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13.8V 20A Power Supply - Regulated DC power supply, short circuit safe, and with current limiter. This PSU has been especially designed for current-hungry ham radio transceivers. it delivers safely around 20Amps at 13.8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have got here. The power transformer should be capable to deliver at least 25A at 17.5 to 20V. The lower the voltage, the lower power dissipation. __ Designed by Bob 13.8V 20A PSU - This is a Regulated DC power supply with short circuit protection and with current limiter. __ Designed by Andy Collison
15-48V 15A SMPS - A cheap, powerful, regulated bench supply made entirely from recycled junk.__
1A Variable Regulated Power Supply - A 'must-have' for the experimenter. __ Designed by Peter Parker VK3YE
2 AA cells power step-down regulator - 01/07/99 EDN Design Ideas: (Scroll to find this one) DC/DC conversion is particularly challenging when both the input and output voltages are low. Step-up ICs that operate with inputs lower than 1V are available, but step-down ICs that accept input voltages Page includes several designs. Design by Len Sherman, Maxim Integrated Products, Sunnyvale, CA
2.4MHz White LED Step-Up Converters with Built-In Schottky in ThinSOT - Switching Regulator__ Linear Technology/Analog Devices
24V/48V Hot Swap™ Controller - DN226 Design Notes__ Linear Technology/Analog Devices
2500W Phase Control - This circuit controls resistive and inductive loads up to 2, 500W. its main functional device is an integrated phase control circuit - Siemens TLE3103. it contains its own power supply, a zero voltage crossing detector circuit and __ Designed by Hans-Juergen Zons
3.3V Regulated Power Supply - Among the power supplies presented here, this is a well regulated type that can deliver up to 1.5A current from a wide range of input voltage of 5V to 25V dc. See LM317 calculator if you want to know how to get the 3.3 V output. __ Designed by KB Kaminski
5 Volt Regulator - Scroll for this one - You need to add a 5 volt regulator to power a USB device and this regulator needs to be a low-dropout type that consumes "micro" power so that it doesn't discharge the battery on its own. There are commercial regulators like the TPS76750Q in the PWP package that will do the job with just a couple of good ceramic bypass capacitors. (There are a bewildering number of suitable regulator choices.) But if you like to build your gadget from parts on hand, below are a couple of circuits that will work. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
9 Volt 2 Amp PSU - A simple 9 Volt 2 amp supply using a single IC regulator. __ Designed by Andy Collison
A 13.8V 20A PSU - This is a Regulated DC power supply with short circuit protection and with current limiter. __ Designed by Andy Collison
A 24V/48V Hot Swap™ Controller - DN226 Design Notes__ Linear Technology/Analog Devices
Adjustable 1.3-22V Regulated Power Supply - Want a regulated voltage that can be adjusted to suit your application? This Adjustable Power Supply is small, easy to build and can be adapted to produce a fully regulated voltage ranging from 1.3V to 22V at currents up to 1A.__ SiliconChip
Advanced TCA Hot Swap Controller Eases Power Distribution - DN353 Design Notes __ Linear Technology/Analog Devices
Automatic Trickle Charger - Scroll down to find this circuit. Here is the schematic for the automatic charger I have been using for my kids' battery cars. The charger is a small molded unit that probably doesn't supply more than an amp and this circuit would have trouble with much more. No current limit is provided by this circuit __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Basic regulated power supply - This is an easy regulator that only use zener diode , transistor , resisitors and capacitors. __
Basic UPS Power Supply - Regulated DC power supply, short circuit safe, and with current limiter. This PSU has been especially designed for current-hungry ham radio transceivers. it delivers safely around 20Amps at 13.8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have got here. The power transformer should be capable to deliver at least 25A at 17.5 to 20V. The lower the voltage, the lower power dissipation. __ Designed by Bob
Battery Discharge 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.
Bench Top Power Supply Auto-Fan - The op-amp used is a readily available LM339. This IC contains four op-amps but we use only two of them. Use the others for spare or do something else with it. For the thermistor I used a small, very expensive ($52) , glass-encapsulated type because I had it laying around but almost any type will do. I experimented with a couple different types and they all worked __ Designed by Tony van Roon VA3AVR
Bench Top Power Supply, Auto-Fan - The op-amp used is a readily available LM339. This IC contains four op-amps but we use only two of them. Use the others for spare or do something else with it. For the thermistor I used a small, very expensive ($52) , glass-encapsulated type because I had it laying around but almost any type will do. I experimented with a couple different types and they all worked __ Designed by Tony van Roon VA3AVR
Bench Top Power Supply, Part 2 - in this second part of the Bench Top Power Supply project we will cover the construction, assembly, and wiring of the large coolrib and the optional Automatic Fan Control circuit. When that is done the transformer T1, 115VAC components, large capacitor C3, and the bridge rectifier will be installed and wired up. There are lots of pictures and photos to help you out. Main thing to remember is to TAKE-iT-EASY, read the explanations and take your time. This is definitely a NO rush job __ Designed by Tony van Roon VA3AVR
Bench Top Power Supply, Part 3 - Almost done! in this part three we install the final parts, make the last connections, and do the final adjustments with the trimmer pots. Take your time (go-slow) with the trimmer pots for adjusting current! . __ Designed by Tony van Roon VA3AVR
Bench Top Power Supply, Part 4 PICs - i have been asked several times to include more construction pictures and photos. Well here they are. A couple of them can be magnified to full size; just click on them. I will add photos of the shunts for the panel meters and associated calculations on a later date. in the mean time this will get you going for a while __ Designed by Tony van Roon VA3AVR
Boosted LM317/LM337 Regulators - Transistors types have been altered to ones that are more readily available. __
Boosting Regulator Current - An outboard pass transistor used to increase the current output of a voltage regulator IC . __ Designed by Andy Collison
Calibrated trim tool tweaks multiturn pots - 01/07/99 EDN Design Ideas: Many analog circuits contain multiturn trimming potentiometers whose settings you may need to change during maintenance or calibration. Also, some instruments have panel-mounted potentiometers that may need periodic adjustments. After disturbing a setting by more than one or two turns, it becomes difficult or impossible to restore the original setting. The usual method Page includes several designs. Scroll to find this one Design by Sanjay Chendvankar, Tata Institute, Mumbai, India
Cockcroft Walton Diode Voltage Multipliers - These circuits generate high voltages and can cause dangerous shocks! Do not build these devices unless you are experienced and qualified to work on high voltage devices. __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Collection of Battery Chargers - Collection of battery charger circuits __ Contact: Charles Wenzel of Wenzel Associates, Inc. |
