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Old 31st July 2006, 08:28 AM   #1
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Default Project Tube and ic amplifier PCB or kits
Project Tube and ic amplifier PCB or kits

I have a project using tube 6922EH(OR ECC88)as input buffer,
LM1875 as power output IC..I had finished the engineering working sample. You can get more information in AMP Chip ......
Now i am going to make a update version of the PCB, who is interesting in this project? I think the price of all the materials in the PCB will be controlled under 40$ including the tube,ic,and heating.......
Hope more froends will join in this project....
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Old 31st July 2006, 08:32 AM   #2
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Thumbs up some reference schematics
here are some reference sch...
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Old 31st July 2006, 08:33 AM   #3
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Default another SCH...
ANOTHER ONE...
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Old 31st July 2006, 08:35 AM   #4
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Default My engineering working sample
My engineering working sample.....
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Old 1st August 2006, 02:54 AM   #5
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Default Here are some pictures of the PCB with components
Here are some pictures of the PCB with components. The PCB size is 20*15cm, 1.6mm FR4 material.
The tube we can use 6922EH or 6DJ8 or ECC88 or E88CC or 6N11......
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Old 1st August 2006, 02:59 AM   #6
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Smile picture of the tube
picture of the tube .....below the tube is LM7806 for heating the "lamp" inside the tube.
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Old 1st August 2006, 03:06 AM   #7
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Default The relay part using LM7812
The relay part using LM7812 , when power on, the relays will be conected after around 10 seconds......during this 10 seconds, LM7806 is working and heating the "lamp" inside the tube...
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Old 1st August 2006, 03:09 AM   #8
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Default LM1875 IC
using two LM1875 IC for power ouput.....20W+20W power can be output when connected with 8_ohm impendence speakers...
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Old 1st August 2006, 03:12 AM   #9
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Default The rare side of the PCB........
The rare side of the PCB after soldering all the components.
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Old 1st August 2006, 03:21 AM   #10
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Default about the power supply
About the power supply:

20V~-----0V------20V~ 3A is suggested for LM1875.....(120W)

18V~-----0V------18V~ 3A can also be used in this case.

12V~ 0.5A is for the relay part. (6W)

8V~-----9V~ 1.0A is for the "lamp" inside the tube.(8W---9W)

So, the power of the transformer shall be around 150W in this case.
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