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Old 7th February 2012, 03:18 PM   #11
mlloyd1 is online now mlloyd1  United States
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take a look at the DH100, an old hafler design:
http://hafler.com/techsupport/pdf/DH-100_preamp_man.pdf

mlloyd1

Quote:
Originally Posted by scafas View Post
hi , i need a very good schematic diagram for a MM preamplifier with split riaa for 5532 op-amp , can you help me?
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Old 10th February 2012, 07:35 AM   #12
scafas is offline scafas  Italy
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Default split riaa

ohhh yes , i want make it
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Old 10th February 2012, 03:43 PM   #13
scafas is offline scafas  Italy
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ok , this is my clone dh100 pcb Click the image to open in full size.
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Old 19th February 2012, 01:55 PM   #14
scafas is offline scafas  Italy
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Thumbs up hafler dh100 started

Hello everyone, I started to build Hafler DH100 clone.
and I 'left alone to build the section muting.
everything works perfectly and has a great sound.
before completing all, I saw that there are changes to improve the sound of the preamp, but I can not find detailed information on what to take.
Can you help me?
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Old 21st February 2012, 03:26 PM   #15
scafas is offline scafas  Italy
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Default ok , good sound

I switched the preamp yesterday and I must say that the first impression 'was very clean medium-high range.
control of tone and 'truly effective.
I am very satisfied.
assembly of the PCB and 'simple and everything worked the first try.


Click the image to open in full size.
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Old 30th March 2013, 05:03 PM   #16
scafas is offline scafas  Italy
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Default last definitive

this is my definitive version of hafler dh100 clone.
the pcb does not include the mute stage.
I am very happy with the sound it.
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Old 30th March 2013, 05:05 PM   #17
scafas is offline scafas  Italy
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Quote:
Originally Posted by scafas View Post
this is my definitive version of hafler dh100 clone.
the pcb does not include the mute stage.
I am very happy with the sound it.
Click the image to open in full size.
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Old 31st March 2013, 08:33 AM   #18
Calvin is offline Calvin  Germany
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Hi,

and where is the split RIAA you asked for in first place?

jauu
Calvin
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Old 31st March 2013, 09:42 AM   #19
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Quote:
Originally Posted by Holger Barske View Post
"5532" and "good MM RIAA" won't happen at the same time. Bipolar OPs are not very good candidates for high Z sources like MMs.
Sorry for bringing this quote back up again in this thread - but I am curious to why this is the case. From what impedance would this be troublesome (seeing you can load your pre-amp with something lower than the standard 47K). The reason I'm asking is that -for example- the NE5532 has a lower noise floor than the OPA2134.
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Old 31st March 2013, 10:05 AM   #20
Calvin is offline Calvin  Germany
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Hi,

read #7. Its all there already.

jauu
Calvin
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