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Power Supplies: AC to DC Converters / Linear      Page 1
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Power Supplies -- Main Page
Last Updated on: Friday, October 03, 2014 10:38 AM


Circuits Designed by Dave Johnson, P.E. :
  • 18v AC to DC Power Supply
    This is a classic linear power supply which produces a regulated 18v, rated at about 1 amp.  (added 7/06)

  • 9v Battery Eliminator
    If 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 around a very common LM317 adjustable voltage regulator. ...
  • 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.
  • 0.5v Negative Supply 4
    A while back someone needed a simple way to generate a negative 0.5v supply from a conventional transformer type AC to DC power supply.  The circuit below uses a couple schottky diodes and a filter capacitor to perform the feat.  The circuit is handy when using “rail to rail” op amp circuits which get close to zero volts at their output from a single DC supply but can’t quite deliver without a negative supply.  With the aid of the 0.5v supply circuit shown, those devices can produce a true zero output voltage.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:
0.5v Negative Supply 4
A while back someone needed a simple way to generate a negative 0.5v supply from a conventional transformer type AC to DC power supply.  The circuit below uses a couple schottky diodes and a filter capacitor to perform the feat.  The circuit is handy when using “rail to rail” op amp circuits which get close to zero volts at their output from a single DC supply but can’t quite deliver without a negative supply.  With the aid of the 0.5v supply circuit shown, those devices can produce a true zero output voltage. [Circuit of the week designed by David Johnson]

