Radu Motisan writes:
Having a regulated power supply that can output precise voltages in the 0 .. 30Volts interval is a great add-on for any electronics lab. Especially when it’s a high power supply.
For this article, I’m going to show my supply, built from scratch, the design I’ve used (schematics) and a few safety tips.
First thing we need is a high power transformer. I’ve ordered a custom toroidal unit, with a primary for 220V mains, and two secondaries one of 24Volts, 10Amps max and another one of 12V, 0.5Amps max. It’s very heavy it it was quite expensive. I’ve also purchased a rectifier bridge, capable of handling 400V at 35A max.
Variable 0..30V 20A Regulated Power supply using LM317 – [Link]
PowerEsim- Free on-line switch mode power supply SMPS, circuit and transformer design, calculation, simulation software. More than 100 circuits and topologies are available with real constructed transformer.
It provides a virtual laboratory environment for users to wind and place every single turn of a transformer, and with the help of tens of thousands real modeled component on the market, user can simple pick and place the real component and stuff into the circuit, within a fraction of a second, our server will immediately return the result to the user. It is even faster than modifying prototype in real environment, and more than that is no worry of getting explosion of the prototype on real bench. It is Better than real.
PowerEsim – Free SMPS Switching Power Supply / Transformer Design Software – [Link]
- Three terminal adjustable regulator
- Output current of 7.5A
- Line regulation 0.015%
- Voltage control 0.1%
- Available in 3 package, TO-220, TO-3P and DD
LT1083 Low Dropout Adjustable Power Supply 7.5A @ 1.2 to 25Volts – [Link]
A new series of value-for-money laboratory units for laboratories, workshops, schools, research and development. Available in two versions with voltage ranges from 0 V to 42 or 84 V in the power range 100 and 320 W respectively. The 84 V versions is also available in an intermediate band, 160 W. The unit has a USB port, and software for, e.g., remote control, monitoring and logging, is available as an option.
Laboratory power supply 0…6 A 0…42 VDC – [Link]
Are you looking for a portable breadboard power supply with a selectable voltage? Also thinking about how long the batteries will last? This project utilizes one or two AA/AAA batteries to generate a preselected voltage of 5V or 3.3V, and squeezes the batteries untill they have almost no power at all. AASaver is based on the Microchip MCP1640 boost converter. [via]
When your electronic devices report that the batteries are ‘dead’ and need to be replaced, do you ever feel frustrated that there is often still a lot of juice in them? Don’t throw away the batteries yet! You can use the remaining energy to do a lot of things, such as powering LED flashlights. This is possible by using a boost converter, which can bump the low battery voltage to a higher voltage, enough to light up LEDs or even power breadboard circuits.
Squeeze the power out of batteries using AASaver – [Link]
AS with many tinkerers and junk electronics collectors, a variety of “acquired” power supplies wind up on the author’s shelves to await attention. But are they worth keeping? Testing them with a resistive load is messy and difficult, and with high current supplies it is nearly impossible, unless you have a carbon pile! The tester whose circuit diagram is shown in Fig controls supply currents to 20A, and voltages from 1·7V to over 50V. Current control is so stable that once the current is set, a supply voltage can be varied across this range and the current will remain constant. Maximum power will depend upon how well the pass transistors utilize heatsinks.
Power Supply Tester circuit – [Link]
This is a standard bench power supply for prototyping electronic circuits.
Its main feature is a selection of outputs at standard fixed voltages used in electronics. Because the outputs are fixed you do not have to worry if the voltage is correct, you just plug the wire in. It is quick and easy to use.
You will probably still need a conventional variable power supply to test circuits over a range of voltages – but this is the one that you will use for day-to-day development.
It features four fixed outputs with an overall 1 amp capacity:
+5V and +3.3V
+9V or +12V or +15V
-9V or -12V or -15V
Standard bench power supply – [Link]
The LTM®4600 is a complete 10A switchmode step-down power supply with a built-in inductor, supporting power components and compensation circuitry. With high integration and synchronous current mode operation, this DC/DC µModuleTM delivers high power at high efficiency in a tiny and low profile surface mount package. Supported by Linear Technology’s rigorous testing and high reliability processes, the LTM4600 simplifies the design and layout of your next power supply.
- 15mm x 15mm x 2.8mm LGA with 15°C/W θJA
- Pb-Free (e4), RoHS Compliant
- Only CBULK Required
- Standard and High Voltage:
* LTM4600EV: 4.5V<=VIN<=20V
* LTM4600HVEV: 4.5V<=VIN<=28V
- IOUT: 10A DC, 14A Peak
- Parallel Two µModules for 20A Output
LTM4600 – 10A switchmode step-down power supply with a built-in inductor – [Link]