NAP-140 Clone Amp Kit on Ebay - Page 54

zabadac · 18th April 2010, 09:33 PM

I believe the circuit is updated - see this webpage:
Audiophile Power Amplifier modules from Avondale Audio : avondale audio

Circuit attached.

Ruwe · 18th April 2010, 10:32 PM

PhaseLockLoopy,
Keep us posted. It's interesting to know the result of your changes. The Douglas Self's book has a lot of information about this same basic schematic, and lots of developments and improvements. Still, I read sometimes mixed reviews about his "Blameless" amp. I'm very curious though!

gaborbela · 19th April 2010, 12:39 AM

Hello

Zabadac you posted the same circuit I did before !
These need DC protection !
When I turn it of after 1 minute I can measure 6-7DCV on the speakers terminal.
Otherwise sound great and works great . Of course I tested 4 different power transistors a lot of other parts . It is really sensitive to almost all parts it use .
I played over two weeks testing , testing and more testing new parts .

Greets

audiodesign · 19th April 2010, 12:31 PM

My test with Aussie modules

Cheap hi-end system

PhaseLockLoopy · 19th April 2010, 12:39 PM

If it is a switch off issue - soft start circuit (depending on the relays you chose - 2x DPDT can double to disconnect the speakers at the point of switch off and on at the point

so Soft start relay is timed at say 800mS
and speaker relay 100mS behind that

though at switch off the speaker relay will drop first

no complex DC measurement or balanced rail comparator

though even this may not be inexpensive in parts or time.

A crowbar circuit is relatively cheap- but I personally have never liked them
the good old triac across the speaker outs to create a short circuit I've always thought of as madder than my avatar.

lanchile · 20th April 2010, 12:17 AM

Quote:

Originally Posted by audiodesign

My test with Aussie modules

Cheap hi-end system

Very nice! I have those too and I am very happy with them.

barry.childs · 9th July 2010, 05:17 PM

I thought I might help see this thread continue so I have just ordered the naimclones. Will report back once I know what ones they are (hoping they are the avondale copies). I recently completed two of the Goldmund clones. Superb amps. It will be interesting to compare with the naim.

barry.childs · 12th July 2010, 08:38 PM

Well I built the clones. They are the original Avondale types. All went well and they work. Just one problem. I'm supposed to set 6-10mv accross the 0.22ohm resistor but all I get is 0.5mv and adjusting the pot doesn't alter it. (meter set on 200mv dc) If anyone out there can help me I would be most obliged. Please explain like you are talking to a monkey.

2Bak · 13th July 2010, 06:09 AM

Keep turning the pot, Barry.
Finally you'll get there.

Jan

barry.childs · 13th July 2010, 07:31 AM

Cheers Jan, I never realised these pots turn so far. I was afraid I was giving it a big dose of dc and not able to measure it. It sounds great now. Thanks very much for your quick and helpful reply. My next question is a general one realy. I don't know if a pre-amp is neccessary. I never used one on my gainclones or goldmund clone, and although the naimclone sounds good would a pre-amp improve it. (I see their is even a naimclone pre-amp on ebay) Does impedance matching do anything these days. Comments very welcome. Regards Barry

19th April 2010, 12:39 PM	#535
PhaseLockLoopy diyAudio Member Join Date: May 2008 Location: On a mushroom	If it is a switch off issue - soft start circuit (depending on the relays you chose - 2x DPDT can double to disconnect the speakers at the point of switch off and on at the point so Soft start relay is timed at say 800mS and speaker relay 100mS behind that though at switch off the speaker relay will drop first no complex DC measurement or balanced rail comparator though even this may not be inexpensive in parts or time. A crowbar circuit is relatively cheap- but I personally have never liked them the good old triac across the speaker outs to create a short circuit I've always thought of as madder than my avatar. __________________ Hum likes to have a nice "Noise to Signal" ratio To "Hum" is to be noticed Quality hum is when it pours out of Electrostatic speakers

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18th April 2010, 10:32 PM	#532
Ruwe diyAudio Member Join Date: Aug 2008 Location: Vancouver, Canada	PhaseLockLoopy, Keep us posted. It's interesting to know the result of your changes. The Douglas Self's book has a lot of information about this same basic schematic, and lots of developments and improvements. Still, I read sometimes mixed reviews about his "Blameless" amp. I'm very curious though!

19th April 2010, 12:39 AM	#533
gaborbela diyAudio Member Join Date: Sep 2005	Hello Zabadac you posted the same circuit I did before ! These need DC protection ! When I turn it of after 1 minute I can measure 6-7DCV on the speakers terminal. Otherwise sound great and works great . Of course I tested 4 different power transistors a lot of other parts . It is really sensitive to almost all parts it use . I played over two weeks testing , testing and more testing new parts . Greets

19th April 2010, 12:31 PM	#534
audiodesign diyAudio Member Join Date: Sep 2005	My test with Aussie modules Cheap hi-end system

9th July 2010, 05:17 PM	#537
barry.childs diyAudio Member Join Date: Jun 2008 Location: Lostwithiel, Cornwall	I thought I might help see this thread continue so I have just ordered the naimclones. Will report back once I know what ones they are (hoping they are the avondale copies). I recently completed two of the Goldmund clones. Superb amps. It will be interesting to compare with the naim.

12th July 2010, 08:38 PM	#538
barry.childs diyAudio Member Join Date: Jun 2008 Location: Lostwithiel, Cornwall	Well I built the clones. They are the original Avondale types. All went well and they work. Just one problem. I'm supposed to set 6-10mv accross the 0.22ohm resistor but all I get is 0.5mv and adjusting the pot doesn't alter it. (meter set on 200mv dc) If anyone out there can help me I would be most obliged. Please explain like you are talking to a monkey.

13th July 2010, 06:09 AM	#539
2Bak diyAudio Member Join Date: Apr 2002 Location: Denmark	Keep turning the pot, Barry. Finally you'll get there. Jan

13th July 2010, 07:31 AM	#540
barry.childs diyAudio Member Join Date: Jun 2008 Location: Lostwithiel, Cornwall	Cheers Jan, I never realised these pots turn so far. I was afraid I was giving it a big dose of dc and not able to measure it. It sounds great now. Thanks very much for your quick and helpful reply. My next question is a general one realy. I don't know if a pre-amp is neccessary. I never used one on my gainclones or goldmund clone, and although the naimclone sounds good would a pre-amp improve it. (I see their is even a naimclone pre-amp on ebay) Does impedance matching do anything these days. Comments very welcome. Regards Barry