Transparent Buffer?

[NeveSSL]

Hey guys!  I was wondering if there is a buffer circuit that sticks out as more transparent than most?  Or are they all pretty much equal?  Thanks!

Brandon

[gaussmarkov]

Hey guys!  I was wondering if there is a buffer circuit that sticks out as more transparent than most?  Or are they all pretty much equal?  Thanks!

Brandon

The AMZ MOSFET Booster was designed to be a transparent boost.  It's very popular for this purpose.

[R.G.]

Single  device "buffers", whether bipolar, jfet or mosfet, are inevitably going to have some coloration of their own.

It's remarkably difficult to make a buffer more transparent  than a JFET input opamp set up as a non-inverting gain stage as long as you never make it exceed its power supply limits. Within its limits an opamp buffer is about as non-distorting as you can make a buffer.

MOSFET buffers are popular because they have quite high input impedances and so have very little treble loss - which may or may not be something to try for.

I personally think that they're more translucent buffers than transparent buffers.  

[gaussmarkov]

I personally think that they're more translucent buffers than transparent buffers.  

:roll: As in "semi-transparent?"  :lol:

[Joe Kramer]

It's remarkably difficult to make a buffer more transparent  than a JFET input opamp set up as a non-inverting gain stage as long as you never make it exceed its power supply limits. Within its limits an opamp buffer is about as non-distorting as you can make a buffer.

Yeah, what RG said.

And if you use film coupling caps, a higher supply voltage, and a high performance op amp (say OP275 or OPA2134) the more neutral or "transparent"  a sound you'll get.

Regards,
Joe

[Mark Hammer]

The closer it is to unity gain, the greater the likelihood of it remaining "transparent" in the face of any signal you throw at it.

[gaussmarkov]

The closer it is to unity gain, the greater the likelihood of it remaining "transparent" in the face of any signal you throw at it.

OK.  I sit corrected.   NeveSSL wants a buffer, not a booster. :oops:

[NeveSSL]

Hey guys!  Thanks for the replies.  I will check out the AMZ.

Does anyone know what type of buffer the Axess Electronics is?

Thanks again for the info!

Brandon

[AmpliFuzz]

As far as unity gain buffer circuits go it doesn't get much simpler than this:

http://www.tubefreak.com/buffer.htm

You didn't specify what you need it for, so it might just be the ticket.

[gez]

As far as unity gain buffer circuits go it doesn't get much simpler than this:

http://www.tubefreak.com/buffer.htm

You didn't specify what you need it for, so it might just be the ticket.

It does if you use a single op-amp (non-inverting)...no resistor!

[puretube]

...bias ?  :?

[gez]

...bias ?  :?

If it's a buffer it assumes that there's a stage prior to it, in which case it provides bias if DC coupled.  I used to do this with CA3080s.

I was making assumptions though (original post wasn't specific having said that).

[Bernardduur]

I build this http://www.generalguitargadgets.com/pdf/ggg_ic_buffer.pdf and I found it quite transparant..... I never heard any signal changes while using it unit I turn it off and my long true bypass chain begins to act.

Oh, and I did not add the LED..... so mine is much more sinplistic that this one. I found it. I build this http://www.singlecoil.com/tb-strip/buffer.pdf

[toneman]

i've got a transparent aluminum case for the transparent buffer.
thanx Scottie!!
Trouble is....i can't find it.....:shock: