My Pearl One. Some questions

[blackdod]

Hi guys!

This is my first post and I would like to show my Pearl One :

https://picasaweb.google.com/1150424...65708755140994

https://picasaweb.google.com/115042429352783535448

I have some questions and I want to know if anyone can help me.

At the output of the power supply, I check about 48 volts DC, is this value is correct? This voltage is it safe for the circuit?. I'm using basically the scheme of the unregulated supply (Pearl One PDF page 3, Fig 4):

A pair of Diodes 2KBP01M, capacitors (Nichicon Gold Tune, 10.000 uF), and a pair of Wima MKS4.

My R-core have an output of 30 volt but when I checked, the output have 34 volt AC.


Thanks and regards

[Zen Mod]

as long as your Nichicon and Wima caps , then C1-C4 are up to voltage ( say 63V ) , you're good

observe temp on Q1 , too

Papa's rule - finger - 5sec , is good enough

( save this pic - it's handy )

[nar]

Originally Posted by blackdod

Hi guys!

This is my first post and I would like to show my Pearl One :

https://picasaweb.google.com/1150424...65708755140994

https://picasaweb.google.com/115042429352783535448

I have some questions and I want to know if anyone can help me.

At the output of the power supply, I check about 48 volts DC, is this value is correct? This voltage is it safe for the circuit?. I'm using basically the scheme of the unregulated supply (Pearl One PDF page 3, Fig 4):

A pair of Diodes 2KBP01M, capacitors (Nichicon Gold Tune, 10.000 uF), and a pair of Wima MKS4.

My R-core have an output of 30 volt but when I checked, the output have 34 volt AC.


Thanks and regards

Hi Blackdod,

If your Pearl works fine there is nothing to worry about

More technically, all depends which voltage value you get after the regulation. An input of 45-46V is quite correct before reg, so your value seems fine at a first glance.

Better check voltage onboard, e.g. for example between Q1 drain and ground you should measure 29V or so. If not, the discrete regulator is likely to have a problem and you'll have to debug this

Best,

nAr

[6L6]

Wow! Very nice build!
I like your selector for input loading resistor.

[blackdod]

Hey guys

Thanks for your answers.

Right now I'm thinking of remaking the selector to make it look a little more professional.

Today I will do my first listen to the final assembly... I hope not to have any problems.

Regards

[Salas]

Nice. But don't link too big images, they change the reading frame and are difficult to some. I made those to attachments so they never get lost as expired links even. Also, other guys don't quote along with same images if in same page. Thanks.

[blackdod]

Originally Posted by Salas

Nice. But don't link too big images, they change the reading frame and are difficult to some. I made those to attachments so they never get lost as expired links even. Also, other guys don't quote along with same images if in same page. Thanks.

Sorry Salas

Thanks and regards

[blackdod]

Hi Guys

After a few hours, I have the same problem on both plates . I heard a noise and saw that the IRF9510 was burned. I've replaced and now I have +29.5 volt regulated again after the R8. Until this point everything well.

The problem I see now is that the R17 (14 volt) and R14 (19,5 volt) I have a voltage of 29 volts!

On the other hand, in the C7, I have a value of 26 volts (I assume that this value can be considered normal), but in the C8, I checked 29 volt again.

Is it possible that ZTX450 are wrong? I do not understand how the scheme after the R14 indicates a value of 19 volt and 29 volt I always check here.

Any ideas??

Thanks

[Zen Mod]

something is wrong

double check your measuring , give us exact schematic , write measured voltages on schematic .

if you're using winbooze , use paint

here it is - save this sch and open with Paint ; use red color for your numbers

[blackdod]

Hi

The data that I could check. They are all on PAD2 - (pin negative)



Regards