help me about NP D-1

[crt]

hallo everyone
sorry for my poor english

i almost finish to build Pass D-1 I/V (single version) with Shunt Reg. (salas)

[IMG][/IMG]

click here for bigger image

http://img25.imageshack.us/img25/7227/p1030083copy.jpg


i have several question :
-20 K pot for ?
-i had buy 20 IRF610 and want to match them.
if i want to get 4 match, should i buy some more ?
and how to match them ? (i already read pass labs article about matching MOSFET but still confuse) at what current should i match them ?
-for output caps, can i ignore it ?
i will use Pass B-1 buffer that already have a DC blocking caps.

Right now, i dont have a DAC yet .
but i planning to use it with PCM1704

Regards
La Ode

[bakpaosiomay]

Originally Posted by crt

hallo everyone
sorry for my poor english

i almost finish to build Pass D-1 I/V (single version) with Shunt Reg. (salas)

[IMG][/IMG]

click here for bigger image

http://img25.imageshack.us/img25/7227/p1030083copy.jpg


i have several question :
-20 K pot for ?
-i had buy 20 IRF610 and want to match them.
if i want to get 4 match, should i buy some more ?
and how to match them ? (i already read pass labs article about matching MOSFET but still confuse) at what current should i match them ?
-for output caps, can i ignore it ?
i will use Pass B-1 buffer that already have a DC blocking caps.

Right now, i dont have a DAC yet .
but i planning to use it with PCM1704

Regards
La Ode

- 20k pot is for adjust dc at input to 0v.
- i think its better to use out caps at d1
but you can ignore input caps at b1

btw bole minta eagle file ny pak?
hehehehehe

[meezger_seep]

Selamat siang!

-i had buy 20 IRF610 and want to match them.
if i want to get 4 match, should i buy some more ?
and how to match them ? (i already read pass labs article about matching MOSFET but still confuse) at what current should i match them ?

If your IRFs are from the same wafer 20 should be suficient.

For matching it's best if you use the same voltage and current you will operate them later.

Best wishes

Ralf