I read the directions on the road rage instructions and I'm a lil confused about it. Does this IC work with 18v setup? I hope so.
you can't use it with a 18v input, it's only rated for 10v. you can use it to generate voltages higher than 10v (or -10v for that matter).
ok good so I can use it to make 18 from 9?
yep, sure can. just make sure to measure your power supply (if it isn't regulated) to make sure it's not over 10v.
I always use tc1044spca instead of the max chip since it can take a little more voltage up front and it's cheaper.
i think it should be tc1044scpa, not spca, correcting just for the purpose of google searches.
oops, you're absolutely right. my bad.
here's a link (http://www.mouser.com/ProductDetail/Microchip/TC1044SCPA/?qs=cC9UkDmCsZtU9kTPnqaTBA%3d%3d) to the part.
where in the hell can I get one of these chips? I can't smallbear it can I? What's a more exotic IC suplier
The TC1044? You can get them at Mouser. I think you could find them on eBay as well.
For what it's worth, if you are placing an order from Smallbear, you should get a MAX1044 from them rather than pay for another shipment - unless you can get free shipping for that chip.
Jacob
good call. That's what I did. Fortunitly I got lucky this time bc I assumed with out asking. My judgment served me well. Plus.. I'm only really trying to get 18v.. No more. What I wish I could do is select 12v, 15, 18v. That would be so useful. I'm guessing also all the elect. Caps on the road rage are for filtering?
sorry to double post but I just had a gnarley idea. I actually ordered a 2nd road rage a few days ago for the hell of it. Would it be a waste of a chip to put 2 of them in the same enclosure on a switch as a multi task tool. Or actually what I'd rather do is have a dual output. Like a dc brick kind of deal. Could I do this off of one 9 volt supply? I have a godlyke daisychain with alot of mA. Could I run a pedal off 12v on one board and 18 from the other at the same time? Or too much?
I have found the ICL7660S.can i use it for max1044?
Quote from: 9Lives on December 27, 2011, 04:57:45 PM
sorry to double post but I just had a gnarley idea. I actually ordered a 2nd road rage a few days ago for the hell of it. Would it be a waste of a chip to put 2 of them in the same enclosure on a switch as a multi task tool. Or actually what I'd rather do is have a dual output. Like a dc brick kind of deal. Could I do this off of one 9 volt supply? I have a godlyke daisychain with alot of mA. Could I run a pedal off 12v on one board and 18 from the other at the same time? Or too much?
You could do that, the MAX1044 only has about 10mA output capability, it wont draw too much.
Quote from: dromilious on January 19, 2012, 03:35:46 PM
I have found the ICL7660S.can i use it for max1044?
Yup, same deal, as long as it has that S suffix it'll be fine.
thanks for your answer.i ordered 10 pieces for 5 dollars :)
hey I finally got my road rage working. It was my meter the whole time..... I didn't wanna just plug abd play and fry everything. What I do want to know is if all my +- capacitors are 16v rated will having an 18v supply fry them? By the time the voltage gets to them will it be lower than 18v? If it's just headroom and 16v are ok I'm bout to hook RR's to everything lol.
For safety's sake it is best to have all your capacitors rated slightly higher than the maximum voltage of your circuit. Capacitors sometimes swell up or even explode when their voltage is exceeded. I would recommend 25V capacitors for running your circuit at 18V. Save the 16V ones for a 9V project.
Just a few random observations about charge pumps.
The LT1054 is a great replacement for for the 1044, it accepts up to 15V for the input voltage and has a current capability of 100mA.
7660 have a maximum input voltage of 12V I think.
7661 and 7662 chips will accept up to around 20-22V at their input.
When you double the voltage you halve the current. For example using the LT1054 as a voltage doubler reduces it's available current to 50mA. This is important because if you're using a charge pump with a low maximum output current (MAX1044) at 18V in a circuit with a high current draw you may run into problems.
