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Converters Voltage
Power Supplies -- Main Page           Converters -- Main Page

Voltage Converters:  #'s - B      C - K      L - Q      R - Z

Last Updated:  Tuesday October 24, 2017 02:54:41 PM

Circuits Designed by Dave Johnson, P.E.

Servo Pulse to Voltage ConverterA while back a Discover Circuits visitor needed a way to convert servo pulses from a radio controlled device into a voltage.  The drawing below, illustrates the pulse train of the received signal.  The time between pulses is a fixed 20ms while the pulse widths vary from a low of 1ms to a high of 2ms . . . Hobby Circuit designed by David Johnson P.E.-August, 2005

Simple Circuit Negative Supply CircuitThis simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Safe Hot Swapping using the LTC1421 -  DN139 Design Notes __ Linear Technology/Analog Devices

Scheme Adds Sequencing & Shutdown Control to Regulator -  10/30/03  EDN-Design Ideas Modern microprocessor- or FP-GA-based circuits require separate and independent power-supply voltages for the core and the I/O circuits.  Some devices require stringent control of the turn-on characteristics and sequencing of these __ Circuit Design by Said Jackson, Equator Technologies Inc, Campbell, CA

Secondary Side Dual Output Controller Tightly Regulates Two Isolated Outputs -  DN1000 Design Notes __ Linear Technology/Analog Devices

Self switching Power Supply -  One of the main features of the regulated power supply circuit being presented is that though fixed-voltage regulator LM7805 is used in the circuit, its output voltage is variable.  This is achieved by connecting a potentiometer between common terminal of regulator IC and ground.  For every 100-ohm increment in the in-circuit value of the resistance of potentiometer VR1,  __

Self-modifying code extends addressing Mode -  12/17/98 EDN-Design Ideas As just about any assembly-language programmer knows, self-modifying code (SMC) is usually undesirable, unintentional, and destructive.  However, the SMC routine in Listing 1 is extremely useful to extend the indexed, 16-bit offset addressing mode of the venerable HC05 µC from 8 bits, or 256 locations, to the full 13-bit (8-kbyte) memory address space that the µC’s architecture supports.  This routine is very useful for error tables, text messages tables, or any array manipulation for a large number of elements.   Circuit Design   Paul Sofianos, Motorola Inc, Tempe, AZ

Series Regulator with Q900 -  This is a series regulator with Q900 being the control element, Q901 a driver, and Q902 an error amp.  ZD900 forms the emitter reference voltage source.  Since the generated high voltage and other voltages are linked by means of the magnetic field of T900, any change in H.  V.  will be reflected back to all of the other voltages.   __ Designed by Chris Candreva

Serves as milliohmmeter -  04/15/04 EDN-Design Ideas When I was recently debugging a design, I discovered that a short circuit existed from a ground plane to a power plane.  I did not have access to a milliohm meter or an equivalent tester for locating this type of short circuit.  So, I logged onto the Internet to find an easily constructible milliohm meter__ Circuit Design by AM Hunt, Lancaster Hunt Systems Ltd, Shepperton, UK

Servo loop improves linear-regulator efficiency -  8-Jul-04 EDN-Design Ideas Linear regulators are easy to implement and have better noise and drift characteristics than switching approaches.  Their largest disadvantage is inefficiency  excess energy dissipated as heat.  Several well-known techniques are available to minimize the input-to-output voltage across a linear regulator__ Circuit Design by Aurel Gontean, Technical University, Timisoara, Romania

Servo Pulse to Voltage Converter -  A while back a Discover Circuits visitor needed a way to convert servo pulses from a radio controlled device into a voltage.  The drawing below, illustrates the pulse train of the received signal.  The time between pulses is a fixed 20ms while the pulse widths vary from a low of 1ms to a high of 2ms . . . Hobby Circuit designed by David Johnson P.E.-August, 2005

Shunt regulator eases power-supply-start-up woes -  10/27/05  EDN-Design Ideas Ensure regulator start-up under light output load__ Circuit Design by Michael O'Loughlin, Texas Instruments, Nashua, NH

Shunt regulator provides overvoltage protection -  01/15/98 EDN-Design Ideas The circuit in Figure 1 uses a typical technique for varying the output voltage of a power supply via a programmable control voltage.  Although the topology and schematic details of the power supply are not critical, the protection technique is noveThis File contains several Design Ideas, please scoll to this one[This design idea by ROBERT N BUONO, MAHWAH, NJ]__ Circuit Design by ROBERT N BUONO, MAHWAH, NJ

Shunt regulator serves as inexpensive Op Amp in power supplies -  09/15/05 EDN-Design Ideas Use low-cost power-regulator IC to replacecostly op amp in power supplies__ Circuit Design by Michael O'Loughlin, Texas Instruments, Nashua, NH

