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Old 14th July 2019, 10:25 AM   #891
delange is offline delange  Belgium
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Quote:
Originally Posted by meanman1964 View Post
Try audiophonics.fr
I know them but they don't have any decent ones.
A couple of years ago I bought some from Hoyt. This is a company based in the US. They have good VU meters; they even have calibrated ones. But I would like meters where I can customize the back panel.

I know, I'm a difficult guy... :-)
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Old 14th July 2019, 11:15 AM   #892
nanakos is offline nanakos  Greece
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Wskaźnik Nissei [P-134NO] - Sklep modushop.pl

I bought these.
Very nice and huge but do not have their own lighting.
I put COB LED Panel Lamp with a resistor
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Old 14th July 2019, 11:23 AM   #893
nanakos is offline nanakos  Greece
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Default V4H

measurements...
Frequency response 1hz-50khz
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Old 14th July 2019, 11:27 AM   #894
shaan is offline shaan  India
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Nice and flat.

What scope are you using?
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Old 14th July 2019, 11:28 AM   #895
nanakos is offline nanakos  Greece
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I'm using a Picoscope
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Old 14th July 2019, 01:49 PM   #896
delange is offline delange  Belgium
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Quote:
Originally Posted by nanakos View Post
Wskaźnik Nissei [P-134NO] - Sklep modushop.pl

I bought these.
Very nice and huge but do not have their own lighting.
I put COB LED Panel Lamp with a resistor
Nice! Thanks for sharing.

Do you know if it is possible to open them? I would like to remove the black inlay and use a white background (with black lettering).
I prefer my audio gear in silver color :-)
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Old 14th July 2019, 02:40 PM   #897
nanakos is offline nanakos  Greece
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Yes is very simple to open.
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Old 15th July 2019, 06:45 PM   #898
delange is offline delange  Belgium
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Quote:
Originally Posted by shaan View Post
Hello guys.

A preamp/headphone amp is undergoing development. Here is the thing on perfboard and some preliminary test results. Bias 20mA. Power supply is unrregulated half-wave rectified +/-17V.

Let me know your thoughts.

More coming soon.
Your measurements seem a bit odd: the source measurement has a bit worse (very tiny bit, but still) noise floor than the DUT. Also, the DUT has slightly less distortion than the source.

I have no need myself for an headphone amplifier or analog preamp but I'm curious to see what you are up to :-)
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Old 15th July 2019, 07:09 PM   #899
shaan is offline shaan  India
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Quote:
Originally Posted by delange View Post
Your measurements seem a bit odd: the source measurement has a bit worse (very tiny bit, but still) noise floor than the DUT. Also, the DUT has slightly less distortion than the source.
That's because source snap has a 137dB range while pre-out snap has 140dB. My mistake.

Noise floor is at same distance from 0dB in both cases, but the smaller range setting makes source out to have a higher noise.

Lower apparent harmonic level in pre out can be due to phase difference between the same harmonics from source and pre-out Scheduled for check how much off phase the individual pre harmonics are relative to source harmonics.

Quote:
I have no need myself for an headphone amplifier or analog preamp but I'm curious to see what you are up to :-)
Thanks. I'm trying to add some fun and flexibility to the pre. As with the amps, it will have trimmer(s) for setting certain aspects of its behavior.
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Old 17th July 2019, 03:51 AM   #900
tcpip is offline tcpip  India
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Hi Shaan,

Do you have any v4Hr1 boards left? Also, any other associated boards like PSU boards?
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