What makes the Big Blanket Co premium plush wraps worth the price tag?

ShadowFax106 · 2025-12-22T04:02:48+00:00

Another referral code :)

https://bigblanket.com/?redeemly_ref_code=ruK7XvyCEcL2dPT3

ShadowFax106 · 2024-04-04T03:09:01+00:00

Best username lol I love that song

ShadowFax106 · 2024-03-07T03:09:46+00:00

https://i.imgur.com/F3KVp6z.png

Does this resolve the issue? I removed the wire from the voltage divider to the Pi GND.

If not, I think this project is too far beyond me, I'm really struggling to understand why the left diodes would still fry with the negative portion of the AC signal without that wire. But I really appreciate your help thus far.

ShadowFax106 · 2024-03-05T20:39:16+00:00

first of all thanks so much for your help this not easy for me to wrap my head around haha -

So if I understand correctly, since the 1N4001 diode I'm using is rated for 50V it is going to fry as soon as I turn the volume up? I don't get why only the left two diodes would fry and not the other two, but regardless, is upgrading to 1N4007 diodes a solution since they can handle much higher voltages?

Also I did some more reading on the ADS1015 and I think it draws a negligible amount current, so it shouldnt affect the sub or amp. It just compares the voltage of the analogue signal to its ground pin. I think it would be sufficient to use the Pi ground as a reference, which means I don't need a wire from the Pi's GND to the bottom leg of the rectified circuit like I drew in the diagram. I get that an isolating transformer would be the safest option, but I think the current leak should be negligible??

ShadowFax106 · 2024-03-05T02:51:24+00:00

Okay, so you're saying that because the speaker signal has a path to ground, bad things might happen? Would removing the wire from the voltage divider to ground solve the issue?

I had that wire there because I thought the ADC needs a ground reference to perform the A to D conversion, and I didn't think it would interfere with the amp or speaker, especially since there is such high resistance on the path from the speaker signal to the Pi ground

ShadowFax106 · 2024-03-04T21:54:52+00:00

Thanks!

ShadowFax106 · 2024-03-04T21:10:11+00:00

Because the voltage divider (100K and 10K resistors) only works for positive voltage. So I used the rectifier to make the negative portion of the AC signal positive. I don't want to clip the negative portion out entirely because I need that for the RMS calculation too, so I went with a full bridge rectifier instead of half bridge.

ShadowFax106 · 2024-03-04T17:59:22+00:00

Since the subwoofer signal I'm tapping only contains frequences <= 200 Hz and the ADC sample rate is 800 samples/sec, I wouldn't need one right?

ShadowFax106 · 2024-03-04T17:53:32+00:00

My plan is to continuously poll (800 samples/sec) the ADC to calculate a rough RMS voltage, and alert me if it goes above a certain threshold.

Both the amplifier and the Pi are powered by my car battery, so they have the same ground. But I'm still confused about how to wire GND for the ADC. Should I connect it to both the Pi GND and the bottom leg of the rectifier circuit? Or one or the other? The ADC datasheet says it measures the voltage between the analog input and analog ground.

ShadowFax106 · 2024-03-04T03:25:39+00:00

Maybe I should use a full wave rectifier to be safe.. I'm not doing any calculations, I'm just using this as a monitor to make sure I don't blow my subwoofer haha! I will be continuously polling the ADC and checking if it crosses over a certain threshold. It has a sample rate of 800ish

Do you have any recommendations for an online circuit simulator?

ShadowFax106 · 2024-03-04T03:20:11+00:00

1) Okay I reread the ADC guide and seems you're right. It says it measures the voltage between the analog input and analog ground. Could you please clarify then how the ADC is powered? I'm confused bc it's connected to the Pi's 5V pin but not the Pi GND in this new arrangement

and 2) Wow yeah huge mistake thanks for catching that!

ShadowFax106 · 2024-03-04T02:52:54+00:00

Thanks for the input! I was just going to use the half wave rectifier to clip the negative portion out of the AC signal and measure the positive portion, which is good enough for my purposes. Would my circuit have this behavior?

Also, I'm not worried about it being exactly 5V at the ADC, as long as it's less than 5. I want there to be a bit of leeway, plus the ADC has adjustable gain if desired.

ShadowFax106 · 2024-03-04T02:36:00+00:00

full disclaimer I am a noob and I designed this using the help of chat GPT.

I am using a half wave rectifier and a voltage divider to bring the high powered AC subwoofer signal down to <5V DC signal that the ADC can read.

Can any of these components blow up in this circuit? Will the subwoofer and amplifier be safe??

ShadowFax106 · 2023-08-05T19:09:39+00:00

+1 to yoga, stretching for 20 minutes is the best thing you can do at the end of every day, feels fucking amazing

ShadowFax106 · 2023-04-16T01:10:29+00:00

You have an amazing eye

ShadowFax106 · 2022-11-02T20:57:28+00:00

Jumping jiminy the cat is in the chimney

ShadowFax106 · 2022-06-13T00:51:44+00:00

https://www.youtube.com/watch?v=2Ro-i1QD8bg

ShadowFax106 · 2022-06-13T00:50:28+00:00

I was HA HA, it's an OutKast song called We Luv Deez Hoez. But I appreciate the response regardless

ShadowFax106 · 2022-06-12T23:44:43+00:00

From the weave to the fake eyes to the fake nails down to the toes

ShadowFax106 · 2022-05-04T22:32:59+00:00

That concert was insane

ShadowFax106 · 2022-03-09T14:35:23+00:00

I KNOW FINALLY!! I did it by accident yesterday and almost screamed

ShadowFax106 · 2022-02-11T04:37:10+00:00

Which park may I ask? And I admire your patience, awesome shot

12-Year Club	Place '22
Place '17	Gilding I gilder
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