Shunt regulator speeds power supply's start-up -  12/16/05 EDN-Design Ideas Reconfiguring the start-up shunt regulator can reduce bootstrap time__ Circuit Design by Michael O'Loughlin

Signal Conditioning & Power Conversion -  AN75 Linear Technology This publication includes designs for data converters and signal conditioners, transducer circuits, crystal oscillators and power converters.  Wideband and micropower circuitry receive special attention.  Tutorials on micropower design techniques and parasitic effects of test equipment are included.  __ Linear Technology/Analog Devices

Simple Circuit +5V power supply -  This circuit is a small +5V power supply, which is useful when experimenting with digital electronics.  Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket.  Those transformers are easily available, but __ Designed by Tomi Engdahl

Simple Circuit +5V Power Supply -  In this tutorial we make a simple 5V DC power supply from initial idea to finished product.  This is not an exercise in making a flash power supply, just solving a problem with the parts at hand.   __ Designed by John Boxall

Simple Circuit DC/DC converter increases available power in dual voltage systE - M -  8-Jan-04 EDN-Design Ideas The schematic in Figure 1 shows a way to increase the power available from a current-limited 5V supply by adding power from a -5V supply.  The DC/DC converter generates a single 12V, 150-mA(1.8W] output from two regulated and current-limited input sources at 5V, 300 mA(1.5W] and -5V, 300 mA(1.5W]__ Circuit Design by David Kim, Linear Technology, Milpitas, CA

Simple Circuit High Efficiency Step-Down Switching Regulator -  DN73 Design Notes___ Linear Technology/Analog Devices

Simple Circuit Negative Supply Circuit -  This simple circuit consists of two LEDs and a photo diode.  It generates a negative voltage with a current level of a couple milliamps.  It is ideal for supplying a negative rail to low power “rail to rail” op amp circuits, which need to have a true zero volts output.  Note:  This circuit is not particularly efficient . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

Simple Circuit regulated power supply with overcurrent trip -  Here's a circuit for a relatively simple regulated power supply which has well controlled characteristics, including a clever over-current trip.   __ Designed by Richard Torrens

Simple Circuit Regulator Has One Active Part -  03/16/95 EDN-Design Ideas The regulator of unusual simplicity (ROUS) in Fig 1 derives a low-voltage, low-current output from rectified 115 to 270V ac.  Pass transistor Q1 is the regulator's only active component.   __ Circuit Design by Kennan C Herrick, ESI Electronics Corp San Francisco, CA

Simple Circuit regulator Monitors its input voltage -  09/12/97 EDN-Design Ideas Two- and three-cell portable systems, such as medical sensors, often monitor their battery input to obtain an early warning of a loss of battery voltage.  Typically, this warning is a digital signal that a comparator generates and then sends to the microcontroller.  The circuit in Figure 1 presets one side of a dual linear regulator to generate 2.84V at 100 mA.  The other side operates open loop, as a comparator, to generate the low-battery warning.  Both sIdeas are capable of delivering 100- mA output current.  Resistors R1 and R2 determine the low-battery threshold, according to__ Circuit Design by Larry Suppan and Luong Huynh, Maxim Integrated Products, Sunnyvale, CA

Simple Circuit regulator provides ±12V -  10/23/97 EDN-Design Ideas Simple circuit can provide ±12V from a5V input using only one switching-regulator IC and a few off-the-shelf__ Circuit Design by Musiri Shrivathsan, National Semiconductor Corp, Santa Clara, CA

Simple Circuit serves as milliohmmeter -  04/15/04 EDN-Design Ideas When I was recently debugging a design, I discovered that a short circuit existed from a ground plane to a power plane.  I did not have access to a milliohm meter or an equivalent tester for locating this type of short circuit.  So, I logged onto the Internet to find an easily constructible milliohm meter__ Circuit Design by AM Hunt, Lancaster Hunt Systems Ltd, Shepperton, UK

Simple Circuit Switching Regulator -  NOTE : Scroll downWhen batteries are used to power lower voltage circuits, a switching regulator is desirable to conserve battery life. There are excellent ICs that can do the job with great efficiency and small size. An example is the Maxim (www.maximic.com) MAX639 which converts inputs from 5.5 to 11.5 volts to 5 volts at up to 225mA.  The only additional parts are an inductor, schottky rectifier and a couple of capacitors. The following circuit is a discrete switcher similar in power handling capability to the MAX639. __ Contact: Charles Wenzel of Wenzel Associates, Inc.

