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Power Supplies:  DC to DC / Switch Mode and DC to DC Converters
Boost,    Buck,    Buck-Boost,    Switchmode

Power Supplies -- Main Page           Converters -- Main Page
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Last Updated: November 30, 2017 02:27 PM

Circuits Designed by Dave Johnson, P.E. :

 Digital noise generator - When you need to test an audio circuit with broadband noise, this circuit works great.  It uses just three inexpensive C-MOS ICs that generate a series of output pulses whose widths vary randomly.  I included a level control pot . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2000

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747

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

DAC Powered Charge Pump Varies Negative Rail -  App Note #203__ Maxim Integrated

Data line filtering -  Coilcraft RF Magnetics App Note- __ Designed by Coilcraft Power Magnetics Application Note

DC 12V to DC 50V Converter for Car -  This is DC to DC circuit for Car audio.12V input from car battery produces 50V DC.  Circuit uses TL072 IC and 2N3055 bipolar transistors.  __ 

DC Adapter Power Supply -  DC voltage "virtual earth" circuits __ Designed by Rod Elliott  ESP

DC Motor Reversing -  A DC motor reversing circuit using non latching push button switches.  Relays control forward, stop and reverse action, and the motor cannot be switched from forward to reverse unless the stop switch is pressed first __ Designed by Andy Collison

DC Power Supply -  Build a simple DC supply having three output terminals: regulated +5VDC, unregulated +10VDC and 7.5VAC.  The supply is suitable for microcontroller experimenting.   __ Designed by Wichit Sirichote

DC Power Wire also Carries Clock or Data -  03/13/98 EDN Design Ideas:  NOTE:  File contains many circuits, please scroll to find this one.  High-side current-sense amplifier, iC1, offers a simple method of combining low-speed clocks or other signals with dc power in cables between subsystems __ Circuit Design by Mike Hardwick, Decade Engineering, Turner, OR

DC Voltage Multiplier Plans -  Build a circuit to boost the voltage of a DC power source using a MAX756 IC Chip.   __ Designed by REUK-Renewable Energy UK website

DC/DC Conversion Without Inductors -  App Note #725__ Maxim Integrated

DC/DC Converter Drives LumiLEDs White LEDs from a Variety of Power Sources -  DN340 Design Notes__ Linear Technology/Analog Devices

DC/DC Converter Increases Available Power in Dual Voltage System -  01/08/04 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 curre __ Circuit Design by David Kim, Linear Technology App Note, Milpitas, CA

DC/DC Converter Provides Two 15A Outputs from a 3.3V Backplane -  DN278 Design Notes__ Linear Technology/Analog Devices

DC-DC converter starts up & operates from a single photocell -  03/20/13  EDN Design Ideas:  Reduce the parts count from the suggested data sheet circuit of this energy harvester.   __ Circuit Design by Larry Suppan

DC-DC converter to step up input voltage -  This is a simple circuit which outputs a voltage which is more than the input.  This could be used to power 12v or 9v devices from a 6v system, or even 6v devices from a 1.5v battery.   __ Designed by Rowan from Melbourne, Australia

DC-DC converters -  Two converters are shown here.  One powers a VCR or similar device from a car battery, while the other powers a model airplane glow plug from 12V. __ Designed by Manfred Mornhinweg

DC-DC Converters for Portable Computers -  DN52 Design Notes __ Linear Technology/Analog Devices

DC-Output, Constant Wattage 12 Volt Mercury Ballast! -  CAUIION, The following material gets quite technical at times, the device below makes high voltages that can kill you, and if things go wrong it is easy to make lots of smoke, custom and/or Homebrew ferrite core,  __ Designed by Don Klipstein

DC-to-DC Converter -  Here’s a low-cost circuit to convert 6V DC into 12V DC.  it uses no transformer and is easy to construct with few components.  The circuit is built around IC 555, which generates...__ Electronics Projects for You