1.3 Volt Power Source -  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… [Aaron Cake's design]
1.5V to 5V Converter -  In many cases can be very handy to be able to convert 1.5V to 5V. Then you can power microcontroller or LED from a single AA or AAA battery. It is simple to do this as there are special IC�s as MAXIM MAX1674 or MAX7176.  This is step-up DC-DC converter that can convert voltages from 0.7V to any in range from 2V to 5.5V. MAX1676 have already preset pins for 3.3V and 5V, that makes easer integration in 3.3 and 5V circuits. IC can dissipate up to 444mW. ….(electronic schematic added 11/08)
10W HF Linear Amplifier -  Electroinic circuit…. [from Harry Lythall's website]
12 Volt to 9 Volt DC Converter -  Car Converter for12 Volt to 9V …. [Tony van Roon's circuit]
122 Volt AC Lamp Dimmer Full Wave SCR -  (circuit / schematic design added 6/06)
123 VAC Lamp Dimmer (full wave SCR) -  The full wave phase control circuit below was found in a RCA power circuits book from 1969. The load is placed in series with the AC line and the four diodes provide a full wave rectified voltage to the anode of a SCR. Two small....(electronic diagram added 6/06) 
12V DC to 220V 100W Inverter with 4047 IC & IRF540 -  This is 100W inverter circuit. It uses 4047 IC and IRF540 Mosfet instead of 2N3055 transistor. Power output is 100W from 2-3A transformer. ….(electronic schematic added 11/08)
12V Fluorescent Inverter -  Build this 20 watt Fluoro Inverter,  it drives two 20-watt tubes or a 40-watt tube!….(electronic circuit added 04/09)
12V to 110V/ 220V 500W Inverter  -  Using this circuit you can convert the 12V dc in to the 220V Ac. In this circuit 4047 is use to generate the square wave of 50hz and amplify the current and then amplify the voltage by using the step transformer. How to calculate transformer rating The basic formula is P=VI and between input output of the transformer we have Power input = Power output For example if we want a 220W output at 220V then we need 1A at the output. Then at the input we must have at least 18.3V at 12V because: 12V*18.3 = 220v*1 So you have to wind the step up transformer 12v to 220v but input winding must be capable to bear 20A. ….(electronic schematic added 11/08)
12V to 120V Inverter -  Have you ever wanted to run a TV, stereo or other appliance while on the road or camping? Well, this inverter should solve that problem. It takes 12 VDC and steps it up to 120 VAC. The wattage depends on which transistors you use for Q1 and Q2, as well as how "big" a transformer you use for T1. The inverter can be constructed to supply anywhere from 1 to 1000 (1 KW) watts. …....
12V to 220V 100W Inverter  -  This is a simple 100W inverter that can be used to achieve 110V or 220V from 12V. Circuit uses 2N3055 output transistors that are easily available. Output voltage depends on the type of transformer being used. …....
12v to 240v Inverter -  This circuit will produce 240v at 50Hz. The wattage will depend on the driver transistors and transformer. 
12W AC-DC Flyback converter -  Fully assembled and tested power supply with DC containing all design documentation Features: Universal AC line input, 0-1A Iout @ 12V, 84% efficiency at high line, Short Circuit protection, Over Voltage protection  (added 3/05)
13.8 Volt, 40 Ampere switching power supply -  A heavy duty, highly efficient, small and lightweight power supply specially designed for use with communication equipment.  This article was originally published in the QST magazine. Includes text, schematic diagram, printed circuit board layout, and some photos. [Manfred Mornhinweg]
18v AC to DC Power Supply -  This is a classic linear power supply which produces a regulated 18v, rated at about 1 amp.  (added 7/06) …. [Designed by David A. Johnson]
2 op amps provide averaged absolute value -  30-Oct-03 Issue of EDN  The circuit in Figure 1 is useful when you need amplitude demodulation or an averaged absolute-value conversion. The circuit comprises two stages, the first of which, IC1A, is a differential-output absolute-value converter. The second stage, IC1B, is a traditional differential amplifier. The combination of the two stages performs single-ended absolute-value conversion but only if R3>>R2.... [Design Idea by Dobromir Dobrev, Jet Electronics, Sofia, Bulgaria]
200W ATX PC Power Supply -  This power supply has ATX design and 200W performance. I was drawed diagram, when I repaired this power supply.  This power supply circuit uses chip TL494. Similar circuit is used in the most power supplies with output power about 200W....(electronic design added 6/07)
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.... [Designed by David A. Johnson]
24vac Powered Isolated +5v Supply -  24vac is a very popular power supply in many industrial systems.  It is often used in systems that involve water.  It is also popular with many inside and outside lighting systems.  The lower voltage means the danger of human electrocution is much less.  But, many DC powered sensors and control circuits associated with 24vac systems need to be fully isolated from the 24vac supply.  The circuit below accomplishes this feat.... [Designed by David A. Johnson]
3W HF QRP Linear Amplifier -  Electroinic design circuit…. [from Harry Lythall's website]
500mW HF Linear Amplifier -  Electroinic circuit schematic…. [from Harry Lythall's website]
500w HF Linear Amplifier -  Electroinic circuit schematic…. [from Harry Lythall's website]
500W Mos-Fet Power Inverter from 12V to 110V/220V  -  This circuit will provide a very stable "Square Wave" Output Voltage. Frequency of operation is determined by a pot and is normally set to 60 Hz. Various "off the shelf" transformers can be used. Or Custom wind your own FOR BEST RESULTS. Additional MosFets can be paralleled for higher power. It is recommended to Have a "Fuse" in the Power Line and to always have a "Load connected", while power is being applied. The Fuse should be rated at 32 volts and should be aproximately 10 Amps per 100 watts of output. The Power leads must be heavy enough wire to handle this High Current Draw! ….(design added 11/08)
50V 3A Stabilized Power Supply with 2N3055 -  Many times we needed a stabilized, together regulated power supply and high relatively output voltage. These specifications him it cover our circuit. It 's a circuit that can give in his exit + 40V until + 60V 3A, with simultaneous stabilization. The materials that use is very simple and will not exist difficulties in the manufacture, is enough you are careful certain points. 1 ] For output voltages smaller of + 50V until + 40V, the Q1 is hot enough, so that it needs one big heatsink. ….(design added 11/08)
6 to 12 Volt Converter (Aaron Cake) -  This circuit can provide up to 100%mA of12V power from a 6V supply. The circuit is simple, about 75% efficient and quite useful.....
600 Volt Power Supply -  simple 600 Volt DC power supply. Convert 230V AC to 300V and 600V DC......
60w Ac-DC Flyback Converter -  Universal AC line input Fully assembled and tested power supply with DC containing all design documentation Features: 0-4A Iout @ 15V, 87% efficiency at high line, Short Circuit protection, Over Voltage protection  (added 3/05)
80V Linear Regulator is Micropower -  DN314  Design Notes (Linear Technology) (app note added 2/06)
90W AC-DC Flyback converter -  Fully assembled and tested power supply with DC containing all design documentation Features: Universal AC line input, 0-6A Iout @ 15V, 83% efficiency at high line, Short Circuit protection, Over Voltage protection  (added 3/05)

Power Supplies: AC to DC Converters / Linear:  #'s         A - C        D - K       L - O        P - S      T - Z

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