Simple Circuit technique improves transient Dynamics -  06/24/99 EDN-Design Ideas Designing low-voltage, high-current converters with fast dynamic performance places stringent demands on a system designer.  However, a simple technique reduces the peak voltage deviation and decreases the response time for a tran__ Circuit Design by Robert Sheehan, Linear Technology Corp, Milpitas, CA

Simple Circuit Ultra-Low Dropout Regulator -  DN32 Design Notes___ Linear Technology/Analog Devices

Simple Power Supply Fits Into Small Spaces -  11/13/03 EDN-Design Ideas The demand for negative-voltage power supplies is increasing with the popularity of applications for portable devices.  It can be expensive and relatively complicated to generate a negative supply from a positive input source, especially when the design requires both positive and negative outputs__ Circuit Design by Raymond Zheng, Linear Technology, Milpitas, CA

Single Cell Operation -  AN15 1.5V powered circuits for complex linear functions are detailed.  Designs include a V/F converter, a 10-bit A/D, sample-hold amplifiers, a switching regulator and other circuits.  Also included is a section of component considerations for 1.5V powered linear circuits.  __ Linear Technology/Analog Devices

Single-Pulse Voltage Multiplier -  09/18/03  EDN-Design Ideas It is sometimes necessary for a microcontroller to generate a pulse whose voltage is higher than the power-supply voltage of the microcontroller.  The circuit in Figure 1 allows you to generate 14V pulses from a 5V power supply.  An __ Circuit Design by Richard Cappels, Mesa, AZ

Solar Panel Regulator -  This handy solar panel regulator measures the voltage across your battery or the charging current and will disconnect the panel to stop overcharging.  It works with 12V or 24V systems and has a 3.5-digit liquid crystal display.___ SiliconChip

SOT-23 Switching Regulator with Integrated 1A Switch Delivers High Current Outputs in a Small Footprint -  DN232 Design Notes___ Linear Technology/Analog Devices

Step-Down Switching Regulators -  AN35 Discusses the LT107) 4, an easily applied step-down regulator IC.  Basic concepts and circuits are described along with more sophisticated applications.  Six appended sections cover LT107) 4 circuitry detail, inductor and discrete component selection, current measuring techniques, efficiency considerations and other topics (appnote 2/06) __ Linear Technology/Analog Devices

Stereo-amplifier IC's outputs drive multiple loads -  11/21/05  EDN-Design Ideas Reference provIdeas constant bias voltage regardless of supply-voltage variations__ Circuit Design by Jean-Jacques Avenel, Maxim Integrated Products, Lesigny, France

Supply Delivers Pin-Programmable Multiple References -  1-May-03 EDN-Design Ideas In the circuit of Figure 1, the REF01, IC1, is a buried-zener-diode-based, precision 10V reference that features minimal noise and drift over temperature.  The circuit provIdeas not only the 10V output of the REF01, but also a 5V output that a REF02 reference would deliver.  In addition, the circuit provIdeas -5V, -10V, and an unbalanced dual reference, the sum of whose voltages is precisely 10V__ Circuit Design by V Manoharan, Kochi, India

Supply Savess From Lax Predecessor -  11/23/94 EDN-Design Ideas The lab supply in Fig 1 automatically sets its output voltage to zero whenever you switch it on.  Thus, the lab supply can't fry your circuit if the previous user left the voltage turned up too high.  The circuit supplies 1 to 25V dc because it uses an LM317 regulator.  When you turn on the supply, the bridge develops__ Circuit Design by Tian Jin-gin, Taiyuan Semiconductor Factory, Taiyuan, Shanxi, China

Switch Mode DC Supply -  The switching power supply, shown in the schematic, provides12 volts, at10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit.  The supply was constructed in1984 and is variable frequency, as opposed to the pulse width modulator (PWM) controllers used today __ Designed by Michael Ellis

Switched-Capacitor IC & Reference Form Elegant –48 to +10V Converter -  04/24/03  EDN-Design Ideas A system designer must almost always face a trade-off in choosing the right part for an application.  The trade-off usually involves performance, price, and function.  An example is the issue of powering circuits from a telecom-voltage source.  Telecom systems almost exclusively use high-potential negative rails, such as -48V__ Circuit Design by Wallace Ly, National Semiconductor, Santa Clara, CA

Switching regulator 2 -  I introduce the switching regulator which used MC34063A of the MOTOROLA, Inc.  in this page.  This regulator is housed in the DIP (Dual In line Packge) with 8 pins.  The 1.5-A output current can be gotten without the heatsink in spite of this size.  The input voltage can be used from 3 V to 40 V and can do the function of the Step Up (making the output voltage which is higher than the input voltage) , the Step Down (making the output voltage which is lower than the input voltage) and moreover Inverting __ Designed by Seiichi Inoue

