Low-distortion Audio-range Oscillator

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#5,701
1audio said:
I did not start the thread on a PCB for Victor's oscillator. Its starts here: http://www.diyaudio.com/forums/equi...-victors-low-thd-oscillators.html#post4164497 I need to open mine to see how i kludged it. Essentially i bypassed the two 100 Ohm resistors. The Lm317 + no resistors maximized battery life. important for 9V batteries which aren't cheap. I bought a pile from China via eBay. Years ago I visited the China factory making them (Only one then, probably still). They had every known brand on display since they made something like 80% of the world's 9V batteries. No good reason to buy premium batteries for this application.

I still get a significant improvement in noises using battery power. I have tried low noise linear and switching supplies but the power line to ground leakage is limiting performance.
Click to expand...

Demian, have you tried a SilentSwitcher on a mains-free PowerBank? Did I send you one? Or would 30V total be insufficient?

Jan
 
#5,703
well, i have started to tackle the IPS/protection for the AP-2277A. Good luck to me. Thx me.

The group of 4 transistors are the protection fets... DS2435 on the input to the two (Bal) IPS pcb.


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THx-RNMarsh
 
#5,705
jan.didden said:
Demian, have you tried a SilentSwitcher on a mains-free PowerBank? Did I send you one? Or would 30V total be insufficient?

Jan
Click to expand...

I have it and will try it. My shop is in the low 50's F and no heat so I'm just not going there right now. I would really like a variant that has several 36V floating outputs, perhaps not even regulated, for applications like this.

I'm surprised or chna resource have not made something like it for that application. All I have found on eBay are non-isolated supplies. Ideal today might be a 5V in (to run off a generic USB charger) to floating 36V which can be locally regulated to run a typical load. There is one I found from Power One but its expensive and doesn't have that much power.
 
#5,709
Its listed as 55 mA/Hr and the Victor board with a CCS needs about 18 mA to operate Doing the arithmetic they will give you about 3 hours operation. Following these graphs http://www.alliedelec.com/m/d/bb267eb6105f9f310e61977288b88924.pdf you should be able to get about 15 hours. Even though the 9V is more money the 5X difference in life still makes it the first choice. Shame since clips for those 12V batteries look much easier to deal with. I hate the snaps.
 
#5,712
Personally, I use the gel cells... they are large and bulky and not cheap but last forever and rechargable... i just use my car trickle-charger on them... works fine every time.

When will Vic make a finish package osc? case, battery or supply etc. I still use the pcb circuit without a box for it and lash something together every time i want to use it.

meanwhile, i got the leaky ips protection fets replaced in one channel of the AP 2722 analyzer. Waiting for more parts on the other channel. Checking the internal gen now shows it is pretty decent to say the least.

AP Gen.JPG



THx-RNMarsh
 
#5,713
1audio said:
I have it and will try it. My shop is in the low 50's F and no heat so I'm just not going there right now.
Click to expand...

Here that would be the point we would consider putting on long sleeve shirts 😀

1audio said:
I'm surprised or chna resource have not made something like it for that application. All I have found on eBay are non-isolated supplies. Ideal today might be a 5V in (to run off a generic USB charger) to floating 36V which can be locally regulated to run a typical load. There is one I found from Power One but its expensive and doesn't have that much power.
Click to expand...

Most things that run off a USB charger (incl. the SilentSwitcher) also run fine from a 3.7V LiPo battery and then are fully floating. A single LiPo is much more friendly than a bank of large gel or other batteries.
A PowerBank is basically a LiPo with an internal boost converter anyway.

Jan
 
#5,714
RNMarsh,

I don't know if it's my browser that doesn't work properly on DiyA, but when people add pictures directly inside the post instead of using the attachment function, and when clicking on the picture it takes me to another page and it's frustrating going through many pictures forth and back.

Would it be possible to add pictures instead as an attachment (Scroll down a bit below the comment text box and look for the "Additional Options" and the "Manage Attachment" button), it has some benefits:

1. The picture zoom in and out with one single mouse click without taking one to another web page.
2. The picture is possible to drag around when holding down left-mouse-button which is good when we want to zoom in large pictures, but also drag it a bit aside so one can view the post and correlate post with the picture.
3. It's possible to zoom in several pictures at once so one can verify them side by side, useful with measurements where details and differences are small.

EDIT: one more...
4. Using the Attachment functions allows also to upload a picture onto here from other web pages, in many cases people add only a link in the post and unfortunately I have already come across several dead links which some times render the post completely useless because one can't view the picture.

Thanks for the consensus.TOP
 
Last edited:
#5,715
RNMarsh said:
Personally, I use the gel cells... they are large and bulky and not cheap but last forever and rechargable... i just use my car trickle-charger on them... works fine every time.

When will Vic make a finish package osc? case, battery or supply etc. I still use the pcb circuit without a box for it and lash something together every time i want to use it.

meanwhile, i got the leaky ips protection fets replaced in one channel of the AP 2722 analyzer. Waiting for more parts on the other channel. Checking the internal gen now shows it is pretty decent to say the least.

View attachment 590430



THx-RNMarsh
Click to expand...

That's better.

Nice work.
 
#5,717
maiko said:
RNMarsh,

I don't know if it's my browser that doesn't work properly on DiyA, but when people add pictures directly inside the post instead of using the attachment function, and when clicking on the picture it takes me to another page and it's frustrating going through many pictures forth and back.

Would it be possible to add pictures instead as an attachment (Scroll down a bit below the comment text box and look for the "Additional Options" and the "Manage Attachment" button), it has some benefits:

1. The picture zoom in and out with one single mouse click without taking one to another web page.
2. The picture is possible to drag around when holding down left-mouse-button which is good when we want to zoom in large pictures, but also drag it a bit aside so one can view the post and correlate post with the picture.
3. It's possible to zoom in several pictures at once so one can verify them side by side, useful with measurements where details and differences are small.

EDIT: one more...
4. Using the Attachment functions allows also to upload a picture onto here from other web pages, in many cases people add only a link in the post and unfortunately I have already come across several dead links which some times render the post completely useless because one can't view the picture.

Thanks for the consensus.TOP
Click to expand...

It is annoying but you might be able to adjust your browser so they don't open on another tab.
 
#5,718
RNMarsh said:
meanwhile, i got the leaky ips protection fets replaced in one channel of the AP 2722 analyzer. Waiting for more parts on the other channel. Checking the internal gen now shows it is pretty decent to say the least.
Click to expand...

Congratulations - the sterling performance of your 2722 finally returns! Here's the FFT of a 1Vrms 1kHz after an "extreme" notch treatment on the UPV. The signal was routed from the generator to the analyzer externally through a RG316 cable to simulate connection to a DUT and reveal any possible EMF/RFI weaknesses in the chain, With H2 and H3 both around -151dB, it looks OK to me.
 

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#5,719
ci11 said:
Congratulations - the sterling performance of your 2722 finally returns! Here's the FFT of a 1Vrms 1kHz after an "extreme" notch treatment on the UPV. The signal was routed from the generator to the analyzer externally through a RG316 cable to simulate connection to a DUT and reveal any possible EMF/RFI weaknesses in the chain, With H2 and H3 both around -151dB, it looks OK to me.
Click to expand...

You have nice toys.
 
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