DC-Voltage Doubler Reaches 96% Power Efficiency -  07/15/10 EDN Design Ideas:  Analog switches let you charge a capacitor from two directions __ Circuit Design by Marián Štofka, Slovak University of Technology, Bratislava, Slovakia

Depletion-Mode MOSFET Kick-Starts Power Supply -  10-Jan-08 EDN Design Ideas:  A depletion-mode MOSFET virtually eliminates power wasted in switcher's start-up circuitry __ Circuit Design by Gregory Mirsky, Milavia International, Buffalo Grove, IL

Design a Simple, Efficient & Reliable Forward Converter -  Due to the high cost and inflexibility of isolated DC/DC converter modules, many designers are choosing to implement a discrete design that is better matched to their application.  in particular, the forward converter with active clamp reset has been widely used in custom supplies because of its excellent efficiency and reduced__ Linear Technology/Analog Devices App Note, Kurk Mathews Senior Applications Engineer-Power Products Jun 14th 2012

Design Case Study: Designing a Power Supply for a Portable Wireless Contact Manager  -  App Note #1014__ Maxim Integrated

Design Notes 503: Dual DC/DC Controller for DDR Power with Differential VDDQ Sensing & ±50mA VTT Reference -  11/01/13  EDN-Design Notes   Solid-state circuit breaker for microcontrollers.  The LTC3876 is a complete DDR power solution, compatible with DDR1, DDR2, DDR3, and DDR4 lower voltage standards.  The IC includes VDDQ and VTT DC/ DC controllers and a precision linear VTT reference.  A differential output sense amplifier and precision internal reference combine to offer an accurate VDDQ supply.  The VTT controller tracks the precision VTTR linear reference with less than 20mV total error.  The precision VTTR reference maintains 1.2% regulation accuracy, tracking one-half VDDQ over temperature for a ±50mA reference load.   __ Circuit Design by Ding Li

Design Notes 504: 42V 2.5A Synchronous Step-Down Regulator with 2.5μA Quiescent Current -  11/26/13  EDN-Design Notes   Measure inductance & capacitance over a wide range.  The LT8610 and LT8611 are 42V, 2.5A synchronous step-down regulators that meet the stringent high input voltage and low output voltage requirements of automotive, industrial, and communications applications.  To minimize external components and solution size, the top and bottom power switches are integrated in a synchronous regulator topology, including internal compensation.  The regulator consumes only 2.5μA quiescent current from the input source even while regulating the output.   __ Circuit Design by Hua  Walker Bai

Design Notes: Dual controller provides 2μs step response & 92% efficiency for 1.5V rails -  12/29/13  EDN-Design Notes   Use a heated diode as a flow sensor.   The LTC3838 is a dual output, dual phase buck controller that employs a controlled constant on-time, valley current mode architecture to provide fast load step response, high switching frequency, and low duty cycle capability.  The switching frequency range is 200kHz to 2MHz—its phase-locked loop keeps the frequency constant during steady-state operation and can be synchronized to an external clock.  The LTC3838 accepts a wide input range, 4.5V to 38V, and can produce 0.6V to 5.5V outputs. __ Circuit Design by Linear Technology Design Note 505

Designing Linear Circuits for 5V Single Supply Operation -  Linear Technology AN11 __ Designed by Jim Williams - Sep 1st, 1985

Designing Linears for 5V Operation -  AN11 Linear Technology This note covers the considerations for designing precision linear circuits which must operate from a single 5V supply.  Applications include various transducer signal conditioners, instrumentation amplifiers, controllers and isolated data converters.  __ Linear Technology/Analog Devices

Desktop Power Supply -  Useful for electronics hobbyists, this linear workbench power supply converts a high input voltage (12V) from the SMPS of a PC into low output voltage (1.25 to 9 volts).  An adjustable...__ Electronics Projects for You

Desktop Power Supply from a PC -  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

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