Help! Hafler DH102

baldrick · 12th December 2008, 07:54 PM

I've had the good fortune to come across a PCB for the ever elusive DH102 head amp that mounts inside the DH101.

Problem is that the circuit diagram and the parts layouts on these boards just don't exist anywhere.

My PCB is empty, and I'd love to build it up and run it.

Any DH102 owners out there that could provide a parts list and layout?

Thanks in advance!

mmerig · 21st January 2009, 08:13 PM

I have the DH102, and did some modifications (mainly caps at the input). I noted the original components and could provide you with the layout and parts list. What format will work for you (jpg, etc.)?

baldrick · 22nd January 2009, 04:42 PM

I'd love that info. Every little bit helps!

Thanks in advance.

mmerig · 24th January 2009, 01:19 PM

I could post what I have on the forum, as this would benefit more people; my only concern is Hafler's intellectual propoerty rights. The last time I checked, including an email to them, Hafler had nothing on the DH102. The DH102 is old, and Hafler has lots of schematics etc. on their website for other DH vintage products, but I leave it to a moderator to advise me before I post what I have on the forum which is:

1) Hafler's operating and installation instructions for the DH102 for installation in the DH101

2) A schematic and stuffing guide I derived from the board (not included in above)

3) A scan of the non-component side of the board

The schematic follows the board layout, and it could probably be simplified.

There is a muting circuit on the DH102, but I did not complete this on the schematic (I put my DH102 in the DH110, which has its own muting). I could complete the muting circuit, but it will be a week or so before I get to it.

baldrick · 28th January 2009, 02:23 PM

Considering its age and the fact that the parent company:

a) does not support it any more
b) has no data on it
c) doesn't seem to care that dozens of people are selling copies of documents they freely give away on their site

It should be considered public domain, IMHO.

Zen Mod · 28th January 2009, 03:00 PM

sch

Zen Mod · 28th January 2009, 03:01 PM

copper
150x70mm

Zen Mod · 28th January 2009, 03:03 PM

placement

these files are old .......... scanned yrs ago .

I still have that DH112 , but it's not handy right now .

baldrick · 28th January 2009, 03:48 PM

You are the MAN, Zen, thanks.

baldrick · 28th January 2009, 03:48 PM

It appears at first glance that the DH102 DH111 and DH112 are pretty much the same thing.

12th December 2008, 07:54 PM	#1
baldrick diyAudio Member Join Date: Dec 2008	Help! Hafler DH102 I've had the good fortune to come across a PCB for the ever elusive DH102 head amp that mounts inside the DH101. Problem is that the circuit diagram and the parts layouts on these boards just don't exist anywhere. My PCB is empty, and I'd love to build it up and run it. Any DH102 owners out there that could provide a parts list and layout? Thanks in advance!

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21st January 2009, 08:13 PM	#2
mmerig diyAudio Member Join Date: Jan 2005 Location: south east Idaho, Teton Basin	I have the DH102, and did some modifications (mainly caps at the input). I noted the original components and could provide you with the layout and parts list. What format will work for you (jpg, etc.)?

22nd January 2009, 04:42 PM	#3
baldrick diyAudio Member Join Date: Dec 2008	I'd love that info. Every little bit helps! Thanks in advance.

24th January 2009, 01:19 PM	#4
mmerig diyAudio Member Join Date: Jan 2005 Location: south east Idaho, Teton Basin	I could post what I have on the forum, as this would benefit more people; my only concern is Hafler's intellectual propoerty rights. The last time I checked, including an email to them, Hafler had nothing on the DH102. The DH102 is old, and Hafler has lots of schematics etc. on their website for other DH vintage products, but I leave it to a moderator to advise me before I post what I have on the forum which is: 1) Hafler's operating and installation instructions for the DH102 for installation in the DH101 2) A schematic and stuffing guide I derived from the board (not included in above) 3) A scan of the non-component side of the board The schematic follows the board layout, and it could probably be simplified. There is a muting circuit on the DH102, but I did not complete this on the schematic (I put my DH102 in the DH110, which has its own muting). I could complete the muting circuit, but it will be a week or so before I get to it.

28th January 2009, 02:23 PM	#5
baldrick diyAudio Member Join Date: Dec 2008	Considering its age and the fact that the parent company: a) does not support it any more b) has no data on it c) doesn't seem to care that dozens of people are selling copies of documents they freely give away on their site It should be considered public domain, IMHO.

28th January 2009, 03:48 PM	#9
baldrick diyAudio Member Join Date: Dec 2008	You are the MAN, Zen, thanks.