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Last Updated:  Monday July 11, 2016 02:00:44 PM


Circuits Designed by Dave Johnson, P.E. :
  • +5v Powered Charge Pump Battery Charger -  The circuit below will trickle charge a four cell pack of AA or AAA NiMH batteries. The circuit draws current from the +5v available a USB connection and pumps about 70ma of current into the battery. This should be enough current to fully charge a pack of . . . [Circuit by David Johnson P.E.,  02/07/10]

  • 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.,  05/21/07]

  • 1 Watt Fluorescent Lamp Night Light  -  If you are tired of replacing small night light lamps, try this circuit. The line powered circuit uses a long life cold cathode fluorescent lamp. A simple charge pump technique runs the lamp without any transformer . . . [Circuit by David A. Johnson P.E.,  03/26/99]

  • 125Khz LC Oscillator  -  This circuit adds more invertors in parallel to deliver more power. It is similar to CMOS INVERTERS FORM 125KHZ OSCILLATOR. Please note that the values shown are for 125KHz.  . . . [Circuit by Dave Johnson P.E.,  03/12/02]

  •  125KHZ Medium Power Ocsillator  -  This circuit is similar to MEDIUM POWER 125KHZ OSCILLATOR but adds even more inverters in parallel to deliver yet more power. The values shown are for 125KHz . . . [Hobby Circuit designed by David Johnson P.E.,  03/12/02]

  •  125Khz Oscillator from CMOS Inverters  -  This circuit inverts the LC components so the inductor is grounded. Two inverters are needed to produce the needed oscillation. Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies . . . [Circuit by David Johnson P.E.,  03/12/02]

  •  125khz Oscillator with Medium Power  -  This circuit adds even more inverters in parallel to deliver yet more power. The values shown are for 125KHz . . . [Hobby Circuit designed by David A. Johnson P.E.,  03/12/02]

  •  125Khz Ultra Pure Sine Wave Signal Source  -  For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed. The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0. 01% . . . [Hobby Circuit designed by Dave Johnson P.E.,  02/11/02]

  •  12v 24v AC and 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.,  03/25/12]

  • 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.,  07/26/09]


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. . .  [electronic design 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. . .  [Seiichi Inoue's Web Site]

 

+30V Power Supply with +5V  -  I made power supply which makes about +30V with +5V power supply. Direct current is changed into alternating current by oscillator which used schmitt trigger inverter which hashysteresis characteristic and resonance circuit. high DC voltage (+50V) is made with alternating voltage using voltage Amplification rectification circuit. . .  [Designed by Seiichi Inoue]

 

+5V Power Supply Circuit  -  This circuit is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall transformers with variable output voltage are available from any electronics shop and supermarket. Those transformers are easily available, but. . .  [Tomi Engdahl's web]

 

+5v Powered Charge Pump Battery Charger  -  The circuit below will trickle charge a four cell pack of AA or AAA NiMH batteries. The circuit draws current from the +5v available a USB connection and pumps about 70ma of current into the battery. This should be enough current to fully charge a pack of . . . [Circuit by David Johnson P.E.,  02/07/10]

 

+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. . .  [by R.G. Keen]

 

C controls charge pump as background task  -  08/01/97  EDN Design Idea   Because of power consumption and cost, designers of battery-powered devices mainly choose components that run at 3V or lower. Unfortunately, many devices operate only at 5V, including LCDs with built-in drivers, programming lines of. . .  [by Carlos Cossio, Santander, Spain]

 

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.,  05/21/07]

 

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. . .  [Joseph Diverdi-Circuit Designer]

 

1 Watt Fluorescent Lamp Night Light  -  If you are tired of replacing small night light lamps, try this circuit. The line powered circuit uses a long life cold cathode fluorescent lamp. A simple charge pump technique runs the lamp without any transformer . . . [Circuit by David A. Johnson P.E.,  03/26/99]

 

10 Khz VFC uses Charge Pump Variation  -  04/09/98 EDN Design Idea   (Several circuits included, scroll to find this one)A diode-capacitor charge pump is the starting point for many voltage-to-frequency-converter (VFC] designs. The circuit in Figure 1 uses a variation on that classic theme to ach. . .  [by Stephen Woodward, University of North Carolina, Chapel Hill, NC]

 

100ma UltraLow Noise Charge Pump LED Supply with Output Current Adjust  -   LTC3201. . .  [Linear Technology]

 

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!. . .  [Don K Lipstein]

 

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. . . .  [Written by Don Klipstein]

 

12 VDC: 120 VAC Inverter Schematic  -  This Inverter takes 12 volt d. cand 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 to 9 Volt DC Converter  -  Car Converter for12 Volt to 9V. . . .  [Tony van Roon's circuit]

 

12+ Volt Voltage Doubler  -  This circuit was originally designed to operate a 15 volt regulator from an unregulated 12 volt AC adapter, but can be used for whenever you need more than 12 volts from a 12 volt supply. Im posting it because one reader built a 12 volt DC to AC converte. . .  [Designed by Andrew R. Morris]

 

125Khz LC Oscillator  -  This circuit adds more invertors in parallel to deliver more power. It is similar to CMOS INVERTERS FORM 125KHZ OSCILLATOR. Please note that the values shown are for 125KHz.  . . . [Circuit by Dave Johnson P.E.,  03/12/02]

 

125KHZ Medium Power Ocsillator  -  This circuit is similar to MEDIUM POWER 125KHZ OSCILLATOR but adds even more inverters in parallel to deliver yet more power. The values shown are for 125KHz . . . [Hobby Circuit designed by David Johnson P.E.,  03/12/02]

 

125Khz Oscillator from CMOS Inverters  -  This circuit inverts the LC components so the inductor is grounded. Two inverters are needed to produce the needed oscillation. Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies . . . [Circuit by David Johnson P.E.,  03/12/02]

 

125khz Oscillator with Medium Power  -  This circuit adds even more inverters in parallel to deliver yet more power. The values shown are for 125KHz . . . [Hobby Circuit designed by David A. Johnson P.E.,  03/12/02]

 

125Khz Ultra Pure Sine Wave Signal Source  -  For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed. The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0. 01% . . . [Hobby Circuit designed by Dave Johnson P.E.,  02/11/02]

 

12v 24v AC and 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.,  03/25/12]

 

12V Distribution in μTCA Redundant Power Subsystem  -  The LTC4225 offers ideal diode and Hot Swap functions for two power rails by controlling external series connected N-channel MOSFETs. MOSFETs acting as ideal diodes replace two high power Schottky diodes and the associated heat sinks, saving power and board area. Hot Swap control MOSFETs allow boards to be safely inserted . . .  [Linear Technology App Note - , Apr 22, 2011]

 

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.,  07/26/09]

 

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 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 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 App Note - , Jan 27th 2011]

 

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