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

Last Updated:  Friday December 22, 2017 02:25:08 PM

Circuits Designed by Dave Johnson, P.E.

0.5v to 6v Voltage ConverterConventional 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 . . . Hobby Circuit designed by David Johnson P.E.-May, 2007

12v to 19v Laptop Power Supply (Concept)Concept Only.  I have a big screen HP laptop computer.  The large brick size AC to DC power supply is rated at 19.2v and 9.5 amps, which is about 180 watts.  Id like to be able to use the thing in my car.  I looked into a 12v car adapter for it but never really found one that I liked.  Most were underpowered.  The other option was to use the existing AC to DC adapter and run it off power from a 12v to 120vac inverter. . . Circuit by David Johnson P.E.-July, 2009

12v-24v AC & DC Day/Night SwitchThe circuit uses a bridge rectifier circuit to convert AC into DC.  A 12v zener diode limits the operating voltage of the circuit to 12v.  A tiny Schmitt trigger inverter and a phototransistor detects the ambient light intensity.  If there is sufficient light, the inverter disables a push-pull oscillator circuit . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2012

240VAC to 5VDC Power SupplyThis is simple way to power some 5v logic from a 240vac source.  If a 120vac power adapter is used, the circuit will also work for 120vac power lines. . . Circuit by David Johnson P.E.-February, 2002

5+V Classic Linear Supply using 6.3VAC TransformerA classic method for producing a regulated +5v DC supply is shown below.  This circuit consists of an iron core transformer, a bridge rectifier, a filter capacitor and a voltage regulator.  Many people are tempted to use a very popular 6.3v transformer . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2009

9v 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 Johnson P.E.-December, 2009




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

.4 watt 100% Radio Shack DC-DC Converter -  This DC-DC converter   ("inverter") needs nothing but unmodified Radio Shack parts.  You don't need to build or wind any coils or transformers __ Designed by Don Klipstein

+/-12V-> +/-5V Power unit This is the voltage converter to get the voltage of 5V from the input voltage of 12V.  I am using the 3 terminal voltage regulator for the voltage to be changed in this unit.  As the regulator, LM317 is used for the positive voltage and LM337 is used for the negative voltage.  The output current can make output in 1 A __ Designed by Seiichi Inoue

+30V Power Supply with +5V -  I made power supply which makes about +30V with +5V power supply.  Direct current is changed intoalternating current byoscillator which usedschmitt trigger inverter which hashysteresis characteristic andresonance circuit.  high DC voltage   (+50V) is made withalternating voltage usingvoltage amplification rectification circuit __ Designed by Seiichi Inoue

 

+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

+9 Volt*and*  9 Volt from One Battery! -  MAX1044 is a charge pump converter it uses a capacitor as a "bucket" to pump charge from one place to anor.  It can be used to generate negative voltage easily __ Designed by R.G. Keen

0 to 30 Volt LAB Supply -  The linear power supply, shown in the schematic, provides 0-30 volts, at 1 amp, maximum, using a discrete transistor regulator with op-amp feedback to control the output voltage.  The supply was constructed in 1975 and has a constant current mode that is used to recharge batteries.   __ Designed by Michael Ellis

0.5v to 6v Voltage Converter -  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 . . . Hobby Circuit designed by David Johnson P.E.-May, 2007

0-1000 Volt Regulated High Voltage Power Supply -  Input voltage from high voltage DC DC converter is 12V AC at 800mA current and then converted to DC through a bridge rectifier Diode 1A.  The voltage output of converter circuit can be adjusted in the range of 0-1000V DC.  This high __ Designed by Joseph Diverdi

1.2MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT -  LT3465 Switching Regulator___ Linear Technology/Analog Devices

1.3V Power Supply -  This is a replacement power source for 1.3V mercury cells or other small batteries.  It has many uses and I use this circuit in my computer to power a front panel multi adapter which has a digital thermometer __ Designed by Andy Collinson

10-15W watt 100% Radio Shack DC-DC Converter -  This DC-DC converter   ("inverter") needs nothing but unmodified Radio Shack parts.  You don't need to build or wind any coils or transformers.  This is a cheap-and-dirty experimenter's circuit.  I tested this and it worked for me, but I disclaim all warranties! __ Designed by Don Klipstein

12 VDC: 120 VAC Inverter Schematic -  This Inverter takes 12 volt DC and steps it up to 120 volt a.  c.  The wattage depends on which transistors you use for Q1 and Q2, as well as the "Amp Rating" of the transformer you use for T1.  This inverter can be constructed to supply anywhere from 1 to 1000   (1 KW) watts___ Global Village Institute for Appropriate Technology

12 Volt 30 Amp Power Supply -  uses a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to30 amps __ Designed by Andy Collison

12 Volt Alarm Power Supply -  A 12 Volt power suppiled designed for Ron's Modular Burglar Alarm.  However, being a popular supply voltage this circuit will have many other uses as well.   __ Designed by Andy Collison

12 Volt Battery Charge Monitor -  Here is a battery monitor circuit which disconnects the load when the battery is discharged, preventing a deep discharge which could cause permanent battery damage.  The battery is automatically reconnected when a battery charger or other DC source is connected across the load.  Select a relay which requires less than 100ma coil current and with contacts capable of handling the load and charging __ Contact: Charles Wenzel of Wenzel Associates, Inc.

