2N4091 DATASHEET PDF

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Originally Posted by Bob Cordell. Hi Alex, This is good information. It is odd, however, that adjusting the oscillator agc to obtain a higher operating signal level in the oscillator does not increase distortion, including any that would be introduced by the agc FET.

I know the 2N is no longer available, and that is problematic. Its high Vgs off is important to minimize its distortion contribution, as the operating signal is then small compared to Vgs. I'm surprized that there are not any good substitutes out there. Of course, we cannot fully rule out that there is some other source of distortion, such as bad op amps or op amps that are oscillating.

What op amps are you using? Maybe try another, like the LM, that is internally compensated for unity gain. It is entirely possible to replace the JFET agc with a good low-noise analog multiplier with some good engineering. Best, Bob. Attached Files Cordell Oscillator Residual. Find More Posts by Samuel Groner. Originally Posted by Samuel Groner.

Probably low enough to not give a drastic increase in distortion, but as the part is more difficult to source than the other two replacements I'd avoid it. I would not believe that too much. Attached Files Silconix AN Well, I have studied this subject here and read the article series a few times, to really understand the design.

I simulated the oscillator in LT-spice. Well, I found the models, but the simulator ran smoother with LT Anyway, I confiugered the oscillator to run in 1kHz mode. Bob recommended a four phase rectifier, I set out to test this. I measured the ripple voltage at the output of IC7 and found it to be 1. I reran the test with a four phase rectifier and found the ripple to be 0.

Changing C10 to 1uF reduces the ripple to uVpp. Anybody that has identified the regulation parameters of the system, to get an optimized amplitude regulation in the oscillator?

Thanks for informing me of the LT amplifier, I didn't intend to really use it, but I needed something to simulate the system with, to learn the circuit. The Audio Precision System One service manual is also required reading.

There are many more references which cover oscillator amplitude stability but you need a good local library or IEEE access as these ain't on the web.

Thanks for the litterature reference. I will keep on studying. The reference was really good reading, it gave me a somewhat theoretical explanation to my "experimental" findings in LT-spice, where the amplitude got an exponential growth or decay exp kt as a step response. I still haven't got to the control equation. But I have some ideas, it's usually only once a year that I do control theory calculations. I promise to get back with the calculations, as soon as I have something to present.

Hi again, Some more questions. The oscillator, is it still the state variable oscillator that still is the best audio oscillator. DPDT are the cheepest relays, and they can control both integrators.

But there is the reliability issue. I will try to look for a good library to read about the oscillators. BB code is On. Smilies are On. Forum Rules. All times are GMT. The time now is PM. Resources saved on this page: MySQL My implementation of the Cordell Distortion Analyser.

User Name. Stay logged in? Mark Forums Read. Solid State Talk all about solid state amplification. Please consider donating to help us continue to serve you. Page 18 of Thread Tools. Cordell Oscillator Residual. View Public Profile. Send a private message to kcollins. Find More Posts by kcollins. The specs are right on. The device is specifically intended for this type of application and is supposed to be more linear.

Send a private message to Samuel Groner. Visit Samuel Groner's homepage! Silconix AN In any event, the device does indeed work well in this particular case, as, I believe, my results demonstrate. I have not tried this, it looks like it might have merit for applications such as this. Send a private message to magnu. Find More Posts by magnu. Quote: The simulator ran smoother with LT Posting Rules. Similar Threads. HPA Distortion Analyser.

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Originally Posted by Bob Cordell. Hi Alex, This is good information. It is odd, however, that adjusting the oscillator agc to obtain a higher operating signal level in the oscillator does not increase distortion, including any that would be introduced by the agc FET. I know the 2N is no longer available, and that is problematic. Its high Vgs off is important to minimize its distortion contribution, as the operating signal is then small compared to Vgs. I'm surprized that there are not any good substitutes out there. Of course, we cannot fully rule out that there is some other source of distortion, such as bad op amps or op amps that are oscillating.

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