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Old 29th September 2011, 02:50 AM   #401
alazira is offline alazira  United States
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Default X202 positive modification

I managed to convert the X202 board to a positive reg
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Old 29th September 2011, 04:20 AM   #402
Salas is offline Salas  Greece
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Crafty. Why you went in to that trouble though? Used up one and got left with a positive board short for a double mono +Vcc project?
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Old 29th September 2011, 07:48 AM   #403
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I have placed in c101 220uF capacitor. I have a lot more other capacitor 470uf quality, I can place it without problems?
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Old 29th September 2011, 09:45 AM   #404
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Quote:
Originally Posted by albertob View Post
I have placed in c101 220uF capacitor. I have a lot more other capacitor 470uf quality, I can place it without problems?
For digital clock reg. till 1000uF
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Old 29th September 2011, 10:59 AM   #405
AndrewT is offline AndrewT  Scotland
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I have been trying to persuade the Group Buyers to adopt a single PCB for both the -ve and +ve regulated supplies.
With care, any of the existing PCBs can be converted to the other polarity.

I would rather buy all the PCBs identically and use the build manual to guide me to achieving which polarity I require.

But even that complication is not always required.

Simply build all -ve regulators and use a dual secondary to power the regs. This gives an equal or better performance Dual polarity regulated supply than having to buy specialised +ve & -ve PCBs and having the problem of "left overs".
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Last edited by AndrewT; 29th September 2011 at 11:06 AM.
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Old 29th September 2011, 11:20 AM   #406
Salas is offline Salas  Greece
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Alas, it could confuse enough users...
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Old 29th September 2011, 11:25 AM   #407
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Alas, it could confuse enough users...
I believe like Salas it's a little bit complicated for non advanced diyer's.
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Old 29th September 2011, 11:36 AM   #408
Salas is offline Salas  Greece
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Andrew could kindly write an extended guide post of his converting ideas here for those feeling like trying out when needed. We must also thank Andrew for his continuing contributions and help replies in many of threads in the course of many years by the way.
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Old 29th September 2011, 11:37 AM   #409
AndrewT is offline AndrewT  Scotland
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What's confusing about having one PCB and one set of instructions for building one polarity of regulator?
I cannot see that getting any simpler.

Now attach a pair of these simple to assemble regulators in series for a dual polarity supply. The only condition is that dual AC to DC supplies must also be provided. This is done with a dual secondary transformer and each secondary has it's own Bridge Rectifier. Again very simple instructions. Build either the single polarity (no options nor different PCBs) or build the dual polarity using the dual polarity diagram.

Anything that adds options/choices and needs further explanation is what makes the process more complicated.
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Old 29th September 2011, 11:39 AM   #410
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Salas View Post
Andrew could kindly write an extended guide post of his converting ideas here for those feeling like trying out when needed.
would a pic of the converted reg do as a taster?

It was the second PCB I assembled to prove to myself that the "conversion" was doable.
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