No NFB line amp (GainWire mk2)

[dadod]

Any alternative part for DN2540?

Supertex has some more depletion mode TO220 mosfet, take a look in Supertex data sheets. Other producers I don't know.

 

[didiet78]

Any alternative part for DN2540?

Maybe use irf610/9610 but you must change ccs circuit, like salas shunt or juma psu. CMIIW

 

[thimios]

What is the specifications for power supply transformer?

 

[dadod]

What is the specifications for power supply transformer?

15 to 30 VA 2x15 V (two separate secundars)

 

[thimios]

15 to 30 VA 2x15 V (two separate secundars)

2x15V,2X30VA?

 

[dadod]

2x15V,2X30VA?

No, transformer 15 to 30 VA with two secondary windings with 15 to 17 V AC.

 

[thimios]

No, transformer 15 to 30 VA with two secondary windings with 15 to 17 V AC.

Ok thanks.

 

[thimios]

Gain Wire Mk2 test

Testing GainWire. Power supply +/-15v (two separate regulated power supplies)
Please keep in meant, this is what my sound card can measure.
Where J1,J2 are the jumpers settings.
Right Mark test is at J1 position.

 

[dadod]

Testing GainWire. Power supply +/-15v (two separate regulated power supplies)

You don't say in what mode you did the measurement, CFA or NGNFB?

 

[dadod]

You don't say in what mode you did the measurement, CFA or NGNFB?

OK, I see it now.

 

[thimios]

You don't say in what mode you did the measurement, CFA or NGNFB?

Too late to editing.
Picture number 1)CFA
2)NGFA
3)CFA
All the RightMark audio anal. in CFA Mode.

 

[bcarso]

Supertex has some more depletion mode TO220 mosfet, take a look in Supertex data sheets. Other producers I don't know.

Infineon has a few parts in SM including SOT223, but apparently no TO220.

 

[thimios]

Infineon has a few parts in SM including SOT223, but apparently no TO220.

Ιf i'm lucky i will have some in 4 weeks at least ,otherwise i will have another semi-finished board🙁🙁
PayPal isn't working for us in Greece.

 

[jwilhelm]

How is mail service into Greece? I think I have some spares I can send you.

 

[thimios]

How is mail service into Greece? I think I have some spares I can send you.

My friend ....!
We can receive everything but we can't pay because of capital control.🙁

 

[jwilhelm]

PM me your mailing address. They're cheap here.

 

[dadod]

It looks that Microchip Acquired Supertex, Inc. now.

 

[jwilhelm]

Mine are Microchip.

 

[thimios]

PM me your mailing address. They're cheap here.

You have PM🙂

 

[thimios]

I'm closer to finished.

Hi Jeff.I'm curious to know if this board is tested or not as you are very busy.🙂