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POWER SUPPLIES
 



 
 

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There is often the need to generate low voltage dc, typically ±5V, ±9V, and ±12V 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.
 

 

 

 
 
 
 
My main bench linear power supply is a Thurlby PL320 Dual 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.  As it uses toroidal transformers with conventional series regulators, I will convert it for some other use (see below).
 
 
 
 
 
 
 
 
January 2012
 
 
  
 
 
 
 
 
A more powerful linear power supply is a Farnell B30/10 Stabilised Power Supply.  This will provide from 0 to 30V dc in 5 ranges at 10A maximum.
 
This is useful for powering equipment in 'field' tests as an alternative to batteries.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
August 2012
 
 
 
This linear power supply is a Kingshill type S55/5 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.
 
 
 
 
 
 
 
 
 
 
 
 
October 2012
 
The Farnell TOPS/2 Stabilised Power Supply provides +5v, -15V and +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 a linear power supply and will be used as a second bench supply.
 
 
 
November 2012
 
The Magnex Scientific PSU (see above) was completely stripped down then rewired as a ±15V & +5V power supply.
 
 
 
Front panel with 3 LEDs
 
 
Rear Panel with mains input and 5 terminal posts
 
 
Top view
 
 
One toroid transformer has 2 18V secondaries to drive the +15V and -15V regulator circuits.  The other toroid transformer has its 2 9V secondaries paralleled to drive the +5V regulator circuit.  All 3 voltage regulators use the LM317T with a heatsink.
 
This power supply is being used in a rack cabinet in my new house to power dc LED lighting circuits.
 
 
 
December 2012
 
 
 
 
This linear power supply is an Advance PMG 12-5.5 Power Module 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.
 
 
 
 
 
 
 
January 2013
 
Tested the Kingshill S55/5 Power Supply under full load conditions.
  
 
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.
 
 
 
 
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