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292 results found, displaying items 201 - 220
NAND Gates Enable Trigger Lockout For 555 Timers
Applications of commercially available integrated timers, including the NE/SE555, are fairly limited when used in their monostable mode. This is due to their inability to function with all types of trigger pulses. These timers work perfectly and...
PMOS Transistor Guarantees Accurate Power-Up Sequencing
A TFT LCD panel requires three voltages: VDD, VON, and VOFF. VDD, typically 13 V, powers the video signal path. VON, usually 25 V, supplies the turn-on gate drive bias voltage for the TFT cell....
Design An Adaptable Power Supply For XENPAK
XENPAK is a multisource agreement (MSA) for a 10-Gbit transceiver package. As part of the XENPAK MSA, each XENPAK module requires input power from an adaptable power supply (APS) that resides on a backplane. ...
Protect MOSFET Driver From Reverse-Battery Connection
It's vital that MOSFET power-switch drivers be protected from a reverse-battery connection. A small rectifier diode can shield against reversed batteries. But that approach is generally unacceptable for systems whose battery life is crucial. For a 6-V...
Setup Bypasses The Problems Of Boot-Strap/Bias-Supply Circuits
In some power-supply applications, the pulse-width-modulator (PWM) controller is powered up from an auxiliary winding tapped off the power stages transformer (Fig. 1). This technique reduces power loss...
Voltage-To-Current Converter Works From A Single-Supply Rail
Voltage-to-current converters feeding to grounded loads often find their way into industrial measurements and control applications. The conventional textbook circuit needs both positive and negative-supply rails (...
Passive RC Filters Afford Low Cost And High Selectivity
At audio frequencies, LC filters were undesirable because of expensive and bulky inductors. Prior to the advent of solid-state active devices, passive RC filters were an audio design option. During the last 30 years, analog active RC filters and...
Simple Isolated Supply Design Suits Fixed-DC-Voltage Systems
Most high-voltage systems that include low-voltage ICs must inject isolated supplies into their setups. The design and implementation of these supplies is usually quite involved. However, a simple approach is possible for systems in which the...
For Just Pennies, Boost Current From Negatimve Linear Regulator
Adding four components to a negative linear regulator (U1 in the figure) increases the load current by 60%. The additional pass transistor and associated resistors cost less than $0.17 in 1000-unit...
Build A Smart Battery Charger Using A Single-Transistor Circuit
The following automatic battery-charger design is created with a circuit that could qualify as the simplest window comparator ever built around a single transistor (see the figure). It starts charging...
Power Supply Cuts Switching Noise In DDR Memory Systems
This design idea describes a unique, low-cost power-supply circuit for a double-data-rate (DDR) memory system. Conventional designs for DDR memories consist of a dual buck converter and a voltage reference. In contrast, this design replaces one buck...
One-Pin Keypad Interface Conserves Battery Power
This idea builds on a previous IFD, "Connect Any Keypad With Any Microcontroller Using Only One Pin" (electronic design, May 1, 1998, p. 126), where a 555 timer connects a keypad switch matrix to a microprocessor. The timer converts a...
Compact ±5-V High-Current Supply Uses One 1.25-MHz Switcher
Disk drives, ADSL modems, notebook computers, and other data-acquisition circuits require high-current, ±5-V power supplies with switching frequencies above 1.1 MHz to avoid interfering with noise-sensitive circuitry. A very simple, compact, and...
Eliminate Latching Current limit In Power Supplies
Most modern power-supply control ICs offer built-in overcurrent or short-circuit protection. While some overcurrent-protection schemes are latching, others are nonlatching. When the overcurrent trip level is reached in a latching controller, the...
Composite Amplifier Boosts Precision Of Programmable Voltage Source
Engineers often need dc voltage sources with very high precision and good resistive and/or capacitive load-driving capability for industrial applications. However, precision benchtop power supplies can be very expensive if high accuracy also is...
PLD Adds PWM Soft-Start Function To Switching Power Supplies
Switching converters sometimes use soft-start circuitry to reduce the large in-rush current that occurs when they first turn on. By employing a PLD, soft start can be added to power-supply controllers that don't natively support this function, but...
Maximize Battery Life And Minimize Replacements
Designers and consumers want to maximize battery life in portable and handheld applications—to avoid discarding batteries that contain useful life, and to minimize battery replacements. Small battery-powered devices with wall-adapter plug-ins...
PC-Controlled Current Source Supplies 100-V, 1-A, 16-Bit Pulses
The current source shown in the figure is designed to support toroidal-cavity nuclear-magnetic-resonance electrophoresis (TCNMRE) measurements of molecular electrical mobility in chemical samples. To do so,...
Digitally Adjust Regulator's Output Using A JFET Interface
Often, electronic systems are guaranteed to operate with any supply voltage, within a given VCC range. Testing these circuits requires a regulated voltage supply that can be automatically incremented, from a minimum to a certain maximum....
Detect Loop-Reverse Battery Conditions On A Telephone Line
Equipment connected to the public switched-telephone network (PSTN) sometimes needs to detect polarity reversals of the battery feed. One common application is the Direct-Inward-Dialing (DID) service that uses what is termed as "loop-reverse battery...
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