Switching regulator charges NiMH
batteries
-  12/21/00 EDN-Design Ideas Many NiMH
(nickel-metal-hydride) fast chargers use linear regulators, such as the LM317, in a current-source configuration with a charge-monitor IC.  This arrangement dissipates much heat and requires considerable heat sinking, ad__ Circuit Design by Jason Hansen and Jim Hill, On Semiconductor, Phoenix, AZ

Switching Regulator Collection -  AN30 Switching regulators are of universal interest.  has made a major effort to address this topic.  A catalog of circuits has been compiled so that a design engineer can swiftly determine which converter type is best.  This catalog serves as a visual index to be browsed through for a specific or general interest.  __ Linear Technology/Analog Devices

Switching Regulator Controls CCFT -  02/16/95 EDN-Design Ideas You can control the current in a cold-cathode fluorescent tube(CCFT]and, hence, its brightness with a switching-regulator IC__ Circuit Design by Doug Vargha, Maxim Integrated Products Sunnyvale, CA

Switching regulator drives robot Motor -  05/13/99 EDN-Design Ideas The circuit in Figure 1 shows an example of how you can use an integrated switching regulator(ISR] to efficiently vary the speed of a permanent-magnet dc motor.  In this application, the rotating head of a robot senses the presence of an oncoming object(perhaps a human].  If the robot senses an object, it slows the rotationPDF contains many circuits, scroll to find this one.   __ Circuit Design by Donald Comiskey, Power Trends Inc, Warrenville, IL

Switching regulator forms constant-current source -  05/30/02 EDN-Design Ideas Many applications require current sources rather than voltage sources.  When you need a high-current source, using a linear regulator is inadvisable, because of the high power dissipation in the series resistor.  To solve the wasted-power problem, you can use a switch-mode regulator.  The circuit of Figure 1 uses IC1, an LM2576 adjustable regulator__ Circuit Design by Stefan Strozecki, Institute of Telecommunications, bydgoszcz, Poland

Switching Regulator Generates Both Positive & Negative Supply with a Single Inductor: Design Notes Linear Technology -  DN47 Design Notes___ Linear Technology/Analog Devices

Switching Regulator Output goes BeLow VREF -  03/17/94 EDN-Design Ideas The feedback arrangement of typical switching regulators doesn't allow the regulated outputs to go lower than the reference voltage.  If you try to lower the output by modifying the feedback network, the compensation components the manufacturer recommends may no longer stabilize the regulator's error amplifier__ Circuit Design by Michael Keagy, Maxim Integrated Products, Sunnyvale, CA

Switching regulator turns into light source -  07/17/97 EDN-Design Ideas Simple external feedback circuit transforms a switching regulator into a constant-intensity light source__ Circuit Design by Donald V Comiskey Jr, Power Trends Inc, Warrenville , IL

Switching Regulators for Poets -  Linear Technology AN25 __ Designed by Jim WilliamsSep 2nd, 1987

Switching-regulator Design lowers noise to 100 µV -  12/04/97 EDN-Design Ideas Expending unconscionable amounts of bypass capacitors, ferrite beads, shields, Mumetal, and aspirin to ameliorate noise-induced effects is no longer the only way to tackle switching-regulator noise.  Using a low-noise IC, you can now design switching converters with only 100 mV of noise.  Size, output-flexibility, and efficiency advantages have made switching regulators common in electronic apparatus.  The emphasis on these attributes has resulted in circuitry requiring minimal board area and with 95% efficiency.  Although these advantages are welcome, they necessitate compromising other parameters.   __ Circuit Design by Design by Jim Williams, Linear Technology Corp

Switching-regulator supply provides low-noise biasing for varactor diodes -  11/09/00  EDN-Design Ideas Low-voltage systems often need a locally generated high voltage.  Even for an application as noise-sensitive as varactor-diode biasing, a carefully planned switching-regulator-based design and layout can provide the necessary bias voltage.  __ Circuit Design by Jim Williams and J Phillips and G Vaughn, im Williams, EDN's most revered contributor-At 63 years of age, Williams passed away in June 2011 after a stroke.

Synchronized Regulator Produces Coherent Noise -  03/17/94 EDN-Design Ideas By using a gated-oscillator architecture instead of a clocked-PWM one, gated-oscillator-type switching regulators permit high efficiency over extended ranges of output current.  This architecture eliminates the housekeeping currents associated with the continuous operation of fixed-frequency designs.  Gated-oscillator regulators simply self-clock at whatever frequency is necessary to maintain the output voltage.  Typically, loop-oscillation frequency ranges from a few hertz to the kilohertz region, depending on the load.   __ Circuit Design by Jim Williams, Sean Gold, and Steve Pietkiewicz, Linear Technology, Milpitas, CA

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Voltage Converters:  #'s - B      C - K      L - Q      R - Z

 


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