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The Phonoclone and VSPS PCB Help Desk
The Phonoclone and VSPS PCB Help Desk
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Old 23rd May 2020, 02:22 PM   #4301
evonimos is offline evonimos
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If anyone is interested I can prepare a recording and share it.
It will give you an idea of what this little kit is capable.

If you've got any particular song in mind say so.
Might use a common cartridge like an AT VM95C, an AT3600L etc, that many people are familiar with.
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Old 3rd June 2020, 10:37 PM   #4302
woodturner-fran is offline woodturner-fran  Ireland
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Richard,

I have an old VSPS set that I have a hankering to trick about with a power supply for. Will +/- 10v to the opamp do the trick?
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Old 7th June 2020, 09:20 AM   #4303
mickhick1 is offline mickhick1  England
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Hi Richard,
I have a Phonoclone 3 rev 35h and was wondering if it is possible to bring it up to the latest Phonoclone 4 stage or would that need a different board? I particularly note your comments on a much earlier post about the X reg vs S reg.
Sorry if this has been discussed before.
Mike
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Old 8th June 2020, 06:44 AM   #4304
rjm is offline rjm  Japan
Richard Murdey
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@woodturner-fran

Well well, that's someone I haven't from in a while! Hi Fran, how are you doing?

Op amps in the VSPS will do just fine on anything from 8-15 V rails, 9-12 V being ideal.

@mickhick1

Yes, new board and a small difference in mounting holes I'm afraid. You can re-use the op amps and the output coupling caps. It's not quite a drop-in replacement, but rather a couple of 3mm drill holes away from it.


Richard
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Old 15th June 2020, 11:19 PM   #4305
woodturner-fran is offline woodturner-fran  Ireland
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Quote:
Originally Posted by rjm View Post
@woodturner-fran

Well well, that's someone I haven't from in a while! Hi Fran, how are you doing?

Op amps in the VSPS will do just fine on anything from 8-15 V rails, 9-12 V being ideal.



Richard
Thanks!! Life is good, away from DIY audio for a while but doing some tidying up in pandemic times!

Hope you are doing well too!!
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Old 17th June 2020, 10:54 AM   #4306
fap is offline fap  Australia
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G'day all, just a question without notice. Years ago I did build a basic VSPS and rather liked it, but the rising frequency response above 20 khz rather unnerved me! Is there a way to add simple filter on the output to roll off the response and maintain close adherence to the spirit of the original RIAA phono playback specification? Regards, Felix.

Last edited by fap; 17th June 2020 at 10:55 AM. Reason: Spelling.
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Old 18th June 2020, 01:15 AM   #4307
rjm is offline rjm  Japan
Richard Murdey
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Quote:
Originally Posted by fap View Post
...the rising frequency response above 20 khz rather unnerved me! Is there a way to add simple filter on the output to roll off the response and maintain close adherence to the spirit of the original RIAA phono playback specification?
First off, the frequency response of the VSPS doesn't rise at high frequency. It just stops falling. Normalized to the RIAA response however, it actual HF response exceeds the RIAA standard, so the response plot ticks upwards.

Several years back I revised the VSPS circuit to remove the "Allen Wright" 50 kHz time constant responsible for this leveling out of the HF response. The response is now flat to 20 kHz.

If you want to quick-and-dirty mod your VSPS, just short over (or replace with a wire) the resistor which is in series with C1. I think it was labelled R3 in the original version, and was nominally 2.2 kohms. If you want to go all the way to revise your VSPS to the current version, change the 105kohm resistor to 110k, and the 732kohm resistor to 768k.
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File Type: png VSPS-response.png (21.3 KB, 93 views)
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Old 18th June 2020, 03:01 AM   #4308
rjm is offline rjm  Japan
Richard Murdey
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Update Jun 18th re. postal delivery

Finally, most major countries in Europe are back to normal service.

Parcels to United States is still suspended.


https://www.post.japanpost.jp/int/in...8_01_01_en.pdf
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Old 18th June 2020, 10:28 AM   #4309
fap is offline fap  Australia
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G'day mate, thank you. Regards, Felix.
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Old 21st June 2020, 01:21 AM   #4310
rjm is offline rjm  Japan
Richard Murdey
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SERVICE ADVISORY
June 21th 2020

VSPS KIT

The last four VSPS Kits to be shipped out were sent with 100 ohms for R6/R6L instead of 100 kohms.

I'm pretty sure they are still in transit or just arrived. Andy got his and kindly notified me of the mistake. Thure, Jaap, and Michel are probably still in the post. I will be in email contact shortly.

Apologies for the screw-up

Richard
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