[Pars]

Hi,

I am getting ready to build up a dynamic on a V2 board I got from Justin (back when he sold boards), and had a question regarding the transformer. The Amveco recommended (TE62074) is rated at dual 18V secondaries, 1.944A (35VA tranformer). Digikey has these backordered until February (Justin must be busy

).

I have always heard that Plitron's are good. Would a 50VA Plitron with dual 117V primaries and dual secondaries at

027014201 18V 18V 1.39A

be a good substitution? The original tranformer in the headwize article was 36V 1A per secondary. Or, should I go with an 80VA unit with 18V 2.22A secondaries?

One other option is a little radio shop in NYC (Leeds) has a 225VA Plitron for $30, but it is 18V 6+A secondaries, and is kinda large. Would I need to go with larger spec'd rectifiers with this one, or is the current determined by the device (amp)?

Excuse the newbie type questions, but this is the first PSU I've done.

Thanks,

Chris

[EDIT] fixed part number

 

[dip16amp]

I just checked digikey for TE62064-ND and they have 108 of them.

 

[Pars]

Quote:

Originally Posted by dip16amp I just checked digikey for TE62064-ND and they have 108 of them.

Ooops, it was the 62074, not 62064.

 

[dip16amp]

Maybe the TE62084-ND would also work?

There is also the TE70074-ND and TE70075-ND.

 

[Pars]

The 62075 is another one that Justin has used. I didn't want to go to the enclosed ones (70074 and 70075). I think the 62064 would probably be OK, but at this point I am kinda leaning towards the 50VA Plitron, even though it is more expensive. I wanted to keep the voltage down at 18V instead of 22V (62075) to help keep the regulators cooler with less drop across them.

 

[dip16amp]

Yes, the current through the rectifiers is determined by what the amp will pull.

 

[Pars]

Quote:

Originally Posted by dip16amp Yes, the current through the rectifiers is determined by what the amp will pull.

Yeah, thats what I thought, though putting in a transformer capable of 6.25A using 31DQ10 Schottky's for rectifiers seems like a magic smoke go bye-bye waiting to happen if something were to go wrong. On the other hand, diodes are cheap. But the 50VA Plitron is $50+ versus the $30 for the 225VA from Leeds... oh well.

Going thru back threads on both here and headwize, it appears that the Gilmore Dynamic draws <200ma per side, so I would think the 50VA Plitron would be more than sufficient. Anyone having a different opinion please chime in.

And thanks for your responses dip16amp.

Chris

 

[Garbz]

I used a 50VA with 2x25v secondaries. It works fine but i may just add that the powersupply burns a lot of power. I got a massive heatsink on the voltage regs. They get damn hot!