[Heath] The Heathkit IP-27

[Neil Morrison]

From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>

> I am now toying with the idea of completely reversing the polarity of every polarity-sensitive 
> device in this power supply, and substituting Silicon NPN transistors with almost identical 
> specifications for ALL the PNP Ge devices.

Don't do this. Replace the transistor with your best guess (but cheap). If that doesn't work, figure out why and make an adjustment.

> I have yet to find a decent schematic of a more modern design for a switchable, variable-
> voltage variable-current supply with current-limiting, or I would simply use the main power 
> supply as the source and replace everything else with a more up-to-date circuit.

http://www.siliconchip.com.au/cms/A_102445/article.html

http://www.siliconchip.com.au/cms/A_112014/article.html

Neil


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