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mac72

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  1. audioguru: I used the 5k pot because that's what was listed on the circuit design I borrowed. That's what I get for not doing my own math, right? Anyway, my measurements are taken as follows: [V+] === |------------------------| === [ammeter] === | (+) | |regulator circuit board | | test | | | | lamp | [V-] === |________________________| ================= | (-) | Thanks, Mike
  2. audioguru: I removed the current-limiting resistor, but I'm still getting the same current readings out of the voltage regulator. It's putting out 9v, but it doesn't seem to be supplying very much current. I've checked all my paths and connections, and it seems right. The potentiometer works, and I can vary the voltage between 6v and 9v, but no matter what the setting the amperage allowed through is the same: not enough. Thanks, Mike
  3. Suraj: Thanks, but I may need a more in-depth explanation of what you said. I'm unclear as to where I'd be connecting and what I'd be measuring. Thanks, Mike
  4. Dazza: For testing, I'm using a variable voltage wall wart that puts out a couple of amps. I've got a resistor on it to hold the current at 250mA for this project. Ultimately, I'd like to use a 12V camcorder battery. audioguru: I can't get more than 20mA from it. I've hooked up various light bulbs to it, and the current draw is never more than 20mA. [edit] Sorry, the voltage is just as I want it to be, around 9v, and it doesn't change. It seems like I got the voltage part right, but the current draw is killing me![/edit] I'm hoping I can get to the bottom of this. I'm going to recheck my circuit and make sure I didn't screw anything up.
  5. Greetings! My first post... Sorry I'm such a newb, there may be a really simple answer to this: I made a voltage regulator using an LM317 and the circuit design at the top of this page: http://www.uoguelph.ca/~antoon/circ/ps-lm317.html. It works perfectly, except that it only passes about 20mA, and I need at least 80, preferably 90-95. I've tried to read up on what I'm doing, as this is a newly found hobby, but I'm still not clear on lots of things. Any ideas? Thanks in advance, Mike
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