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Old 20th January 2011, 09:13 PM   #1
boudy is offline boudy  United States
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Default Dual AD1865 balanced out DAC

I'm digging raindrop_hui's single AD1865N-K DAC board (modified of course) and recently found this offering on the bay:

DAC AD1865, AD1865 NOS 2.0 Balanced output - eBay (item 320643827034 end time Jan-26-11 09:05:22 PST)

Since I'm running a diff input amp it seems like a natural.

Has anyone given it a whirl yet?
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Old 26th January 2011, 01:52 AM   #2
xyphen is offline xyphen  United States
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Anyone out there try this yet? I'm interested too.
I've been looking at this thing for a while. I'm planning to use a pair of transformers for the output stage.
The biggest problem I've had is finding a power transformer with the right windings. The seller does carry one but it'd be an extra $50 to $60 with shipping.
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Old 2nd February 2011, 02:17 AM   #3
xyphen is offline xyphen  United States
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Ok, looking at the datasheet for the AD1865 and it has both I and V out. I'll have to ask the seller which output this board uses. If it's using the V outs, then I'm going to pass.
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Old 2nd February 2011, 02:26 AM   #4
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It he was using the current outs then I bet he'd mention which opamp was doing I/V. He doesn't, so I think its V outputs.
The heart ... first dictates the conclusion, then commands the head to provide the reasoning that will defend it. Anthony de Mello
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Old 2nd February 2011, 09:56 PM   #5
xyphen is offline xyphen  United States
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He lists it as not including an analog stage.

I messaged him and he said it used I out.

I'm looking at using this as a dac for headphone amps so I can probably get away with a passive i/v with transformer setup. I won't need the voltage gain that you get with other topologies.
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Old 3rd February 2011, 03:30 PM   #6
Art is offline Art
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I built like this, few years ago. 2x AD1865N-K as differential DAC, CS8412 DIR, LM4562 IV, with synchronous reclocking. I also built balance ECC82 preamp and 12AY7-E182CC-TZ40 PP amp, to match set with DAC. Sound really realistic and background very quiet.

I'm happy to share any information, if you're interesting.
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Old 31st July 2012, 10:59 AM   #7
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I am considering one of Raindrop's AD1865 boards, and would appreciate any assistance in making a choice.

1. AD1865 NOS with dicrete FET output
2. AD1865 NOS with transformer and SRPP output
3. AD1865 NOS Dual balanced - no outputs.

I have a pair of 1:2 centre-tapped transformers that I could use to replace the telephone-grade units on option2, or to convert the balanced output option3 to single-ended. Or I could use option1 as is.

Really battling to decide. I have a single ended 300B amp driving vintage Lowther speakers.

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