Diamond buffer

pdul · 4th February 2012, 08:21 PM

Hi !
I just bought a board for this on Ebay.
Anybody have some experience or comments for this circuit?
Is it any good as a linestage in a preamp?
How does it sound?
Any take on component values before I start soldering?
Any input will be wellcome.
The pws is onboard standard LM317/337 setup

pdul · 4th February 2012, 08:23 PM

sorry i forgot

jaycee · 4th February 2012, 09:48 PM

I use a similar circuit as a headphone amp - in mine the 3K9 resistors are active current sources. It sounds pretty good to me.

I scaled mine up a bit - the output devices are MJE15032/3, because I run it with enough bias current that it is class A for 32 ohm loads. Try your kit, it'll sound nice

pdul · 4th February 2012, 10:08 PM

What opamp do you use?

pdul · 4th February 2012, 10:12 PM

My plan is to use LME 49720

dirkwright · 4th February 2012, 10:14 PM

Quote:

Originally Posted by pdul

My plan is to use LME 49720

Good choice! I did the same. I have two of these boards from Jim's Audio. I built one but have not listened to it. I ran some square waves through it and they looked good. I matched the output transistors as well.

jaycee · 4th February 2012, 10:24 PM

I used OPA2134 because i had them

pdul · 4th February 2012, 10:34 PM

Do you use A970/C2240 and A1145/C2705 as shown in the schematic?

pdul · 4th February 2012, 10:44 PM

Will 10 times amplification be suitable for a linestage ?

jaycee · 4th February 2012, 10:50 PM

No, BC550/BC560, and MJE15032/3 for the outputs. How much gain you'll need depends on your source. I found that for a 2V RMS input, no gain was needed.

Bear in mind that headphones are typically quite sensitive and it doesn't take much output power to blow your head off!

4th February 2012, 08:21 PM	#1
pdul diyAudio Member Join Date: Jan 2009	Diamond buffer Hi ! I just bought a board for this on Ebay. Anybody have some experience or comments for this circuit? Is it any good as a linestage in a preamp? How does it sound? Any take on component values before I start soldering? Any input will be wellcome. The pws is onboard standard LM317/337 setup

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4th February 2012, 09:48 PM	#3
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	I use a similar circuit as a headphone amp - in mine the 3K9 resistors are active current sources. It sounds pretty good to me. I scaled mine up a bit - the output devices are MJE15032/3, because I run it with enough bias current that it is class A for 32 ohm loads. Try your kit, it'll sound nice

4th February 2012, 10:08 PM	#4
pdul diyAudio Member Join Date: Jan 2009	What opamp do you use?

4th February 2012, 10:12 PM	#5
pdul diyAudio Member Join Date: Jan 2009	My plan is to use LME 49720

4th February 2012, 10:24 PM	#7
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	I used OPA2134 because i had them

4th February 2012, 10:34 PM	#8
pdul diyAudio Member Join Date: Jan 2009	Do you use A970/C2240 and A1145/C2705 as shown in the schematic?

4th February 2012, 10:44 PM	#9
pdul diyAudio Member Join Date: Jan 2009	Will 10 times amplification be suitable for a linestage ?

4th February 2012, 10:50 PM	#10
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	No, BC550/BC560, and MJE15032/3 for the outputs. How much gain you'll need depends on your source. I found that for a 2V RMS input, no gain was needed. Bear in mind that headphones are typically quite sensitive and it doesn't take much output power to blow your head off!

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