Post Created date
12 volt / 10 amp PWM from a micro controller?
I'm attempting to control the heater block for a 3D printer. I don't think the speed needs to be great. I'm just planning on measuring a thermistor and adjusting the duty cycle...
Tuesday, 21 August 2012 - 00:09
Ohm's Law / Limiting Variable Current to a Specific Value
Quote:It's never "safe" to exceed the manufacturer's specifications for any given component, including motors. There is usually a leeway you can play with if you know what you are...
Thursday, 16 February 2012 - 02:11
Ohm's Law / Limiting Variable Current to a Specific Value
@Bob Gardner thanks, I think... Still a bit confused though... @JC so our 120(?) ohm load (the LED)... at 5v will sink ~42 ma? -- I guess that explains why hooking up "too much...
Thursday, 16 February 2012 - 01:42
V-USB Circuit works on breadboard, but not on Veroboard?
meteor wrote:Cool project! Thanks for sharing the photos. It reminds me of Rob 'CmdrTaco' Malda (of Slashdot fame) and his MAME cabinet project. Yeah, the homebrew MAME cabinet...
Thursday, 16 February 2012 - 01:14
Ohm's Law / Limiting Variable Current to a Specific Value
@JC -- so then... I see you can divide volts by pairing a resistor with a load... to get the voltage correct... -- but it seems current is not divided down to some lower value in...
Thursday, 16 February 2012 - 00:53
Ohm's Law / Limiting Variable Current to a Specific Value
10 watts/120 volts = ~.083 amps (an order of magnitude less...) 120 volts/.083 amps = ~1.4K ohms... ... so a load rated for 1.4K ohms when hooked up to 120 volts is going to suck...
Thursday, 16 February 2012 - 00:45
Ohm's Law / Limiting Variable Current to a Specific Value
Downloading now! Thanks for that. I edited/appended my previous post (forgot to refresh first), I think I get it a little better now.
Thursday, 16 February 2012 - 00:25
Ohm's Law / Limiting Variable Current to a Specific Value
hugoboss wrote:That's not what I said though. hugoboss wrote:To follow the water pipe analogy, think of resistance as the pipe diameter. A smaller pipe exhibits more resistance to...
Wednesday, 15 February 2012 - 22:05
Ohm's Law / Limiting Variable Current to a Specific Value
Thanks guys for all the responses, and for bearing with me through all this! :-) So, from reading through the answers, it seems it depends on the type of load then -- either the...
Wednesday, 15 February 2012 - 21:36
Ohm's Law / Limiting Variable Current to a Specific Value
JC, what you say about the resistor and the LED, from my experience is correct, but I'm missing how the dots connect... For example you say if I hook up a 1 ohm resistor to 5V it'...
Wednesday, 15 February 2012 - 01:04
V-USB Circuit works on breadboard, but not on Veroboard?
Here's a gallery of the semi-final results, it's all working great, but for the moment I've ripped it back apart to do some wood filling, sanding & painting, anyways, thanks...
Tuesday, 14 February 2012 - 22:48
V-USB Circuit works on breadboard, but not on Veroboard?
meteor wrote:Upon further thought, assuming he's using the circuit at the bottom of this page, I don't think the OP should use any "2 (or 3) diodes in series" technique to drop...
Tuesday, 24 January 2012 - 07:18