Recent content by bipolar

There are also differences for solid and stranded wire for resistance/current ability. Something to keep in mind. They are very small, but exist.

The solderless breadboard itself has small conductors internally, they are designed for small signal prototyping, and have rather high resistance compared to the soldered, wide tracks on a pc board. The wire size isn't as much of an issue as the voltage fluctuations while switching higher...

They also have efficiency levels high enough to pay for themselves after a long period of use in electroplating. The small ones (under 100A) aren't super expensive - roughly $3-$4/Amp, but are very efficient switching supplies with extremely stable output.

Solid core 22ga is 5A continuous, 7A peak with DC at 25% duty. The breadboards I've worked with melted when high current (5-10A) was drawn in PWM, so now I run a header out to a small PCB with the High Heat components mounted to it, along with a separate run to the PCB for the power lines in an...

I have a question for jeff: What is a good source for elements useful as transformers? Are they built in house, or do the transducers come as "a unit". I've seen piezo-transformers mentioned for anywhere from 500Hz to 20kHz+. When operated in the audible range, don't they make an...

Active crossovers still give some phase shift. The only "phaseless" boost at certain frequencies would have to be done digitally, but there are phase shifts involved there if not designed properly. Unless applying a DSP from a digital source to the next component, a DAC/DSP/ADC seems to be...

Building a better flux capacitor? I seem to recall mist around the flux capacitor in Back to the Future...

Heh, I've done that with Transistors.

There are power strips made that automatically turn on the rest of the outlets when current is detected in the "trigger" outlet. There is a threshold adjustment knob to set the sensitivity of the trigger outlet. They work with about everything once the adjustment is set. I forgot the...

Remember, the sinewave has been fullwave rectified, so the frequency has effectly doubled. You are on the right track with the ripple voltage. Power = V * A, or I²R, using the 10V and current given. I'd like to see you understand the process, rather than patch together advice from...

This Tool Will help you draw a diagram quickly. Set up the optics and sources, then take a screencap to post.

Any transients/noise floor that are audible are due to the internal amp power supply, or a different location/position of the amplifier and system, and not related to the power source. As I stated, if your household source did have enough noise to get past a properly designed amplifier power...

I'll get you started with calculating A. After that, B and C are derived from the results found while calculating A. We are given: V_{AC}=12V_{RMS}@70Hz I_{RMS}=7.617 The 'hard part' is determining voltage and frequency after full-wave rectification, 1V drop for each side of the...

It isn't very intuitive, especially when working with different types of motors, where the formula you posted for speed is correct. I scratched my head the first time I saw the internals of one. I took it as handwavium proof that Physics works at the time.

The AC power is filtered, converted to DC and heavily filtered more to eliminate the 120Hz Ripple. These steps make any noise on the AC line isolated from the audio signal. If the power is stable enough to run a PC, Display, etc, the AC line is OK. If there is audible noise from the power in...