Charge pumps can be paralleled for increased current capabilities. Using 2 LT1054 chips would give you 200mA at 9V and 100mA at 18V. I plan to try this when I box up my Warhead Vibe build to see if it makes any difference over a single charge pump version when dialing it in.
Quote from: Jeff B. on January 23, 2012, 06:28:26 PM
Just a few random observations about charge pumps.
The LT1054 is a great replacement for for the 1044, it accepts up to 15V for the input voltage and has a current capability of 100mA.
7660 have a maximum input voltage of 12V I think.
7661 and 7662 chips will accept up to around 20-22V at their input.
When you double the voltage you halve the current. For example using the LT1054 as a voltage doubler reduces it's available current to 50mA. This is important because if you're using a charge pump with a low maximum output current (MAX1044) at 18V in a circuit with a high current draw you may run into problems.
Charge pumps can be paralleled for increased current capabilities. Using 2 LT1054 chips would give you 200mA at 9V and 100mA at 18V. I plan to try this when I box up my Warhead Vibe build to see if it makes any difference over a single charge pump version when dialing it in.
Hmm, I neglected to see this until you mentioned it. It makes complete sense. At the cost of doubling V you halve the mA. Nothing comes without a price :D
Josh
Quote from: gtr2 on January 23, 2012, 09:34:39 PM
Quote from: Jeff B. on January 23, 2012, 06:28:26 PM
Just a few random observations about charge pumps.
The LT1054 is a great replacement for for the 1044, it accepts up to 15V for the input voltage and has a current capability of 100mA.
7660 have a maximum input voltage of 12V I think.
7661 and 7662 chips will accept up to around 20-22V at their input.
When you double the voltage you halve the current. For example using the LT1054 as a voltage doubler reduces it's available current to 50mA. This is important because if you're using a charge pump with a low maximum output current (MAX1044) at 18V in a circuit with a high current draw you may run into problems.
Charge pumps can be paralleled for increased current capabilities. Using 2 LT1054 chips would give you 200mA at 9V and 100mA at 18V. I plan to try this when I box up my Warhead Vibe build to see if it makes any difference over a single charge pump version when dialing it in.
Hmm, I neglected to see this until you mentioned it. It makes complete sense. At the cost of doubling V you halve the mA. Nothing comes without a price :D
Josh
Actually, this is one of the few cases where you
almost get something for free.
these switched capacitor charge pumps operate at very high efficiency, usually in the 90% range, greater than 95% for some operating points (but dropping to ~80% for some "worst case" scenarios). this means you're getting
almost as much power out as you are putting in (easily proved with the formula for power, P(in) = IV ~= P(out) = (I/2)(2V)(n) where n is efficiency), and this is quiet rare for most energy conversion methods.
Can you imagine if your car was anywhere close to 90% efficient?
I have a pedal with a suspected blown MAX1044 (Snarling Dogs Mold Spore) ...So reading this thread could I simply just drop in one of the ICs mentioned as a replacement, or would I need to check the pinouts etc?
Or use a max1044. Smallbear has them.
Jacob
Quote from: rps-10 on January 29, 2012, 07:44:00 PM
I have a pedal with a suspected blown MAX1044 (Snarling Dogs Mold Spore) ...So reading this thread could I simply just drop in one of the ICs mentioned as a replacement, or would I need to check the pinouts etc?
You can use a TC1044 with no changes. A TC1044 may be a good choice because it can take a few more volts on the input than the MAX1044 can take. The LT1054 may require you to remove pin 1 if they have 1 and 8 shorted on the pc board (and they cost 3 times as much) so I wouldn't use one unless you needed it for a higher current draw pedal.
Quote from: jkokura on January 29, 2012, 07:47:57 PM
Or use a max1044. Smallbear has them.
Jacob
Could do, but as shawnee's post below your's suggests. My thinking is why replace a fragile part with the same if I am going to take that beast apart. So I may as well go for a more reliable part of the same design to save doing it again in the future.
(I'll solder in a DIL socket too while I'm at it)