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low Distortion Oscillator GS 5534-8 (NE5534)
low Distortion Oscillator GS 5534-8 (NE5534)
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Old 24th September 2017, 01:46 PM   #1
SandyTodorov1 is offline SandyTodorov1  Bulgaria
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Default low Distortion Oscillator GS 5534-8 (NE5534)

THD Out=5Vmax 10Vpp F=1.6KHz
------------------------------------------
Output ---- 0° - 0,000 004%
Output -- 90° - 0,000 011%
Output - 180° - 0,000 022%
Output - 270° - 0,000 011%
Attached Images
File Type: png GS 5534-8 Sch.PNG (148.7 KB, 1138 views)
File Type: png GS 5534-8 Pcb.PNG (360.5 KB, 1081 views)
File Type: png Sin-5534 Photo-8 3D.PNG (567.4 KB, 1036 views)
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Old 24th September 2017, 06:16 PM   #2
RNMarsh is offline RNMarsh  Thailand
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Looks like you accepted the idea of filtered harmonics on the generator output to good use. Now we need a THD or FFT measurement to back up those SIM numbers.


THx-RNMarsh
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Old 24th September 2017, 10:49 PM   #3
SandyTodorov1 is offline SandyTodorov1  Bulgaria
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Quote:
Originally Posted by RNMarsh View Post
Looks like you accepted the idea of filtered harmonics on the generator output to good use. Now we need a THD or FFT measurement to back up those SIM numbers.


THx-RNMarsh
There are no filters.
Attached Images
File Type: png GS 5534 RC Sch.PNG (105.2 KB, 1022 views)
File Type: png GS 5534 RC Pcb.PNG (214.6 KB, 972 views)
File Type: png GS 5534 Out Sch.PNG (138.8 KB, 281 views)
File Type: png GS 5534 Out Pcb.PNG (221.9 KB, 275 views)
File Type: png GS 5534 3D.PNG (446.8 KB, 154 views)
File Type: png GS 5534-8.PNG (90.1 KB, 200 views)
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Old 25th September 2017, 12:25 AM   #4
SandyTodorov1 is offline SandyTodorov1  Bulgaria
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THD=0.051/10000----0.000 0051% -146db
Attached Images
File Type: png Measurement.PNG (60.9 KB, 335 views)
File Type: png THD.PNG (63.0 KB, 347 views)
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Old 25th September 2017, 12:56 AM   #5
SandyTodorov1 is offline SandyTodorov1  Bulgaria
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Discrete OP-1005 for Measurement
Attached Images
File Type: png OP-1005 THD.PNG (30.2 KB, 331 views)
File Type: png OP-1005.PNG (485.3 KB, 319 views)
File Type: png OP-1005 Buttom.PNG (241.4 KB, 262 views)
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Old 25th September 2017, 06:38 PM   #6
RNMarsh is offline RNMarsh  Thailand
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Yes, correct... seeing the osc with C fb serves dual roll, though.

looks impressive..... are you going to made some to sell?

I don't do smd hand soldering.


THx-RNMarsh
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Old 25th September 2017, 11:22 PM   #7
DNi is offline DNi  Switzerland
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Quote:
Originally Posted by SandyTodorov1 View Post
THD=0.051/10000----0.000 0051% -146db
If I'm interpreting your spectra correctly, the upper one comes from the channel without the notch filter and the post filter amplification. If this is so, what is the reason for dividing the THD of 0.051% by 10000, i.e. lowering it by 80dB?


Regards,
Braca
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Old 27th September 2017, 09:01 PM   #8
Elvee is online now Elvee  Belgium
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I like the circuit, in particular the zero-ripple AGC and its Fet active linearization, but I don't see how it is possible to reach a THD level of 40ppb with these opamps.
Sure, the NE5534's are good and trustworthy workhorses, but their native THD level is at least 10 to 100 times worse than that, and I see no tricks that could overturn that, unlike the one used in the output circuit (and I doubt that this compensation trick alone could suffice anyway).

So, what's the secret?
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Old 1st October 2017, 04:32 PM   #9
SandyTodorov1 is offline SandyTodorov1  Bulgaria
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Quote:
Originally Posted by DNi View Post
If I'm interpreting your spectra correctly, the upper one comes from the channel without the notch filter and the post filter amplification. If this is so, what is the reason for dividing the THD of 0.051% by 10000, i.e. lowering it by 80dB?


Regards,
Braca
Top channel "L" with Firtra (0.051%)
Bottom channel "R" (0.0034%) Direct to see the THD of the sound card that are low enough compared to the measured.
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Old 1st October 2017, 07:04 PM   #10
SandyTodorov1 is offline SandyTodorov1  Bulgaria
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The generator does not use the frequency correction C24, C26, S31 is not needed.

Correct measurement of THD for NE5534.
THD = 0.000 015 Rt=3к Ku=-1 Uout=5Vrms
THD = 0.000 240 Rt=1к Ku=-1 Uout=5Vrms


Correct measurement of THD for LT1115
THD = 0.000 008 Rt=3к Ku=-1 Uout=5Vrms
(As an integrator generates)!!


Correct measurement of THD for Diskreje OP1005
THD = 0.000 8 Rt=3к Rt=1k Ku=+1000 Uout=5Vrms
Equivalent to
THD = 0.000 000 8 Rt=3к Rt=1k Ku=1 Uout=5Vrms


Without it, measuring the above amplifiers cannot be done correctly.


Correct measurement of THD for NE5534.
THD = 0.000 13 Rt=5к Ku=-100 Uout=5Vrms
THD = 0.001 30 Rt=1к Ku=-100 Uout=5Vrms


Correct measurement of THD for NE5532.
THD = 0.000 4 Rt=5к Ku=-100 Uout=5Vrms
THD = 0.004 0 Rt=1к Ku=-100 Uout=5Vrms
Attached Images
File Type: png 5534 Test.PNG (97.7 KB, 279 views)
File Type: png 5534 THD Ku=-1.png (61.6 KB, 280 views)
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