WOPL dual 500

[grapplesaw]

So the THD+N is very low .008 at 2.7 volts 005 at 5 volts which is great. The D.C. Offset is .2mv. Bias is very stable and changes by .025 mv from low rail to high rail voltage which is good.


will put the Meter board on next and then bring up the output.

got to look for those parasitic destortions in the 10-20k range. I hope not to find any.

 

[laatsch55]

Yeah, I hope they are gone too!!

 

[grapplesaw]

tune time

Well after a good bench test it is playing now.

So it did not have any paristac oscillations up to 20k
bias is set at .350v
D.C. Offset is .2-.5 mv

output
565 watts at high rail
275 watts at low rail

117 line voltage

 

[laatsch55]

That's a beast!!

 

[Billboard]

Fantastic work, what is High rail, and low rail?

 

[grapplesaw]

That's a beast!!

A Black Beast

 

[grapplesaw]

Fantastic work, what is High rail, and low rail?

The amp has two rail voltages. Low 80 volts and high 120 volts. So at low rail it's like a 400 with 18 drivers per channel. And at high a 700 on steroids

 

[laatsch55]

Nice amp Glen!!

 

[grapplesaw]

Nice amp Glen!!

Thank you Lee

 

[laatsch55]

You put a ton of work in that one....

 

[grapplesaw]

You put a ton of work in that one....

Its kind of like "Electro Art".

I wanted to create something original.

 

[laatsch55]

Well, you certainly did that bud....it's perrrrrrrty....

 

[grapplesaw]

May need to add a soft start

The amp plays beautifully. But I do have a problem.
Keeps blowing fuses. I had 10 amp in which is smaller than required. It wants 16 amp fast blow ABC style fuses. I up graded to 15 amp and worked fine till now and blew again. I have checked the outputs and no bad ones there that I can find.

I put in two 33,000uf main caps in this build. This maybe to big of a load for startup. I will get some 16 amp but do not think it will be a fix.

I will I'll run up on the dim bulb tester to confirm outputs being ok.

 

[laatsch55]

Main fuse problems, not rail fuse problems??

 

[grapplesaw]

Main fuse problems, not rail fuse problems??

That's right Lee. Put in new one it works. After a few actuation blows at an instant when switching on.

 

[laatsch55]

Are you using slo-blos??

 

[grapplesaw]

Are you using slo-blos??

No
Fast blow. As per operator manual


http://www.cooperindustries.com/con...uct-datasheets/Bus_Elx_DS_2000_ABC_Series.pdf

 

[laatsch55]

Fast blow's in the mains dont sound right, BECAUSE you have inrush, why would it be any different on a D-500 from a 700?

 

[grapplesaw]

Fast blow's in the mains dont sound right, BECAUSE you have inrush, why would it be any different on a D-500 from a 700?

I am with you.

I just ran it up with the DBT. Although at full power a 50 watt is not so dim all looked good. I powered it up slowly and after about 60 volts rail and got good sine wave.

The other 500's fire up good with fast blow but only have 15,000 uf caps where this has 33,000 caps

I will pick up some slow blow fuses and report back.

 

[laatsch55]

Sounds good....