I want to build a couple Rat circuits & I see the Rare LM308 is hard to fine & a little pricey compared to other chips .Is there a modern chip manufactured today that will sound pretty much exactly like the original lm308 chip ?.
I believe the new Rats have OP07 chips in them. These are currently in production and sound very similar, though there are some who feel the lm308 is the only way to go with a Rat.
TL070 with a small value compensation cap, higher than the circuit calls for, like 150-220pF
I find the 308 quite easy to find and purchase, but the op07 is a close call, it sounds spot on (and it's the one you find in the later rats)
Some info about the IC for the Rat here: http://www.generalguitargadgets.com/pdf/ggg_rodent_instruct.pdf (http://www.generalguitargadgets.com/pdf/ggg_rodent_instruct.pdf). ;)
Quote from: copperheadroads on February 27, 2016, 11:44:56 PM
I want to build a couple Rat circuits & I see the Rare LM308 is hard to fine & a little pricey
A little pricey, yea; hard-to-find, naaa.
http://smallbear-electronics.mybigcommerce.com/ic-lm308n/
I agree that the TL070 is a good choice, and I have stock. Here is another part that I have tested in the RAT and is a good value:
http://smallbear-electronics.mybigcommerce.com/ic-lm301an/
I will have the OP07 in about a week.
there is a supplier here (AU) with LM308HZ (TO99) at $AU0.35 each (min qty 20).
y'all got roads full of copperheads in 'straya, too, eh?
I use Chinese LM308s, just over $1 a piece shipped and they sound great. Still a bit more than TL070, but I dig them.
Australian Lowlands Copperhead snake, Austrelaps superbus.
(https://s-media-cache-ak0.pinimg.com/736x/06/1f/c4/061fc46b8f67668413c8cd0659dee96e.jpg)
not related, apparently.
Quote from: duck_arse on March 04, 2016, 08:57:21 AM
Australian Lowlands Copperhead snake, Austrelaps superbus.
(https://s-media-cache-ak0.pinimg.com/736x/06/1f/c4/061fc46b8f67668413c8cd0659dee96e.jpg)
not related, apparently.
TOOOOOOOO many compensation caps...!!! :icon_eek:
I think an NE5534 IC may work