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Azur Electronics

POWER SUPPLIES
There is often the need to generate low voltage dc, typically ±5V, ±9V, ±12V and ±15V at currents usually only up to a few Amps. This is required for testing components and powering up prototype circuits and systems. Transformer based linear power supplies are much better than switched mode power supplies. Bench PSU's for testing other equipment generally supply variable voltages up to 2A. Stand alone PSU's are also available for fixed voltages at higher currents, typically 5A to 10A. 
 
The Thurlby PL320 Dual Power Supply is my main bench linear power supply. Two independant outputs of 0V to 32Vdc at up to 2A are available together with current limiting. Digital displays of voltage and current are especially useful.

June 2011

This Magnex Scientific PSU came with a Rack Cabinet. It has unusual outputs of +18V, -18V & -7V. It uses toroidal transformers with conventional series regulators.
 
November 2012

I have converted the PSU to use in a Rack Cabinet in my new house to power dc LED lighting circuits.
It was completely stripped down then rewired as a ±15V & +5V power supply.

One toroid transformer has 2 x 18V secondaries to drive the +15V and -15V regulator circuits. The other toroid transformer has its 2 x 9V secondaries paralleled to drive the +5V regulator circuit. All 3 voltage regulators use the LM317T with a heatsink.

January 2012

The Farnell B30 / 10 Stabilised Power Supply is a more powerful linear power supply. This will provide from 0 to 30V dc in 5 ranges at 10A maximum. 

I use this as my third bench PSU.
It is also useful for powering equipment in 'field' tests as an alternative to batteries. 
 
October 2012

The Electrowind Mains Power Isolating Transformer provides galvanic isolation between primary and secondary. This ensures safety against electric shocks for the DUT (Device Under Test) when connected to the output. Useful when working on mains power supplies in equipment.

In the UK the mains voltage is nominally 230Vac. This house is at 254Vac and although reduced to 230Vac with a Variac, this is still a dangerous voltage.

On the output of the Isolating Transformer, by inadvertantly connecting Live to Earth no current will flow and the Neutral will float to 230Vac. Similarly connecting Neutral to Earth no current will flow and the Live will float to 230Vac.

Rated at 240Vac and 500VA, so typically 2A max at mains voltages.

August 2012

The Kingshill Type S55/5 is a linear power supply and provides an output of 5V at 5A max.

There is a front panel adjustment from almost 0.3V to 6V. Connections are all hard-wired to screw terminals behind the protective cover.

This is used in a Rack Cabinet in my new house to power dc USB charging circuits.

October 2012

The Farnell TOPS/2 Stabilised Power Supply is a linear power supply and provides +5v, -15V & +15V dc outputs. The +5v output is variable from +4.07V to +6.18V at 5A max with overload indication. The -15V output is variable from -11.69v to -17.15V at 1A max with overload indication. The +15V output is variable from +11.72V to +17.19V at 1A max with overload indication.

This is used as a second bench PSU.

December 2012

The Advance PMG 12-5.5 Power Module is a linear power supply and provides an output of 12V at 5.5A max. All the electrolytic capacitors needed replacing!

There is a front panel adjustment from 11.6V to 12.6V. Connections are all hard-wired to screw terminals behind the protective cover.

This is used in a Rack Cabinet in my new house to power +12V power circuits.
 
September 2013

Unusually I have bought a new power supply. This is a Manson SPS-9400-209MG (branded as Rapid Electronics PS1540S) and provides 3V to 15V at up to 40A with digital display of voltage and current. The high current output uses switched mode technology.

This power supply is being used in a Rack Cabinet in my new house to power dc LED lighting circuits.

Farnell Electronics made lots of power supplies. This one is a kit of parts (144-005) and can be configured as either a 6.9V or 13.8V PSU for charging lead acid batteries. I have 2 of these and they have been set up as conventional linear 12V PSU's.  

This power supply is being used in a box in my new house to power dc heating circuits. The 2nd unit is being kept as a spare.