"Tenna" PS-20 power supply

[KF4SQB]

Does anyone have a schematic of the "Tenna" Phase III PS-20 power supply? If anyone has a schematic for a Pyramid PS-20 supply, it may be the same. This unit is a 120 VAC to 13.8 VDC @ 17A continous (20A surge) power supply with no crowbar or other "protection" circuit. Just a "plain Jane" regulator circuit using 3055 pass transistors and an ECA723E regulator IC. I'm pretty sure the '723 is bad, but would like a schematic to do some more detailed troubleshooting.

 

[audioguru2]

We have a 13.8V/10A power supply using the LM723 driving three 2N3055 transistors in our Projects section. http://www.electronics-lab.com/projects/power/027/index.html

Your circuit might be the same but using more transistors.

 

[ante1]

This is a strait forward PSU, I am sure you can find all you need in the datasheet for the LM723. This datasheet covers all the basic circuits for the 723: http://eu.st.com/stonline/books/pdf/docs/4553.pdf

 

[hotwaterwizard2]

Here is one I found on a web search

 

[ante1]

That

 

[hotwaterwizard2]

How about this one?

http://www.uoguelph.ca/~antoon/circ/ps3010/ps3010a.html

 

[ante1]

Perfect! This article is an in depths walk through of the 723 internals and the surrounding circuitry!