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16 Sep 2014


Fifteen types, three sizes and three strong features – these are the new DIN-rail power supplies Uno Power from company Phoenix Contact.

To be on the top in a segment of power supplies nowadays means above all high efficiency, low power consumption without a load (Standby) and compact dimensions. New series Uno Power from company Phoenix Contact meets all the most important requirements expected from a good power supply and gives a guarantee of a precise construction known from components from Phoenix Contact at the same time.

Main benefits:

  • high efficiency over 90% at full load
  • very low standby losses below 0.3W
  • compact dimensions and low construction height only 84 mm enables easy assembly into favorite 120mm installation boxes.
  • 15 types with output power of 25-100W, single output (5, 12, 15, 24 a 48VDC)
  • MTBF > 500 000 hrs

Uno Power are available in three sizes – in a width of 22.5/ 35/ 55mm x 90 x 84mm (wxhxd). High efficiency at maintaining compact dimensions results into a high energy density. In praxis it means that for example the 60W type is only 35mm wide.

Uno Power series is marked as „basic“, i.e. doesn´t provide various extra functionality, but on the other hand it provides everything necessary for majority of applications while maintaining an affordable price. Uno power is able to work with a global input voltage range 85-264VAC and is also suitable for applications outside (in a suitable box) – thanks to a guaranteed functionality already from -25°C.
Two 90W types are also certified according to UL1310/508 class 2, while the 2-phase type (24VDC/90W) is suitable for places, where only a higher input voltage is available (264-575 Vac).

Further information can be found in the Phoenix Uno Power flyer and in datasheets at particular types. Another power supplies and UPS can be found in the Phoenix Contact power supplies catalogue.

Power supplies Phoenix Uno Power – yes for three times - [Link]

13 Sep 2014

by mjlorton @ youtube:

I go through the design and operation of the college power supply project. There is one minor error that still needs to be corrected but I think we are very close to a final design.

DIY Bench Power Supply #5 – Circuit Design and Operation - [Link]

1 Aug 2014


Bertho posted a digitally controlled PSU design in the forum. He writes:

The design is for 0…30V and 0…3A (90W) controllable at ~1mV and ~0.1mA steps. The actual accuracy is still out for testing and I assume that noise and non-linearity will be a factor to look at when time comes. The basic design allows for 0…42V (max 45V) and (at least) 0…4A, but then all the components should be re-calculated to match such setup. Also, some components need to be voltage matched for a higher input voltage.
The design is a dual control-loop where the first stage is a switching PSU which is fed back to assure a 2.5V drop over the secondary analog control stage. The secondary stage is also responsible for the current limiter. The idea here is to reduce the power loss in the BJT (Q4) in the analog stage.


Digitally controlled bench PSU - [Link]

28 Jul 2014


This project is a solution to power up most of devices or projects requiring dual (+/-12V) power supply.

Symmetric +/-12 VDC power supply has been designed for audio applications, can power up microphone pre-amplifier, audio buffers, audio mixer, distributions amplifier, headphone amplifier, VU meter and few o other equipment or projects required dual supply.

+/-12V Dual Power Supply - [Link]

17 Jul 2014


Programmable DC, AC, current- and high-voltage power supplies, electronic loads, UPS, inverters and chargers of small and high power suitable for production and servicing – this is Elektro Automatik.

When we establish a production or testing workplace, we usually can´t omit a suitable power supply. Sometimes a „universal“ like 2x30V/3A is sufficient, but often not. It´s well known fact for those of you, who produce devices various devices requiring higher current or higher voltage. Typical representatives are equipment for automotive industry, various drives, backup sources, solar devices etc. In these case tens to hundreds Amps and/or hundreds to thousands of Volts are no rarity.

