EDN-Design Ideas: (design idea
added 2/06) |
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Software reset uses I²C I/O Port - 05/16/02 EDN-Design Ideas: You can use the
circuit in Figure 1 to allow the I2C or SMBus to control device resets in a system by
using the PCA9554 I2 C I/O-port IC. Normally, a reset function takes an active-low
signal. On power-up of the PCA9554, the IC sets all the I/O pins as inputs. The 4.7-kΩ
pull-down resistor on each I/O.....(design idea added 11/05) |
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Software routine minimizes large logic tables - 07/03/97 EDN-Design
Ideas:.....(design idea added 11/05) |
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Software routine stabilizes hardware register - 07/18/96 EDN-Design Ideas:
(design idea added 11/05) |
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Software Snippet Provides Improved Subset Sum Algorithm - 09/25/03 EDN-Design
Ideas: The subset-sum problem is one of the most frequently occurring NP
(nondeterministic, polynomial-time)-complete)problems. It asks whether a subset of
numbers in a set of positive integers adds up exactly to a given value. A relaxed
version of the problem tries to identify a subset of numbers that adds up to a
maximum.....(design idea added 10/03) |
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Software speeds 8051 RS232C receiver - 12/04/97 EDN-Design Ideas: (design idea
added 11/05) |
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USB to RS232 Dongle - With serial and parallel ports being phased out on new
computers, hardware designers and hobbyists have no choice but to convert the USB port
back to RS232 serial. FTDI have a very nice chip that does just that, the FT232AM.
This chip converts USB to a standard high-speed serial port. The bonus with FTDI is
the drivers are already written for you. All you have to do is design the hardware and
download the serial USB drivers from FTDI's web site. ….(electronic schematic added
11/08) |
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Voltage Reference is software Programmable - 08/18/05 EDN-Design Ideas: Obtain
extra reference voltages from existing ones.....(design idea added 11/05) |
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