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Old 17th November 2008, 09:09 PM   #1
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Default adjustable riaa amp?

hi guys

after a bit of help, im looking for a phono stage schematic (or board) with a modified RIAA curve (ie more bass) or adjustable turnover /rolloff found a schematic a while ago but just cant seem to track it down now..

i can assemble boards from diagrams but cant design anything

its just for playing standard RIAA records, just im not happy with the overall "sound" of every phono stage ive tried, so id like something adjustable, or something that deviates from the riaa curve

thanks!
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Old 18th November 2008, 02:33 AM   #2
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How about just using a tone control ( parametric equaliser or just multi band equaliser ? ) after the phono stage .

A good phono stage should sound good and not require any alterations to it's turn over frequencies if :

1. The phono preamp itself is good
2. The cartridge is good ( including the stylus !)
3. The tone arm is good
4. The turntable mat is good
5. The turntable itself is good
6. The turntable chassis is well isolated
7. The coupling RCA cable set is good
8. The power amp is good and
9. The speakers are good AND
10. A well cut vinyl album is used !

That gives you a whole range of areas to work on to improve what you hear.
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Old 18th November 2008, 04:09 AM   #3
lineup is offline lineup  Sweden
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Default Bass Boost, with 4 booster options

Bass Booster
to be used to attach AFTER the phono RIAA.

You have a rotary switch ( use 4 postions of one 6 pole )

- Pos 5 = Flat +12dB gain, Green curve
- Pos 4 = High Bass boost, Red Curve
- Pos 3 = Low Bass boost, Purple curve
- Pos 2 = Flat 0dB, Blue curve

My own fresh custom designed schematic, comes in next post.
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File Type: png bassbooster_1a_curves.png (7.7 KB, 149 views)
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Old 18th November 2008, 04:11 AM   #4
lineup is offline lineup  Sweden
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Power supply can be two 9 Volt Battery
or 2 x 12 VDC IC regulated
LM7812 and LM7912, for example

Enjoy
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File Type: png bassbooster_1a.png (5.6 KB, 178 views)
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Old 18th November 2008, 10:24 PM   #5
lineup is offline lineup  Sweden
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Default Re: adjustable riaa amp?

Quote:
Originally posted by lensmanMk2
... modified RIAA curve (ie more bass) ...
...id like something adjustable, or something that deviates from the riaa curve
if you need more than +12 dB bass boost
of course I can try do circuit for this, too
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Old 19th November 2008, 06:13 PM   #6
Segran is offline Segran  Sweden
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Default RIAA with bass boost

Her's a couple of links describing a really good RIAA pre-amp with a selectable slight boost of the bass. I use it myself since a few months and it makes all the difference in listening to vinyl! Unfortunately all the doc is ion swedish, since it was developed and published by LTS, the Swedish Sound Association.

The schematics:
http://user.faktiskt.se/naqref/LTS_riaa/riadia.pdf
It's C5 that you short circuit to gain a couple of dB more bass.

Partslist:
http://www.naqref.com/pdf/Komponentl...TS-RIAA_07.pdf
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Old 20th November 2008, 03:55 AM   #7
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Quote:
The schematics:
http://user.faktiskt.se/naqref/LTS_riaa/riadia.pdf
It's C5 that you short circuit to gain a couple of dB more bass.
This link doesn't work (Forbidden) ?
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Old 20th November 2008, 04:03 AM   #8
lineup is offline lineup  Sweden
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try this
it works!!!!!!!!!!!!!!!
http://user.faktiskt.se/naqref/LTS_riaa/

always is funny to be allowed to peak into other's peoples folders
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Old 20th November 2008, 04:05 AM   #9
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Still got;
You don't have permission to access /naqref/LTS_riaa/ on this server.
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