Selecting a turntable amp design to build as a gift. (Advanced DIY'er)

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Copper Dog

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Joined 2012
#1
Hi all;

I'm a long time member but don't spend a lot of time on this particular forum since I tend to be involved in control stuff rather than audio circuitry.

My son has recently gotten into turntables however and I'd like to build the best turntable amp I can as a gift. I can layout, etch and solder any double sided board down to SMD 805 (and smaller) however I have very limited experience in building audio systems let alone designing.

I'm asking for some help in selecting a proven circuit and board designed specifically for turntables.

A scratch build would be the coolest I think however I would also consider a kit.

Any suggestions are welcome
 
#2
Oh boy...now I feel dumb. A what or a what? Off to Google and I realize you're asking about the cartridge he's using on the turntable. This is a gift so I can't ask him to much about the table or the gig will be up (he's well aware of my hobby) but I do know its a Teac model which I believe has an MM cartridge.
 
#3
I've been looking at the specs for his unit today and it has a pre-amp built in with the following specs.

Phono Equalizer Amplifier
Type of Amplifier MM type (On/Thru switchable)

Analog Output
Connector RCA Pin jack (Gold-plated)
Output Voltage Phono/Line switchable
Phono Output 4.5mV +/–3dB
Line Output 120mV (–13dBV)

USB Output section
Connector USB B type
Output Signal PCM 48kHz/16-bit

I suppose any amp I build will need volume control if he wants to hook directly to speakers. The Amp Camp kit doesn't appear to have that.
 
#5
Hmm, lots going on at that site. The SA-C22 is a pre-amp. The turntable has a pre-amp built in however it lists the output voltage as Phono/Line Switchable (man I know nothing about this stuff) which means it can be bypassed?

Looking at the Teac manual and yes the pre-amp can be bypassed to get the cart signal directly. (See what I did there? I'll catch on to the audio lingo. Believe me, I'm better at micro controllers.)
 
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#6
Copper Dog said:
I suppose any amp I build will need volume control if he wants to hook directly
to speakers. The Amp Camp kit doesn't appear to have that.
Click to expand...

Yes, he would use the turntable's phono output into the external phono preamp,
if you build one.

Either the external phono preamp could have a volume control built inside, or else
you can easily add a volume control to any power amplifier. There are also many
integrated amplifiers with a volume control, but without a phono stage.
 
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#7
Copper Dog said:
Hmm, lots going on at that site. The SA-C22 is a pre-amp. The turntable has a pre-amp built in however it lists the output voltage as Phono/Line Switchable (man I know nothing about this stuff) which means it can be bypassed?
Click to expand...
Sorry...i didn't know that the turntable allready has it's own preamp. Most probably...yes.If it has a line output, than you can buy any amplifier with a line input.The aiwa is a hell of a good preamp though.Really high quality for the money.I did too many mods in it , mostly out of my own curiosity, but in the end i found that the only thing that i should have done to that was to remove the 4066 cmos switchers and select only the phono output with a wire strap...lt1115 and higher supply voltage can only be beneficial to that design. I just wanted to see if a transimpedance fet input can be better and it wasn't.I used two of the best turntables and v15type 3 shure mm cart among others on dual 701 , dual 1219 and one other dd.
 
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