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Last Updated:  Monday December 25, 2017 01:47:38 PM

Circuits Designed by Dave Johnson, P.E.

Negative 0.5 Volt SupplyThis 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 Johnson P.E.-July, 2006

Nine-Volt Battery EliminatorIf you use 9v battery powered devices for long periods of time, you may get tired of constantly changing batteries.  The circuit below can be wired into any 9v battery powered device, drawing power from an external AC to DC power adapter.  I designed the circuit. . . Circuit by David A. Johnson P.E.-December, 2009

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

Pass Regulator's Output Ranges From 0 to 20 -  04/13/95 EDN-Design Ideas Adjustable-voltage pass regulators normally allow the output infinite adjustment between some maximum VOUT and one bandgap voltage away from ground.  The internal bandgap reference for the error amplifier limits the minimum output voltage.  Some regulators have well-behaved, constant ground currents so that you can "float" the pass regulator on top of an adjustable resistor.  This scheme requires a relatively high quiescent current to swamp out the pass regulator's ground current. __ Circuit Design by Marvin Vander Kooi, Micrel Semiconductor  San Jose CA/

Pass Transistor Lowers Dropout Voltage -  02/18/99 EDN-Design Ideas NOTE :  File contains several circuits, please scroll to this this one.   With linear regulators,you measure dropout voltage, VIN–VOUT, at the minimum input voltage for which the IC sustains regulation.  Low dropout means longer battery life, because the load circuit continues to operate while the battery discharges to a lower terminal voltage__ Circuit Design by Matt Schindler, Maxim Integrated Products, Sunnyvale, CA

Peak Detector Operates From Single Supply -  05/12/94 EDN-Design Ideas The circuit in Fig 1  can detect the peak of either positive or negative inputs, yet it operates from a single supply. __ Circuit Design by Chester Simpson, National Semiconductor, Santa Clara, CA

Philips GM 6012 AF Millivoltmeter manual w/schematic -  vintage television (schematic)  __ Designed by Frank Pocnet

PLL-based converter controls light source -  EDN-Design Ideas July 2, 1998        [ NOTE : File has multiple design, scroll for this one.]  Using the circuit in Figure 1, you can digitally control the light intensity of a lamp.  The control loop is based on a PLL, in which the VCO comprises a light-to-frequency converter (TSL220) coupled to a light source that derives its drive from a switching regulator (L4970A).  __ Circuit Design by Masso Gottardi, ITC-IRST, Trento, Italy

Portable CD Player Adapter for Car -  Whenever I'm in the car listening to my favourite CD, it always happens-my batteries go dead.  To solve that problem, I built this extremely simple regulator circuit.  It steps down the 12V from the lighter socket to 9V which is used by the CD player __ Designed by Aaron Cake

Positive Regulator Makes Dual Negative-Output Converter -  06/26/03  EDN-Design Ideas Some systems, such as optical networks, requirethan one negative voltage.  A common procedure is to boost the main negative supply of -5V to -10V and then reduce it with a linear regulator to -9V.  The -5V itself comes from a positiv__ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Positive regulator makes negative DC/DC converter -  12/26/02 EDN-Design Ideas Power-supply designers can choose from a plethora of available positive buck regulators that can also serve as negative boost DC/DC converters.  Some buck regulators have a negative-feedback reference voltage expressly for this purpose, but ICs that have positive-reference feedback voltages far outnumber these negative-feedback regulators__ Circuit Design by Keith Szolusha, Linear Technology Corp, Milpitas, CA

Postregulation technique efficiently supplies multiple output voltages -  01/15/98  EDN-Design Ideas Various methods for regulating multiple-output power supplies exist.  An emerging technique--secondary-side postregulation, or SSPR--provIdeas advantages for high-frequency, high-power-density DC/DC converters.  Many electronic devices require two or more__ Circuit Design by Gedaly Levin, Cherry Semiconductor Corp

Power Supply (psu 1) -  One of the most useful circuits for the home constructor is the Power Supply Unit.  A transformer with tapped secondaries can give a range of output voltages for testing and operating home-made equipment. __ Designed by Harry Lythall-SM0VPO

Power Supply (PSU 3) -  I have done some work with DC PSUs over the past few months but some of the designs were either complex or "basic performers".  I therefore decided that it was about right to produce a bench PSU that was simple enough to be made into another kit and have a reasonable performance too. __ Designed by Harry Lythall-SM0VPO

Power Supply Converted from a PC link -  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

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

Power Supply Modules for the P54C-VR Pentiumr Microprocessor -  AN63  This App Note describes the design of both linear and switching regulators which provide power for 90MHz Pentium (r) processors.  The circuits are intended to comply with Intel's modular power supply specification and provide sufficient power for cache RAM and chip sets in addition to the CPU___ Linear Technology/Analog Devices

