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ampage archive
Vintage threads from the first ten years
pedal power stuff
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 4/17/2000 6:24 PM |
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| bob | pedal power stuff thankyou for helping me with my previous question on multiple regulators on the one tranny tap. i'd like to ask a couple more dumb questions. how many and where can i place these regulators in the crt. i'm using a 2A tranny. i've decided to run two regulators one for normal operation and one for the dead battery. where should i feed the two crts from, before or after the filter caps? if after, should i increse the value of the filter caps?and is there any point to running a lower current regulator per pedal, or running a couple of big beefy ones? thanx |
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| 4/17/2000 6:36 PM |
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| gus | You could run the two from the one reg use a 1n400x to drop the voltage about .9 per diode and place the resistor after the diode for the lower voltage and resistance modulation. I use the diode drop one ps for Tuning in effects that like lower voltage. With the currents most effects use you can use different diodes for different voltage drops, you could use a small cap at the diode resistor node. |
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| 4/17/2000 8:24 PM |
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Don Symes |
Pick all the regulator inputs off at the filter cap. At these relatively low currents, adding more filter may not help much, but it can't hurt. On the plus side, one reg (+ output filter cap) per output lets you do anything you want. It costs more in terms of parts and board space, of course, but may be more reliable (less stress on any one reg). If you've got the board-space budget for it, start out with 1 - 3 regulators, with space planned out to add more (and neat features like individual dead-batt stuff). Use a larger bridge than you need, so you can just move to a bigger tranny when/if you ever need to. Just remember, I _am_ a feature creep. Simple _is_ better in the long run. |
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| 4/19/2000 5:45 AM |
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| bob | thanx for your help. very useful. the last issue which i want to deal with on this, is about ground loops. if i run say 3 reg crts, they will all share a common ground. would a ground lift switch on say two of the outputs be a viable idea. anyway thanks again, you guys rock! |
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| 4/19/2000 3:45 PM |
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| Eric H |
Bob, Steve Dallman has a reply about 4 threads down from this one (9V ...something) that seems like a good way to avoid ground loops. -Eric |
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