TLE2426CLP & op-amps

[Joshatdot]

is the TLE2426CLP's current output of 20mA good enuff for OPA2227PA & OPA2107AP?

Also would a single 9v batt be good enuff? or dual 9v batts?

 

[TzeYang]

dual 9V batts are better for high imp cans.

TLE2426 is good enough for both opamps.

 

[Ace o' Spades]

The TLE2426 will do fine for most all OPAmps depending on the current source.

 

[BlizzofOZ]

I've done 2 CMoy's that have one 9v battery, using the TLE2426 and the OPA2227 amp with not problems.

 

[Joshatdot]

Thanks everyone for your input. Now I just need to design a CMoy layout with the TLE2426CLP. Theres one around here in the DIY, but it uses dual 220uF or 470uF caps, while Tangent's schematic displays single 220uF.

 

[epaludo]

I'd build a cmoy with TLE2426 and OPA2227 with awesome results. Go for it ...

 

[FallenAngel]

Use Tangent's regular CMOY layout, stick with dual 470uF and simply replace the voltage devider resistors with the TLE.

EDIT: Oh, and although most opamps will be ok with a single 9V, stick with 2 for the OPA2107, sounds better and saves you the headache.

 

[Joshatdot]

Like this? do I need all the extra stuff, like the diode, bypass caps?

 

[splaz]

You don't 'need' them but they're useful additions, no harm putting them in.

edit: Although I do believe you may need the bypass caps if you used a more 'cranky' op-amp as some may call it.

Also you need the crowbar if you hook up the power polarities wrong...

 

[Joshatdot]

Quote:

Originally Posted by splaz /img/forum/go_quote.gif You don't 'need' them but they're useful additions, no harm putting them in. edit: Although I do believe you may need the bypass caps if you used a more 'cranky' op-amp as some may call it. Also you need the crowbar if you hook up the power polarities wrong...

do the bypass caps eliminate the power on-off pop/clicks?

 

[TzeYang]

joshatdot, no they dont. You'll need a dc muting relay circuit for that purpose.

Also, i thought the 2107 is unity gain stable and internally compensated? It shouldnt really require bypass caps.

 

[pinkfloyd4ever]

1) what's unity gain?
2) So the rail splitter can handle the current of 2 9v batteries?

 

[Joshatdot]

Quote:

Originally Posted by pinkfloyd4ever /img/forum/go_quote.gif 1) what's unity gain? 2) So the rail splitter can handle the current of 2 9v batteries?

1. I am not really sure. I think it means the amp output voltage is the same as input voltage, like gain of 1 or 0?
2. the TLE2426CLP can handle 4v-40v.

 

[splaz]

1. Someone posted a link on it not that long ago, try a search on it. Although you can think about it as a gain of 1 apparently that is incorrect or something like that... I don't know. Look it up.

 

[Joshatdot]

From Wikipedia:
Quote:

A buffer amplifier (sometimes simply called a buffer) is one that provides electrical impedance transformation from one circuit to another. Typically a buffer amplifier is used to transfer a voltage from a first circuit, having a high output impedance level, to a second circuit with a low input impedance level. The interposed buffer amplifier prevents the second circuit from loading the first circuit unacceptably and interfering with its desired operation. If the voltage is transferred unchanged (the voltage gain is 1), the amplifier is a unity gain buffer; also known as a voltage follower. Although the voltage gain of a buffer amplifier may be (approximately) unity, it usually provides considerable current gain and thus power gain. However, it is commonplace to say that it has a gain of 1 (or the equivalent 0 dB), referring to the voltage gain.

but I don't know how to calculate unity gain. i think it depends on your headphone impedance & input resister.