Recent content by preston8

Indeed it appears to be a "contactor". I understand what role they play in this system now, thank you.

I am in the process of reverse engineering an electrical control box for a spa heater, and have stumbled upon a component that I have not encountered before. There are two of these components in the system. I was not able to find any information from the part numbers. The coil leads me to...

Hello, I'm needing to send an intercom signal from a lobby to one of eight different rooms. I am creating a touch-screen interface with a Raspberry Pi under the hood that acts as an intercom. The user needs to be able to select any room they wish to speak to (even all of them at the same...

Thank you for clearing this up and providing additional information that I was not aware of.

I'm probably not the best person to perform the tuning. So, I would need to strike every bar, compare it with a tone generator, and tune the bars in the same session? I'm confused why a temperment is needed when we're just going to change the pitches based on what sounds correct. Based on a...

@bahamagreen Are there devices that can identify the "perceived" pitch of my bars instead of the "correct" pitch? Or is this something that is done by ear? My particular device only shows the true pitch.

@AlphaZero: I actually used the formula you posted to derive the lengths for my initial set. I found that the lower pitch bars were spot-on, but pitch error became more pronounced as I tested higher pitched bars. I was hoping that by using a curve fit, I could get even more accurate. I...

Hello, I'm creating a musical device which has stainless steel bars cut with a laser cutter. They are all the same length but vary in width. I created a set of test lengths (50 in total) and tested the pitch of each one using a tone analyzer. Now I'm looking to fit a curve to the data so...

The mallet head needs to be moving at an adequate speed during impact. To get the speed, I need to mount the solenoid very close to the fulcrum. I understand that I will need to get a solenoid that is powerful enough to deliver 0.5N of force. This may require a solenoid with force equivalent to...

I'd like to keep this thread alive with another question. I've looked over my physics book to review torques and equilibrium and believe I have setup the following problem correctly. Basically, I want to find out approximately how much force is translated to the tip of the mallet. Would...

Hey thanks. I'd like to clarify the poundage calculations. I believe 1N = 0.2248 pound 102mm above bar: 0.322N (32.3g) = 0.072lb 130mm above bar: 0.366N (36.6g) = 0.083lb 165mm above bar 0.412N (41.2g) = 0.093lb

I analyzed the audio from the video and I believe that the impact time is considerably shorter than 1/10 second. As you can see in the waveform, the metallic "ting" sound lasts only for about 0.018 seconds. I believe that the initial ting sound is the impact, and the rest of the waveform is...

Simon, Here's the value I have reached: \sqrt{9*9.8*0.089m/2}* (0.0022kg + 0.5 * 0.0011kg) Result: 0.0054N That's about 1/1000 of a pound. Does that make sense? Would an estimate be easier to arrive at if we assumed that we were simply dropping the ball (no arm attached) from a set...

Thanks Simon, Help me understand a few things here: 1) What is the difference between F(t) and Fpeak 2) What is the difference between Δt and t I plan on utilizing a solenoid with a built-in spring return, by the way. Preston

I've created a video demonstrating my test. 1) The bar absorbs a majority of the energy. It only rebounds about 1/4 inch. The mallet was dropped at 89mm above the bar. 2) When you play a glockenspiel, you need to pull back the mallet arm immediately after the strike. If you let the...