All frequent questions about ICs of all kinds, will be stored here.
- Breadboard Brother
- Posts: 67
- Joined: 17 Jun 2008, 13:13
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Yes - I've had MAXX's die on me as well...likely for a similiar reason: wallwart 9V supplies. I wonder if 9V batteries are culprits (as much) here?
Some 9V adapters put out a bit over the top as well..plus, maybe MAXXs aren't designed for wallwart levels (?) I've gauged my RS 9V filtered adapter (lg bodied) @ an actual 11-12 V when going into my breadboard supply!
I'd try this: put a 100 or so ohm resistor pre MAXX 1044 - that should bring the voltage down just a bit. Then you might derive a bipolar supply w'out killing the nice MAXX. I'd think 8.5 V wouldn't really harm your headroom/pedal fidelity - or would it?
@ any rate tho' I plan to upgrade as per the suggestion for the LT1054 & the TC______ unit.
Biploar supplies are a must when you get into Boscorelli-land.....or , you have some circuits on your custom PT that need more headroom ; phaser-vibe-complex modulation clones,etc
- Old Solderhand
- Posts: 5138
- Joined: 09 Jan 2008, 07:02
my favorite amplifier
Traynor YBA-III, Fender Super Six
- Completed builds: custom fuzz.
- Location: Inner Earth
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i'm planning on running a MAX1044 for -18v supply, possibly 2 for switching to neg gr and doubling, but i'm not there yet. what has been decided on as far as diode protection goes? is it best to run it in series or parallel? and that is always cathode to + no matter if pos ground, correct?
"You've converted me to Cubic thinking. Where do I sign up for the newsletter? I need to learn more about how I can break free from ONEism Death Math." - Soulsonic
- Solder Soldier
- Posts: 162
- Joined: 16 Mar 2008, 19:04
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I've used the ICL7660S on several of my own pedals frequently used at home and several that have gone out - both as polarity converters and as charge pumps and have not had any problems with mine or had any returns (touch wood). only issue was once ordering without the 'S' suffix, these introduce a whine to audio circuits.