What’s the minimum power transformer required to build a gainclone amplifier?

[Katapum]

Hi,

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

[doggy]

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

[doggy]

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

[Katapum]

Hi,

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

What’s wrong with dac?

I attached my dacs buffer.

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