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Converters Voltage
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Last Updated:  Saturday December 30, 2017 02:25:44 PM

Circuits Designed by Dave Johnson, P.E.

RS-232 Serial Interface Status Indicator CircuitI designed this circuit many years ago and have used it several times since.  It uses a single logic IC to indicate the TXD and RXD line activity of a typical RS-232 serial data communications link.  The thresholds are set at plus 3 volts and minus 3 volts.  Two dual color LEDs are used as indicator lights . . . Hobby Circuit designed by Dave Johnson P.E.-December, 2007

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

Touch Switch 240VA - CThis is another capacitance based touch on/touch off switch, which can control power to a 200 watt 240vac load . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002

Voltage BoostIn this design a marginal AC to DC linear power supply provides a voltage boost, so it can maintain regulation at low line voltages.  The added components are wired at the AC input and the + DC output of an existing bridge rectifier circuit.  The components act as a full wave “charge pump” which will boost the DC output voltage across the main filter capacitor C3.  Without the boost circuit, when the AC line voltage drops to 105vac, the DC output voltage only reaches 11.5 volts, too low for a 12v voltage regulator. . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Voltage Converters-0.5 to 6 VoltsConventional silicon transistors just can't operate at voltages less than about 0.7v.  Old germanium transistors could be used, but those are hard to find these days and most are rather large in size.  Some new n-channel MOSFET devices with very. . . Circuit by Dave Johnson P.E.-May, 2007


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

UCC3809 Evaluation Module -  The UCC3809EVM evaluation module is an isolated 10-W, 3.3 -V converter designed for telecom input voltages, nominally -48 Vdc, but ranging from -32 Vdc to -75 Vdc.  The UCC3809 economy primary-side controller is used as the pulse-width modulator (PWM) , combined with a TLV431 low-voltage adjustable-precision shunt regulator on the secondary side __

UCC3819 250-W PFC Boost follower PreRegulator Design -  This is an App Note that describes a reference design.  This paper reviews the benefits of a boost follower topology and the design of a 250-W PFC boost follower preregulator.   __

UCC38C42 25-Watt Self-Resonant Reset Forward -  This is an App Note that describes a reference design.  This reference design presents a self-resonant reset forward converter using the UCC38C42 BiCMOS Low-Power Current-Mode PWM Controller.  The input voltage for this converter is compatible with the telecom input voltage range of 36 VDC to 72 VDC.  The converter is designed to operate at a switching __

Ultra Low Drop Linear Regulator -  The circuit is a MOSFET based linear voltage regulator with a voltage drop of as low as 60 mV at 1 ampere.  Drop of a fewer millivolts is possible with better...___ Electronics Projects for You

UltraFast Linear Regulator Eliminates All Bulk Tantalum & Electrolytic Output Capacitors -  DN157 Design Notes __ Linear Technology/Analog Devices

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

UltraLow Noise Switching Power Supplies Simplify EMI Compliance -  DN316 Design Notes___ Linear Technology/Analog Devices

Ultra-low-noise low-dropout regulator achieves 6-nV/√Hz noise floor -  06/23/05  EDN-Design Ideas LDO has ultralow-noise output__ Circuit Design by Ken Yang, Maxim Integrated Products Inc, Sunnyvale, CA

Universal DC-to-DC Converter -  This circuit will generate a smaller DC output voltage from a larger DC input voltage.  It is quick and simple to make and by changing the value of the zener diode, the circuit can be universally adapted to provide other output voltages.  The circuit and all diagrams represent a DC convertor with 12V battery input and 9Volt DC output __ Designed by Andy Collison

Universal Input 48W PFC Application -  The LT3798 is a constant voltage/constant current isolated flyback controller that combines active power factor correction (PFC) with no opto-coupler required for output voltage feedback into a single-stage converter.  A LT3798 based design can achieve a power factor of greater than 0.97 by actively modulating the input current, __ Linear Technology/Analog Devices App Note, Dec 5th 2011