12 Volt to 9 Volt DC Converter -  To get a more precise output voltage, replace zener diode Z1 with 10V and R1 with a 1Kilo ohm potentiometer.  A Coolrib for Q1 is optional but highly recommended.  You can replace Q1 for a more robust type to get more output amps depending on your requirements.  Simple circuit to power your 9 volt cassette recorder and other stuff __ Designed by Tony van Roon  VA3AVR

12v to 19v Laptop Power Supply (Concept) -  Concept Only.  I have a big screen HP laptop computer.  The large brick size AC to DC power supply is rated at 19.2v and 9.5 amps, which is about 180 watts.  Id like to be able to use the thing in my car.  I looked into a 12v car adapter for it but never really found one that I liked.  Most were underpowered.  The other option was to use the existing AC to DC adapter and run it off power from a 12v to 120vac inverter. . . Circuit by David Johnson P.E.-July, 2009

12v-24v AC & DC Day/Night Switch -  The circuit uses a bridge rectifier circuit to convert AC into DC.  A 12v zener diode limits the operating voltage of the circuit to 12v.  A tiny Schmitt trigger inverter and a phototransistor detects the ambient light intensity.  If there is sufficient light, the inverter disables a push-pull oscillator circuit . . . Hobby Circuit designed by David A. Johnson P.E.-March, 2012

12V-24Vin to 5VoutAT1.4A Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3575 is a monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation.  The part senses the isolated output voltage directly from the primary side flyback waveform.  A 2.5A, 60V NPN power switch is integrated along with all control___ Linear Technology/Analog Devices App Note, Jan 27th 2011

12V-24Vin to 5VoutAT350mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3574 is a monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation.  The part senses the isolated output voltage directly from the primary side flyback waveform.  A 0.65A, 60V NPN power switch is integrated along with all control___ Linear Technology/Analog Devices App Note, Jan 27th 2011

12V-24Vin to Four Output 12VAT120mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3575 is a monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation.  The part senses the isolated output voltage directly from the primary side flyback waveform.  A 2.5A, 60V NPN power switch is integrated along with all control___ Linear Technology/Analog Devices App Note, Jan 27th 2011

13 VDC to 120 VAC Inverter -  This Inverter takes 12 volt DC and steps it up to 120 volt a.  c.  The wattage depends on which transistors you use for Q1 and Q2, as well as the "Amp Rating" of the transformer you use for T1.  This inverter can be constructed to supply anywhere from 1 to 1000   (1 KW) watts __ Designed by Aaron Cake

13.8 Volt 20A PS - U -  This is a Regulated DC power supply with short circuit protection and with current limiter.   __ Designed by Andy Collison

13.8V 20A PS - U -  This is a Regulated DC power supply with short circuit protection and with current limiter.   __ Designed by Andy Collison

13V-30Vin to +/-5VAT500mA Monolithic Isolated Flyback Converter (No Opto or Third Winding) -  The LT3575 is a monolithic switching regulator specifically designed for the isolated flyback topology.  No third winding or opto-isolator is required for regulation.  The part senses the isolated output voltage directly from the primary side flyback waveform.  A 2.5A, 60V NPN power switch is integrated along with all control___ Linear Technology/Analog Devices App Note, Jan 27th 2011

14 VDC to 120 VAC Inverter -  This Inverter takes 12 volt DC and steps it up to 120 volt a.  c.  The wattage depends on which transistors you use for Q1 and Q2, as well as the "Amp Rating" of the transformer you use for T1.  This inverter can be constructed to supply anywhere from 1 to 1000   (1 KW) watts __ Designed by Aaron Cake

16-bit adjustable reference uses 8-bit digital potentiometers -  12/25/03 EDN-Design Ideas It may be easy to find a precision voltage reference for your application; however, a programmable precision reference is another matter.  The circuit in Figure 1 yields a precision reference with an LSB of 62.5 V.  The circuit is a 16-bit DAC using three 8-bit digital potentiometers and three CMOS op amps__ Circuit Design by Bonnie Baker, Tucson, AZ

2 ICs Convert 4 20mA Signal to 0 5V Output -  App Note/ 823 / Jul-09___ Maxim Integrated

2 Watt Switching Power Supply -  In this small switching power supply, a Schmitt trigger oscillator is used to drive a switching transistor that supplies current to a small inductor.  Energy is stored in the inductor while the transistor is on, and released into the load circuit when the transistor switches off.  The output voltage is dependent on the load resistance and is limited by a zener diode that stops the oscillator when the voltage reaches about 14 volts.  Higher or lower voltages can be obtained by adjusting the voltage divider that feeds the zener diode.  The efficiency is about 80% using a high Q inductor.   __ Designed by Bill Bowden

2.4MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT -  Switching Regulator___ Linear Technology/Analog Devices

2.7V to 4.2V to-5V at 90mA & 4.6V at 100mA AM OLED Power Supply -  LT3582 are dual DC/DC converters with positive and negative outputs.  The positive output voltage can be set between 3.2V and 12.775V in 25mV steps.  The negative output voltage can be set between 1.2V and 13.95V in 50mV steps.  Optional I2C Programming___ Linear Technology/Analog Devices App Note, .Mar 24th 2010

240VAC to 5VDC Power Supply -  This is simple way to power some 5v logic from a 240vac source.  If a 120vac power adapter is used, the circuit will also work for 120vac power lines. . . Circuit by David Johnson P.E.-February, 2002

26V-to-5000V DC-DC Converter -  This circuit can provide 5, 000 VDC from 26 VDC.  This circuit has ripple of under 0.01% due to Voltage-doubling capacitors.  As sinusoidal oscillator, a 2N217 transistor is used.  The diode and the capacitors at the output stage should be of high voltage type.   __

2-Phase Dual Switching Regulator Fits in Tight Places -  DN210 Design Notes___ Linear Technology/Analog Devices

2-Step Voltage Regulation Improves: Design Notes Linear Technology -  DN209 Design Notes___ Linear Technology/Analog Devices

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


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