[sdiy] TL07x

[Ken Stone]

The main problem re decoupling/bypass when using a TL074 is those hair width
wires between the chip carrier and the chip die. Users of the IC package
simply cannot get decoupling in that close where it's really needed, thus a
072 or even an 071 can be more appropriate. 

If the op-amps are mostly just dealing with slow moving or DC voltages, a
074 is fine and dandy. If you are processing fast moving or edged waveforms,
it is a good idea to group op-amps so they don't interefere with each other
- thus the use of 072s, and 071s where an 074 initially appears to be
appropriate.

Ken

>I think in some cases the fact that power is drawn from the same pins for
>more than one amplifier, unwanted signal transfer between amplifiers can
>occur via the IC's internal power connections.  I.e., you can't bypass the
>power for each opamp inside the package.
>
>----- Original Message ----- 
>
>> Hello,
>>
>> Is there reason not to choose TL074 over 2 TL072 ?
>> I see some schemas with several TL072 where it would have been cheaper to
>> use
>> TL074 :)
>>
>> So ?
>>
>> Linium
>>
>
>
>---------------------------------------------------------
>- Where merit is not rewarded, excellence fades.
>- Hydrogen is pointless without solar.
>- What good are laws that only lawyers understand?
>- The media's credibility should always be questioned.
>- The only good terrorist is a dead terrorist.
>- Governments do nothing well, save collect taxes.
>
>-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
>-- Linux Rex         | RedWebMail by RedStarWare
>-- FatMan: home1.gte.net/res0658s/FatMan/
>-- NonFatMan: home1.gte.net/res0658s/electronics/
>-- Autodidactic Master of Arcane and Hidden Knowledge.
>
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>