DIYbio:Notebook/Open Gel Box 2.0/Power Supply

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m (weighing in on spec suggestions)
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When all interested parties have had their "vote" we'll revisit and discuss any that have too many n's.
When all interested parties have had their "vote" we'll revisit and discuss any that have too many n's.
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* Must be totally enclosed (y)
+
* Must be totally enclosed (y)(y)
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* Must work with 110/220 VAC input (y)
+
* Must work with 110/220 VAC input (y)(y)
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* Single channel 20-120 VDC output voltage, variable in 10 V steps (y)
+
* Must work with 50Hz/60Hz AC input (y)
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* Must use red and black banana plug connectors (y)
+
* Single channel 20-120 VDC output voltage, variable in 10 V steps (y)(y, at least)
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* Must have a voltmeter display (y)
+
* Must use red and black banana plug connectors (y)(y)
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* Must be capable of continuous 300 mA load (y)
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* Must have a voltmeter display (y)(y)
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* Must be capable of continuous 300 mA load (y)(y, at least)
* Must employ resettable CB protection (y)
* Must employ resettable CB protection (y)

Revision as of 21:30, 12 January 2009

Jan 08, 2009, 10:34 PM

Specification Discussion

After talking to a number of people and reading the various discussion threads I propose the following specification for the Power Supply.

Edit each line to place a y (agree) or an n (disagree) for each of the line items. You do not need to justify any n's.

Feel free to add a line item you feel is important.

When all interested parties have had their "vote" we'll revisit and discuss any that have too many n's.

  • Must be totally enclosed (y)(y)
  • Must work with 110/220 VAC input (y)(y)
  • Must work with 50Hz/60Hz AC input (y)
  • Single channel 20-120 VDC output voltage, variable in 10 V steps (y)(y, at least)
  • Must use red and black banana plug connectors (y)(y)
  • Must have a voltmeter display (y)(y)
  • Must be capable of continuous 300 mA load (y)(y, at least)
  • Must employ resettable CB protection (y)


Jan 06, 2009

What we need: clean, stable, variable DC at 20V-100V, adjustable (possibly up to 600V).

Consider: using a cheap computer ATX supply feeding a voltage regulator such as an LM317 feeding a DC/DC step-up built on the model introduced in http://www.edn.com/contents/images/70804di.pdf (from http://www.edn.com/article/CA431146.html ).

For $10-$20 , you get plenty of overhead (i.e. 400W max neighborhood), 50/60Hz and 110/220V independence, amp draw regulation (probably? not sure what typical protection is in the low price range), and handy plug-in molex connectors. The last point is particularly salient, if you can power more than one device with a versatile power supply.

Low cost "brick" supply is available from manufacturers such as GlobTek (Taiwan); *jcline@ieee.org 18:22, 8 January 2009 (EST):
For example, GT(M)21097CC SERIES 50W
"AC/DC LOW-VOLTAGE SINGLE-OUTPUT, CONSTANT-CURRENT, VOLTAGE-LIMITED SWITCHING POWER SUPPLIES(DESKTOP), UNIVERSALINPUT/IEC 320 INPUT RECEPTACLE FOR CONNECTION OF POWER SUPLYCORD SET, INTENDED FOR USE WITHIN INFORMATION TECHNOLOGYEQUIPMENTAND MEDICALELECTRICAL EQUIPMENT."
Has Input Voltage 90v-260v @ 47Hz-63Hz (suitable for worldwide use)
Has Output Voltage +48.0 VDC @ 0 - 1.1 A
Cost is probably around $20-$30 per unit in low quantities.

I do not know how adding a voltage regulator (LM317 etc) and DC/DC step-ups after these affect their voltage regulating properties.

Converting a computer ATX power supply to a really useful lab power supply http://www.instructables.com/id/Converting-a-computer-ATX-power-supply-to-a-really/

How to Add Variable Voltage to Your ATX Based Bench Power Supply http://www.wikihow.com/Add-Variable-Voltage-to-Your-ATX-Based-Bench-Power-Supply

Building a Power Supply http://www.eleinmec.com/article.asp?16

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