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Old 1st December 2005, 10:03 AM   #21
Katapum is offline Katapum  Europe
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Hi,

Quote:
Might be an impedance mismatch between your DAC and gainclone, what design is it, ( the DAC)?
I made another test with a tuner and GC sounds is ok. What’s wrong with dac? I´m lost.



I attached my dacs buffer.
When I made my dac I only connected input AC filter and transformers screens to chassis so I didn´t connected to chassis any star grounds PCBs. is it a good procedure???

Katapum
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Old 1st December 2005, 04:44 PM   #22
doggy is offline doggy  Canada
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hello and greetings,

I have this transformer that is looking for a new home. It has 2 secondaries measuring 15 v ac, 20 v dc-no load. so about 19v dc.

I have built all kit amps and this will be my 1st point to point project.

Any suggestions for a good sounding, project? and schematic? Trying to keep the cost within reason and parts count low ; something similar to the original gaincard.

The chips I have used are: lm3875, lm4780, lm3886.

I have an enclosure in mind; it's going to be cube shaped.

cheers
doggy
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Old 2nd December 2005, 01:12 AM   #23
doggy is offline doggy  Canada
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I think I will use the lm3886; it's spec.'d to go as low as 18 volts; maybe try to build a good capacitor supply feeding smaller caps. near the chip. plan to use 4 diodes for rectifier.

should be a fun project,
doggy
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Old 4th December 2005, 09:47 AM   #24
Katapum is offline Katapum  Europe
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Hi,


Quote:
Might be an impedance mismatch between your DAC and gainclone, what design is it, ( the DAC)?


Quote:
What’s wrong with dac?
Quote:
I attached my dacs buffer.
Quote:
When I built my dac I only connected input AC filter and transformers screens to chassis so I didn´t connected to chassis any star grounds PCBs. is it a good procedure???

Help me please?

Katapum
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