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Old 4th December 2011, 03:32 PM   #1091
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Quote:
Originally Posted by Tea-Bag View Post
240V Line IEC ----CL60---CL60---Trafo Red wires..
N-------------------------------------Trafo Black Wires
Bags ,

AC + before fuse .... then on the + of both secondaries before diodes ? Same as my amps basically ?

Rich
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Old 4th December 2011, 03:47 PM   #1092
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Right, Mine are after fuse. But I didn't need one on my Pearl2, but my reg is different.
I dont think it makes a difference, as long as they are there to slow the current coming in on the primary side
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Old 4th December 2011, 03:59 PM   #1093
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Thar can also be done this way:

IEC phase - fuse - cl60 - one leg of primary
Other leg of primary - cl60 - IEC neutral

Always have Earth from IEC directly to chassis ground by short thick wire.
Never defeat Earth to chassis connection.
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Old 4th December 2011, 04:16 PM   #1094
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Got it down to 500 mA with one CL 60 before fuse . So I can put another on primary Neutral and try a 250mA ?
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Old 4th December 2011, 04:59 PM   #1095
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Seems you have a 50VA xformer.

50/230= 0,217A more or less

This is the max current your xformer is intended to draw from the wall more or less

So, try adding another CL60 to the queue And pop in the 250mA slow blow fuse, be brave. If it stays still after 10 power on, then it's probably fine.

Pearl would never consume that amount of power anyway; you have high voltage film caps at the output, so even your DC coupled preamp wouldn't be destroyed in case of malfunction. I guess 250 mA slow is a pretty safe value.

If you can plug multimeter on Mains series with your circuit, (caution when doing this !!! Mains voltages can be hazardous) you can visualize the AC current draw on the line. Theroritically you could even go down to a 100mA fuse for a 50 mA continuous draw. After that all needed to know if the circuit has a biggest current draw at turn on ...

Circuit Ground can also be wired to Earth (Chassis) through a diode bridge. Or even diode bridge and cap paralleled I guess if noise issues.

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nAr
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Old 4th December 2011, 06:44 PM   #1096
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Thanks Guys .... it appears to working fine with 2 x CL60 in series with 250mA fuse .

Next step Please ?



what did I learn today .... AC divided by VA = A of fuse needed ?

Rich

Last edited by richluvsound; 4th December 2011 at 06:47 PM.
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Old 4th December 2011, 06:58 PM   #1097
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Quote:
Originally Posted by richluvsound View Post
Thanks Guys .... it appears to working fine with 2 x CL60 in series with 250mA fuse .

Next step Please ?



what did I learn today .... AC divided by VA = A of fuse needed ?

Rich

Nope atoll .

VA Rating VA / AC line V = I A draw @ max. xformer current
It is the equivalent in AC to the Ohm law I = P / U

Next step ? Have you done the I/Os, and maybe ... listen to it ???

Glad to hear for the 2 CL60 working together

Best,

nAr
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Old 5th December 2011, 01:43 PM   #1098
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I will be using the original PSU schematic from Wayne (2x24V transformer in my case). Would thermistors be a good idea in this setup too? Where in the schematic would I have to mount these? (I see a max C of 1250 uF @240V AC for the CL60)
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Old 5th December 2011, 03:45 PM   #1099
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I have been checking voltages against Schematic .... ?

I have a flickering LED on one board .Measuring is nigh on impossible ? I have tried tracing it back ,but I'm at the edge of my knowledge .

On the other board I have a drop on Q3 ... I should be reading 10 VDC and I'm getting 1.3 VDC


Also , setting P1 ? I have + on pin and - on PAD ground is this correct , If so, why is my meter all over the place ?

HELP PLEASE ?

Rich
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Old 5th December 2011, 07:58 PM   #1100
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Sorry, PC is off, work tomorrow, I'll try to look by tomorrow evening.
Best,

nAr
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