Electronics > Beginners
The "I made this!" thread - Beginners achievements with pride.
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BrianHG:

--- Quote from: paulca on March 14, 2018, 08:19:07 am ---Not sure if it helps or gives you ideas, but the sub woofer I have for my car (with built in amp) exposes it's amp parameters.

Freq - the peak point of the gain frequency.
Q - The width of the frequency which is gained.
Gain - How much gain is applied.
Level - The amp output level.

It's important when you put the woofer into an enclosed space that you try and avoid gaining too much frequencies that cause standing waves or resonance in the car body which just rattles stuff.  I found with everything in the middle mine sounded fine until I put the back seat up, then it sounded boxy and boomy.  So I dropped the frequency and tightened it little to avoid boosting the higher bass frequencies, this fixed most of that problems... just my fillings that rattled then.

Also, enjoy this:


--- End quote ---
In the 25hz setting on my Subwoff booster, that's nuts.  I don't think my neighbors like me anymore.  But, in the 20hz and 15hz settings, that music doesn't do much except for the odd fewest lowest notes in the 20hz setting.  In fact you know it's bass since you can hear it...

That music is mostly bass, not subsonic.  Even the cheapest film/movie, or good TV show has tremendous effects in the 20hz setting.  Only the very special scenes are in such Hollywood action blockbuster makes it through the 15hz setting.

Remember, a lot of subwoofers start below 100hz, or 50hz, or 40hz.  I'm talking about the inaudible stuff below 25hz.
lordvader88:
Cut up and re-used a TV remote control PCB to make a little series pass regulator with LM358 and LM336 Vref , for 3V to power a cheap but functional Vici VC99 DMM. Its using off a 12V transformer. PCB fits neatly in the battery case. 1/2 deadbug, 1/2 through-hole
jerryk:
My security upgrade is now in its final resting place next to the old system I had installed over thirty years ago.  The enclosure was an obstacle by itself but worked out in the end.

I did make a few mistakes in the final board run.  The main power plane connecting all of the 220 resistors to the optocouplers had a tiny gap that mean I got to solder bridge all the resistors to that plane.  I created a couple of unconnected islands that had to have belated vias installed.  I omitted a control wire from the pi to the adc, hence the jumper wire around the pi pins.  With a few more ugly solder bridges here and there it actually works as planned.  The biggest goof was mounting the pi mirror image to my intentions.  It was supposed to go directly under the board and not staggered.  I spend so many hours checking so many things and missed that one!  Regardless of the stumbles, it's functionality is beyond my expectations.  The best part is remote control of the keypad.  Unravelling the serial code used to control it took a while but the ease of making changes to the panel via a computer instead of the dreaded keypad is worth the effort.

Thanks to all of you that helped me in this project.

Jerry
BrianHG:
 :scared: The Subwoff 'Lost In Space 2018 trailer' audio demo is here: https://www.eevblog.com/forum/projects/free-subwoofer-audio-processor-project-for-forum-members/msg1453438/#msg1453438

yashrk:

--- Quote from: jerryk on February 27, 2018, 08:46:59 pm ---I'm suffering from severe excitement.  My boards just came in from PCBWay.

Jerry

--- End quote ---

Nice rounded corners  :-+ :-+
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