nad 3020b idle current

reddish75 · 4th July 2008, 02:12 PM

hi, i would like to be able to adjust the idle current in my nad 3020b by using a pot, however my knowledge is very limited so im asking if anyone would point me in the right direction? heres the schematic for the 3020b

http://homepage.mac.com/planet10/man..._schematic.gif

thanks
chris

jaycee · 4th July 2008, 02:26 PM

If you mean, you are looking for a pot to tweak in the circuit, there isn't one.

If you mean you want to add one, then you would replace R645/646 with pots. You might also want to check if RX1 and RX2 are actually fitted and if so, what their values are.

reddish75 · 4th July 2008, 02:29 PM

sorry yes i want to add a pot any ideas on resistance? are those resistors the only parts i need to remove?

thanks

YFW · 4th July 2008, 02:35 PM

The spirit of NAD3020 is zero-adjustment and easy to maintain/manufacture.So I think it's not required to modify it.
If you insist to do this,you need to add a adjust bias circuit and emmiter resistors which will change the structure a lot.

reddish75 · 4th July 2008, 02:46 PM

yes its easy to maintain and adjust apart from the idle current which is fixed bias, so if this drifts the procedure to rectify this is tough to do for amutures like me, so adding a pot to adjust this current to recomended values would be great.

thanks

4th July 2008, 02:12 PM	#1
reddish75 diyAudio Member Join Date: Aug 2006	nad 3020b idle current hi, i would like to be able to adjust the idle current in my nad 3020b by using a pot, however my knowledge is very limited so im asking if anyone would point me in the right direction? heres the schematic for the 3020b http://homepage.mac.com/planet10/man..._schematic.gif thanks chris

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4th July 2008, 02:26 PM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	If you mean, you are looking for a pot to tweak in the circuit, there isn't one. If you mean you want to add one, then you would replace R645/646 with pots. You might also want to check if RX1 and RX2 are actually fitted and if so, what their values are.

4th July 2008, 02:29 PM	#3
reddish75 diyAudio Member Join Date: Aug 2006	sorry yes i want to add a pot any ideas on resistance? are those resistors the only parts i need to remove? thanks

4th July 2008, 02:35 PM	#4
YFW Account Disabled Join Date: Jun 2007	The spirit of NAD3020 is zero-adjustment and easy to maintain/manufacture.So I think it's not required to modify it. If you insist to do this,you need to add a adjust bias circuit and emmiter resistors which will change the structure a lot.

4th July 2008, 02:46 PM	#5
reddish75 diyAudio Member Join Date: Aug 2006	yes its easy to maintain and adjust apart from the idle current which is fixed bias, so if this drifts the procedure to rectify this is tough to do for amutures like me, so adding a pot to adjust this current to recomended values would be great. thanks