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Old 17th March 2004, 02:11 PM   #1
kmj is offline kmj  Sweden
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Default Easy DIY RIAA-preamp wanted.

Hi, I am in need of a preamp for my old turnable.

It seems that the guys at HK neglected to put a phonoamp in my reciever......

so instead of buying one i thought that i perhaps could start up a new hobby and build one myself. But since there are so many schematics out there i thought that you guys could recommend one thats quite easy to build and with complete schematics for powersupply and amp-stage....

anyone got any suggestions?

imput sencitivity and impedance of the existing amp is 200mV and 47kOhm
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Old 17th March 2004, 03:18 PM   #2
Keld is offline Keld  Sweden
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Default Re: Easy DIY RIAA-preamp wanted.

Quote:
Originally posted by kmj
recommend one thats quite easy to build and with complete schematics for powersupply and amp-stage....

anyone got any suggestions?

http://www.hagtech.com/bugle.html
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Old 17th March 2004, 03:28 PM   #3
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national has an RIAA phono amp based upon the LM833 chip on their website -- look it up on the LM833 product descriptor.

i was quite pleased with the results (but you could use a quieter chip if you so desire.) i looked for the PCB layout on my drive, but must have erased it.
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Old 17th March 2004, 03:37 PM   #4
kmj is offline kmj  Sweden
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thanks, but there was only the partial schematic.....

im not looking to buy a kit, only the parts and solder them together and put it all in a chassi (to make short summation )

much cheaper that way, and a kit feels like cheating......
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Old 17th March 2004, 03:38 PM   #5
kmj is offline kmj  Sweden
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national???
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Old 17th March 2004, 03:55 PM   #6
coffin is offline coffin  Taiwan
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http://www.national.com/pf/LM/LM833.html#Datasheet

and this:

Check Out MY El Cheapo Phono Preamp!
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Old 17th March 2004, 04:17 PM   #7
kmj is offline kmj  Sweden
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thank you, coffin.

The el cheapo seems to be what im looking for.

could a PCB transformer be used instead of a torrodial?

how would a powersupply look in that case?
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Old 17th March 2004, 07:06 PM   #8
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Quote:
Originally posted by kmj
thank you, coffin.

The el cheapo seems to be what im looking for.

could a PCB transformer be used instead of a torrodial?

how would a powersupply look in that case?
I use a small PCB transformer -- be careful to keep the a.c. line inputs away from the phono inputs. for the power supply I use a pair of LM317's and a pair of LM337's -- for the + and - rails.
the first regulator is set to 19 volts, the second to 15 volts -- the two regulators in series seem to prevent "turn-on" thump.
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Old 17th March 2004, 07:37 PM   #9
kmj is offline kmj  Sweden
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A friend of mine used this as a 15V supply....

with these:
U1,2: http://www.elfa.se/elfa/produkter/se/2021125.htm

trafo sec 2x15V: http://www.elfa.se/elfa/produkter/se/2014310.htm

could i use that and make it 2x12V instead using this:
http://www.elfa.se/elfa/produkter/se/7026.htm


just push the little brittish flag to change language on ELFA
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Old 17th March 2004, 10:13 PM   #10
Keld is offline Keld  Sweden
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Quote:
Originally posted by kmj
thanks, but there was only the partial schematic.....

The hole schematic is in the "User manual"
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