Low-distortion Audio-range Oscillator - Page 38 - diyAudio
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Old 13th September 2012, 10:01 PM   #371
richiem is offline richiem  United States
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Understood. I'm old school about some things too.
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Old 13th September 2012, 10:46 PM   #372
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I don't think an active opamp bandpass filter would add that much noise. I've been simulating a two stage filter, and the NE5534 is again a very good choice. I like this because I don't have to make a huge investment in copper wire in order to make a passive one.
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Old 13th September 2012, 10:53 PM   #373
richiem is offline richiem  United States
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Definitely easier to make. Although the 5534 is one of my faves, I'd suggest an LME49710 or its dual (4562?) or LT1468 for minimum distortion, which is the issue at stake here.
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Old 14th September 2012, 12:45 PM   #374
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Quote:
Originally Posted by richiem View Post
Definitely easier to make. Although the 5534 is one of my faves, I'd suggest an LME49710 or its dual (4562?) or LT1468 for minimum distortion, which is the issue at stake here.
Thanks. Yeah, the LME49720 is a good opamp.

I just hate waiting around for parts to show up in the mail. That's one of the downsides of this hobby: virtually everything has to be mail ordered.
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Old 14th September 2012, 03:56 PM   #375
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So, building stuff takes a long time because everything has to come through the mail. sigh.
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Old 14th September 2012, 08:38 PM   #376
rsavas is offline rsavas  Canada
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Default Low distortion oscillator

Hello,

Have you looked at the oscillator circuit in the Amber 3501?
Manual is available from Index of /manuals
I also have a printed copy of the manual, as well.
I have one of these and I measure its internal oscillator at ~0.0008% and it has not been adjusted since is it was done at the factory back in the 80's.
Only problems, that I have had is a couple of tantalum caps blow, easy to find them, just by looking around and smelling Last week one went inside the shielded DC/DC converter pcb.
The majority of the parts are NE5534 parts!! & old Motorola transistors, 2N4401/3

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Old 14th September 2012, 09:55 PM   #377
1audio is offline 1audio  United States
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I just picked up one of those Ambers as well. I have not figured out the 2nd harmonic cancelling circuit yet. There are two on eBay right now for pretty good prices.
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Old 14th September 2012, 11:10 PM   #378
rsavas is offline rsavas  Canada
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Searched eBay, did not find an Amber 3501, what am I doing wrong?
Yes the Amber designer/s knew their analog circuit design very well. I wish I was as smart
I like the pre-amp design and the output amplifier.

Oscillator circuit , obviously works well!!Yet another one to figure out.
I start looking at the parts, the only two that I saw that are out of date. CA3280 OTA went obsolete in 2005. The MPQ6542 is obsolete as well.

I think that the pre-amp can be adapted for a good phono pre-amp
The output amplifier would make a good headphone amp.
I plan on using PSPICE to sim these circuits just to learn from them. Maybe make them on day!!
I have used HP 333,339,8903, I still like the Amber!!

Rick
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Old 14th September 2012, 11:33 PM   #379
dimitri is offline dimitri  United States
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Quote:
I still like the Amber!!
Rick, please think twice. Four-gang potentiometer is a real PITA. They put consumer type and there is no way to replace it I still have the unit
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Old 14th September 2012, 11:52 PM   #380
rsavas is offline rsavas  Canada
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Yes I missed that, V2015(20K), 2 gangs on the osc & 2 on the notch filter, oh, well, still using a two gang pot for an oscillator only design is do able, don't you think? After all that is what this discussion is about, not making a distortion analyzer set.

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