Right for these purposes, German company Elektro Automatik produces devices and systems for power supply and simulation of conditions in a real operation. Adjustable DC and AC power supplies, current sources, electronic loads and other devices can serve for a thorough examination of your devices even in “border conditions” and they can help to discover eventual hidden faults which might occur later in a real operation. Many Elektro Automatik products are programmable and they´re also connectable to some of common buses like CANopen, Profibus, ProfiNet, DeviceNet, Modbus, Ethernet and also RS232. Also interesting are for example electronic loads with energy recovery, where the lost energy doesn´t transform to heat but returns back to mains line with efficiency of about 93%.

Upon request, we´re able to provide you with any product from the Electro Automatik catalogue (14,5 MB).

Where common power supplies end, there the Elektro Automatik begins - [Link]

30 Jun 2014


An SMPS application using PIC16F785 from Microchip. [via]

In this application note, we will examine a typical buck topology intelligent SMPS design using the PIC16F785.

The design presented here shows an alternative single-chip approach to adding intelligence to SMPS designs. The basic design is really unchanged. There are current and voltage feedback loops, a counter-based PWM is used to generate the reference voltage to the voltage loop, and the microcontroller uses the reference voltage to modify the operation of the system in response to conditions sensed through the ADC.

App note: Switching power supply design with the PIC16F785 - [Link]

26 Jun 2014


This project is a solution to power up most of devices or projects requiring dual (+/-) adjustable power supply. The circuit is based on LM317 positive and LM337 negative voltage regulators. LM317 series of adjustable 3 terminal regulator is capable of supplying in excess of 1.5A over a 1.2V to 30V DC output range, due to TO3 package of IC and large heat sink the power supply can handle maximum load current.

Dual Adjustable Power Supply - [Link]

23 Jun 2014

An all-in-one breadboard with Oscilloscope, Spectral Display, Function Generator, and Power Supply.

We are excited to bring a low-cost audio range electronics development board to classrooms, labs, small businesses, and techno-geeks everywhere. This idea has been bouncing around in our family for many years and now the technology has caught up to make it a reality at a price that schools and individuals can afford. We have paired a traditional prototype board (or breadboard) with an electronics suite so that the experimenter does not have to purchase the expensive electronics test equipment needed during development. It is everything we wish we had when we were learning about circuits on a breadboard.

Bakerboard: The Educational Breadboard with More - [Link]

19 Jun 2014

w2aew @ youtube.com writes:

This video describes and demonstrates a fun little circuit that is designed to create a automatically switching, dual-range analog voltmeter which is intended to be built into a variable power supply. By using two ranges, it permits accurately setting a low voltage such as 3.3 or 5V, as well as accurately setting a higher voltage like 24V. Setting a low voltage using a high voltage meter is not very precise, hence the reason I put this together. The circuit is demonstrated, and the schematic is reviewed to describe the operation.

Of course, there are many ways this can be done – this is just one example. It uses one of my favorite little analog ICs, the LM10 op amp and reference. The LM10 (designed by the legendary Bob Widlar) is used as a voltage reference and comparator with hysteresis. A zener diode is used as a shunt regulator. There’s an indicator LED to show when the meter is in the high range, and a 2N7000 enhancement mode n-channel MOSFET is used to change the resistors associated with the analog meter.

Auto-ranging Analog Voltmeter for a variable power supply - [Link]

9 Jun 2014


by Electro-Labs:

Prototyping is a useful and powerful method in electronics which lets us analyze a circuit before using it in a system or turning it into a product. In this process we may need a single supply or multiple supplies to power the circuit depending on the type of the application. For example, an op-amp circuit may need a symmetrical supply such as +12V and -12V or a logic circuit may require both 5V and 3.3V at the same time. Some applications may need three or more. This means we should have a bench supply with multiple outputs or multiple bench supplies in the environment. This may not be always possible. This DIY Prototyping Board is designed to provide all the most used supply voltages that a designer will need during prototyping a circuit. The switching power supplies on the board output 3.3V, 5V, 12V and -12V rated at 1A independently. In addition those there are two precise voltage references at 5V and 2.5V provided especially for op-amp based applications.

DIY Prototyping Board with 3.3V, 5V, 12V and -12V Built in Power Supplies - [Link]






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