Universal Power Supply -  Linear regulators like LM317, LM337, 78xx and 79xx, Zener diodes (1.3W) and reference diodes (e.g., LM336) are quite inexpensive and widely available.  So you can use these liberally in power supplies.  Sometimes...___ Electronics Projects for You

Universal PS - U -  A Universal Power supply based on the L200 regulator, which includes an outboard pass transistor to boost output currents up to 4 amps.   __ Designed by Volker Jeschkeit

Universal Voltage Regulator Board -  Digital/Analog USB Data Logger, Pt.3___ SiliconChip

Use a 555 timer as a switch-mode power supply -  14-Nov-02 EDN-Design Ideas Most switch-mode power supplies rely on a PWM(pulse-width-modulated] output that is controlled via voltage feedback.  A 555-timer IC can inexpensively perform PWM.  The circuit in Figure 1 shows how to turn a 555 PWM circuit into an switch-mode power supply with only one simple equation.  The design uses two 555s__ Circuit Design by Aaron Lager, Masterwork Electronics, Rohnert Park, CA

Using a PC power supply as a benchtop power supply -  This ATX PS board has leads for +5 (RED) , -5 (WHITE) , +12 (YELLOW) , -12 (BLUE) volts, Ground (BLACK) and switch (GREEN).  Dell power supplies manufactured between 1996 and 2000 do not follow the industry standard pinout and color codes.  The fan has also been unplugged for better viewing.  Since this PS was converted for use in the logic and robotics labs, the selected voltages  __ Designed by Andy Batts

VFD (Vacuum Fluorescent Display) Flyback Power Supply -  The LT3758 is a wide input range, current mode, DC/DC controller which is capable of generating either positive or negative output voltages.  It can be configured as either a boost, flyback, [Linear Technology, SepIC or inverting converter.  The LT3758 drives a low side external N-channel power MOSFET from an internal regulated 7.2V supply.  The___ Linear Technology/Analog Devices App Note, Jan 16th 2012

Voltage Boost -  In this design a marginal AC to DC linear power supply provides a voltage boost, so it can maintain regulation at low line voltages.  The added components are wired at the AC input and the + DC output of an existing bridge rectifier circuit.  The components act as a full wave “charge pump” which will boost the DC output voltage across the main filter capacitor C3.  Without the boost circuit, when the AC line voltage drops to 105vac, the DC output voltage only reaches 11.5 volts, too low for a 12v voltage regulator. . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006

Voltage Converter -  Similar to the system used in modern aviation where an antenna array modulates the phase of an incoming signal.  The commercial system is known as Commutated Aerial Direction Finding (CADF) where a ring of 18 identical antennas are each switched on in sequence, just like winding a rotary switch round and round so that one antenna is always connected to the receiver.   __ Designed by Harry Lythall-SM0VPO

Voltage Converters-0.5 to 6 Volts -  Conventional silicon transistors just can't operate at voltages less than about 0.7v.  Old germanium transistors could be used, but those are hard to find these days and most are rather large in size.  Some new n-channel MOSFET devices with very. . . Circuit by Dave Johnson P.E.-May, 2007

Voltage Difference Magnifier -  NOTE : Must register on this site __ Designed by Published in Elecktor July/Augu, 2010

Voltage doubler -  this circuit rougly doubles the voltage of the input, however the current output is low.  doubled output is at 'V source.  '  __ Designed by Andy Wilson

Voltage doubler improves accuracy -  5-Feb-09 EDN-Design Ideas A transistor's low saturation voltage results in less loss__ Circuit Design by S Chekcheyev, Tiraspol, Moldova

Voltage Doubler uses Inherent Features of Push-Pull DC/DC Converter -  08/16/07 EDN-Design Ideas Paralleled Darlingtons drive a wide-range voltage doubler__ Circuit Design by Ajoy Raman, Aeronautical Development Establishment, Bangalore, India

