Mon Dec 6 20:38:33 EST 2010
Picking a staple OpAmp (TL072/TL074)
EDIT: I'm picking TL072/TL074 for audio, which is old and definitely
not best, but it's cheap and probably good enough. For other apps the
cheapest LM358N/LM324N will do.
Next to transistor selection, there is opamp selection. What I have
in the box is this:
- 6 x MAX494 $3.96 @1k quad, precision, low power, rail-to-rail, single supply +2.7V to +6V
- 5 x MAX4167 $1.29 @1k dual, ..., high output drive
These are Maxim samples, only useful for 5V operation, not the
stomp-box 9V plan.
Maybe I pick something simpler like
- 2 x LM324N, quad, single/double 3V-32V (F: $0.25 0.22)
- 3 x LM358N, dual, low power, single/double 3V-32V (F: $0.25 0.20)
- 2 x TL072CN, dual, low noise, jfet, 36V (F: $0.25 0.22)
- LM339N, comparator, $0.33 @ 1k
From what I read it seems that for cheap opamps, the LM358 isn't so
good because it hass class-B output. The TL072CN is old and there are
better opamps, but it's cheap and probably good enough for audio, so
that's what I'm going to order.
Audio: TL072/TL074 md5://e80e5dbb8b58ec9baced943a50902bca
Non-audio low power: