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Old 22nd May 2013, 06:10 AM   #6031
Ceglar is offline Ceglar  Australia
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Thanks again, seems thats my way forward on this.
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Old 27th May 2013, 11:45 AM   #6032
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Originally Posted by Salas View Post
Hi Kazuo

Better set the probe at 1X and turn the Tek TDS scope's 20MHZ bandwidth limit "ON".
I measured again.
Probe is set at 1X. You can read other conditions from photos
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Old 27th May 2013, 06:26 PM   #6033
Salas is online now Salas  Greece
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Hello Kazuo

Thanks for the captures. They look appropriately tame and quiet. Do you manually run the base line at one graticule above the centre for clarity, or it jumps there by itself?
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Old 29th May 2013, 01:45 PM   #6034
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Quote:
Originally Posted by Salas View Post
Hello Kazuo

Thanks for the captures. They look appropriately tame and quiet. Do you manually run the base line at one graticule above the centre for clarity, or it jumps there by itself?
Your eyes do not miss any small things
I purchased TDS350 that was secondhand and no maintenance at bargain price. I guess it needs adjustment. This may be the reason of not matching base line.

I have downloaded the manual and reading how to adjust.
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Old 29th May 2013, 09:59 PM   #6035
Salas is online now Salas  Greece
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It would be nice if it can run a self cal routine as all the more recent DSOs.
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Old 31st May 2013, 06:40 PM   #6036
stajo is offline stajo  Sweden
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It can and it has a probe cali hook
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Old 2nd June 2013, 12:29 PM   #6037
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Quote:
Originally Posted by Salas View Post
It would be nice if it can run a self cal routine as all the more recent DSOs.
Thanks all.
After running self test mode, TDS350 was adjusted correctly
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Old 3rd June 2013, 12:42 PM   #6038
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Default Reflektor Advanced

On post #5934 Mr. Canvas let me notice that Cxxx of M3 NMOSFET is important factor. I guess lower the Cxxx better the sound. However Cxxx of NOSFET is relatively big. Therefore I decided to look for a higher-performance device for NMOSFET.

Now I have replaced NMOSFET with RF diode. I got MA2S077 which Cd is 0.9pF (typ). Unfortunately it is discontinued. But you can find the substitution easily. Measuring serial resistance (Rs), it shows approx 2 ohm/each on 10mA DC. The Rs tends to become lower over high band frequency.

The sound is more open, transparency and soulful, obtained a big improvement IMO.

I think that Reflektor is affected greatly by two factors at least.
1) The quality of C1
2) The quality of R5

If you use lower quality one you would feel dissatisfaction by all means and could not know the true talent of Reflektor. As long as I used some film caps for C1 and/or winding wire resistor for R5, I was not able to obtain a good result. I recommend that Teflon or Mica for C1 and Vishay VAR for R5.

Next I will study how the quality C3 affects the sound.

best regard
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Old 3rd June 2013, 01:16 PM   #6039
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which Is best to use as a reference - led string only, led string with small resistor, zener
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Old 3rd June 2013, 02:55 PM   #6040
Salas is online now Salas  Greece
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Kazuo, did you ever try IR LEDS I had talked about as Vref?
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