Voltage Level Translator-23001.0  -  Circuit Ideas for Designers App Note___ Advanced Linear Devices, Inc

Voltage Level Translator-23002.0  -  Circuit Ideas for Designers App Note___ Advanced Linear Devices, Inc

Voltage Limiter Generates Supplies that Improve Standard Diode Technique -  Some systems require a voltage limiter to protect the input circuit.  Designers can connect diodes to V CC and Gnd to create a simple solution (Fig.1).  This simplicity, however, comes at a __ Designed by Yossi Barkan

Voltage Reference Collection -  AN42 A wide variety of voltage reference circuits are detailed in this extensive guidebook of circuits.  The detailed schematics cover simple and precision approaches at a variety of power levels.  Included are 2 and 3 terminal devices in series and shunt modes for positive and negative polarities___ Linear Technology/Analog Devices

Voltage reference improves JFET -  26-Oct-00 EDN-Design Ideas The common JFET current-source in Figure 1a has average output impedance and depends heavily on the JFET's VP and IDSS variations.  These manufacturing variations limit the initial accuracy of the current setpoint that the circuit can obtain with a fixed R1.  Most users of JFET current-sources sample VPPDF has several circuits, scroll to find this one__ Circuit Design by Clayton Grantham, National Semiconductor, Tucson, AZ

Voltage reference is software-programmable -  08/18/05 EDN-Design Ideas Obtain extra reference voltages from existing ones__ Circuit Design by Reza Moghimi, Analog Devices, San Jose, CA

Voltage reference sets current limit -  11/19/98 EDN-Design Ideas NOTE :  File contain several designs.  Scroll to find this one.  Power op amps have a real need for active output-current limiting.  Most power-amplifier designs rely on the voltage drop across a user-supplied sense resistor to turn on an internal transistor.  This method has several drawbacks, notably, an inability to change the current-limit point under program control.  The current-limit circuit in Figure 1 allows you to establish the setpoint by applying a voltage to one of the amplifier's pins.__ Circuit Design by Joe Engle, Burr-Brown Corp, Tucson, AZ

Voltage Regulator -  This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation.  Aprroximately 0.7 Volts are dropped across the transistors b-e junction, leaving a higher current 12.3 Volt output supply.  This circuit can supply loads of up to 500 mA.  This circuit is also known as an amplified zener circuit __ Designed by Andy Collison

Voltage Regulator controls scanner Lamp brightness -  05/13/99 EDN-Design Ideas An image-scanning device performs best when the scanner IC controls the brightness of the image reflected into the light sensors.  The best way to control brightness is by adjusting the intensity, or light output, of the fluoresce__ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Voltage Regulator goes Digital -  11/24/99 EDN-Design Ideas Power consumption and failing batteries are key issues in battery-operated applications.  Features in the new generation of series voltage regulators address these concerns.  For example, National Semiconductor's LP2951 micropower voltage regulator provIdeas a logic-level output signal indicating a low regulated__ Circuit Design by Chuck Wojslaw, Xicor Inc, Milpitas, CA

Water Level Reference Design -  The Water Level Reference design continuously monitors water level and water flow using the temperature compensated MPXM2010GS pressure sensor in the low cost MPAK package, a dual op–amp, and the MC68HC908QT4, 8–pin microcontroller.  This system uses very few components, reducing the overall system cost.   __ Designed by Freescale

Wide Input Range High Efficiency DDR Termination Power Supply Achieves Fast Transient Response -  DN281 Design Notes___ Linear Technology/Analog Devices

Wide-range regulator Delivers 12V, 3A output from 16 to 100V source -  06/23/05  EDN-Design Ideas Buck regulator tackles high input voltages__ Circuit Design by Wayne Rewinkel, National Semiconductor, Schaumburg, IL

Wide-range voltage regulator automatically selects operating-mode -  06/09/05  EDN-Design Ideas Regulator seamlessly adapts to wide output range__ Circuit Design by Joel Setton, Crolles, France

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


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