Powering a Fractional-N Voltage Controlled Oscillator (VCO) with Low Noise LDO Regulators for Reduced Phase Noise  -  The EVAL-ADF4350EB1Z board uses the standard ADF4350 programming software, contained on the CD that accompanies the evaluation board.  , Equipment Needed Windows® XP, Windows, Vista (32-bit), or Windows 7 (32-bit) PC with USB Port, the ADF4350EB1Z, the ADF4350 programming software, 5.5 V power supply, and a spectrum analyzer such as a Rhode and Schwartz FSUP26.  __ Analog Devices from the Lab

Power-Supply Failure Alarm -  Most of the power-supply failure indicator circuits need a separate power-supply for themselves.  But the alarm circuit presented here needs no additional supply source. __ Designed by M.K. CHANDRA MOULEESWARN

Power-Supply Tracks Control Input -  12/21/95 EDN-Design Ideas The power-supply circuit in Figure 1 tracks a control input whenever the input is between 5 and 5.7V, maintains a minimum output voltage of 5V whenever the control input is less than or equal to 5V, maintains a maximum output voltage of 5.7V whenever the control input is greater than or equal to 5.7V, and implements foldback current limiting such that IKNEE is approximately equal to 700 mA and ISC is approximately 0 mA__ Circuit Design by Tony Zizzo, Burr-Brown Corp Tucson, AZ

Precision Audio Millivoltmeter -  Measures10mV to 50Volt RMS in eight ranges Simply connect to your Avo-meter setAT 50µA range __ Contact: Flavio Dellepiane, fladello @ tin.it

Precision reference bans precision resistors -  06/10/99 EDN-Design Ideas Combining a switched-capacitor charge pump with a precision reference yields an inverted reference from a positive power supply__ Circuit Design by Budge Ing, Maxim Integrated Products, Sunnyvale, CA

Proportional thermoregulator synchronizes to line -  04/13/00 EDN-Design Ideas The circuit in Figure 1 is a proportional thermoregulator in which the switching of the TRIAC occurs when the mains voltage crosses the zero level.  As a result, the circuit generates no RFI.  The circuit can easily achieve linear regulation and perfect isolation between the control and power sections.  Whenever the mains voltage crosses zero, a 1-msec positive pulse appears at the collector of Q 1 .  __ Circuit Design by Jordan Dimitrov

Protection Feature Enhances Boost Converter -  10/27/94 EDN-Design Ideas A boost-topology switching regulator is the simplest solution for converting a twoto three-cell input to a 5V output.  Unfortunately, boost regulators have several inherent disadvantages, including a lack of short-circuit protection and shutdown capability.  In some battery-operated__ Circuit Design by Dimitry Goder, Linear Technology Corp, Milpitas, CA

Provide ADSL Frequency Reference -  05/25/00 EDN-Design Ideas The discrete-multitone (DMT) frequencies that asymmetrical-digital-subscriber lines (ADSL) use are integral multiples of a common frequency, and the symbol period is the inverse of this frequency.  Integration over the symbol period allows the sine and cosine orthogonal waveform products to vanish for all multiples of the common frequency except for those having the same frequency.   __ Circuit Design by Bert Erickson, Fayetteville, NY

Provide Leading-Edge Blanking -  05/29/03  EDN-Design Ideas In isolated switch-mode power supplies using peak-current-mode control, generally the current-sense resistor senses the current on the primary side of the power converter.  Figure 1 shows a typical circuit, in which R2 is the curren__ Circuit Design by Michael O'Loughlin, Texas Instruments, Dallas, TX

Provide Reference for Multiple ADCS -  24-Jan-02 EDN-Design Ideas The achievable accuracy for systems with multiple ADCs depends directly on the reference voltages applied to the ADCs.  Medical-ultrasound-imaging systems, for example, commonly include a large number of ADCs in the system's beam-former electronics, with the ADCs usually organized in groups of 16, 24, 32, and so on__ Circuit Design by Ron Gatzke and Tanja Hofner, Maxim Integrated Products, Sunnyvale, CA

Pushbutton replaces rotary switch -  26-Oct-00 EDN-Design Ideas The problem of setting any one of four modes of aµC-operated process has a straightforward solution  Have the µC check the states of some 4 bits of aµC.   __ Circuit Design by Abel Raynus, Armatron International Inc, Melrose, MA

PWM IC makes synchronous gate driver -  02/02/99 EDN-Design Ideas (contains several designs, scroll to find this one)   A system with a µP, memory, and peripherals usually requires several power-supply voltages.  Designers typically use local switching regulators to produce the desired voltage rails.  One of the most common topologies, the synchronous buck regulator, converts a 5 or 12V bus to some other, lower voltage.  __ Circuit Design by Dimitry Goder, Switch Power Inc, Campbell, CA

Quad Output Switching Converter Provides Power for Large TFT LCD Panels -  DN349 Design Notes___ Linear Technology/Analog Devices

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