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Old 10th June 2007, 07:51 PM   #1
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Default My Pearl Phono Section

Following Promitheus Pearl Group Buy, see Pearl phono PCBs Group Buy
I started my Pearl phono stage. It will have a separate power supply using a Plitron transformer. Here the complete Power supply:
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Old 10th June 2007, 07:53 PM   #2
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Here the inside of the Power Supply, really compact.
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Old 10th June 2007, 07:55 PM   #3
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I'm using an EMI filter and a AC inlet with built-in fuse socket. The power supplies grounds will be connected inside the preamp directly at the ground lug. The power cable is also shielded using two complete separate pairs, one per supply. A screw terminal is used to connect all of the transformer wires, the AC input lines and the EMI filter.
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Old 10th June 2007, 07:57 PM   #4
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I modified one of the PCB to supply a front panel Power-On red light. I'm using a small header 2 pins connector for the led.
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Old 10th June 2007, 08:22 PM   #5
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Nice work there!! Very tidy indeed!!

Jon
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Old 10th June 2007, 08:55 PM   #6
Manu is offline Manu  Europe
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Beau travail. Bravo!
Manuel
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Old 10th June 2007, 09:25 PM   #7
Stevox is offline Stevox  Netherlands
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Looks very very good... nice solution for the power led.
By the way, what value are you using for the resitor for the led.

peter.
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Old 10th June 2007, 10:52 PM   #8
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Thanks for your nice comments. The led resistor is 10K. I also added a resistor of 33K, 1/2W under the big 10000uF cap to drain the supply after power down. I already burn my nice side-cutter blade because I discharged by accident the big cap with it...

To install the led header and resistor, I made sure that one pin of the header was solder to the V+ trace and that one led of the resistor was connected to the GND pcb trace. Then the other resistor leg hold the header other pin. It is working well. The PCB seems to be original...See the image for details.

For the one that want to know the enclusure is from Hammond. It is tough, rather nice looking, easy to work with and shield the transformer stray field because it is made of steel. You can get it easily from Digikey, Part No: HM336-ND.
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Old 10th June 2007, 11:01 PM   #9
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Here the led, burning bright
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Old 4th July 2007, 02:14 AM   #10
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I completed the assembly of both PCB, normal Pearl and MC Option. The kit supplied by Prometheus was perfect, no part was missing or incorrect. Here the maain Pearl PCB (MM section)
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