On Jun 13, 2008, at 12:31 PM, Marcel wrote:

> A [definitive circuit for a "lab" supply] does not exist because there
> is no lab supply that addresses all needs.

I want a copy of the ubiquitous 0-30V 0-3A (or 5A) CCCV "bench  
supply" that pretty near all the test equipment suppliers supply.   
They all seem to be about the same size, too, though they're probably  
limited by transformer, meters, knobs, and power dissipation issues  
rather than electronics complexity...

(So has anyone else noticed that surplus switching supplies are  
hitting price parity with 60Hz transformers of similar capacity?  For  
instance, you can get a 16VDC 3.75A switching supply for about $15,  
while a 12.6VAC 3A transformer is about $11...  The difference being  
that the 16VDC supplies show up in the trash after each generation of  
laptop "refreshes", while the 12.6VAC transformers are getting hard  
to find...)


> people get tired of re-inventing the wheel and just buy a suitable  
> bench supply.

Indeed.  My bench supply has been among the most useful of my impulse  
purchases, and when the first one broke I bought a new one right  
away.  But it would be nice to have a reference schematic to fix the  
old one using my stock of 317s...

BillW

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