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Re: Voltage Regulators and Heat Issues
OK so with this new revelation about the speaker only needing a much smaller dc voltage to make a very loud sound, i'm thinking a 12v regulator connected to the Arduino's Vin then power the sensor off the +5 pin on the Arduino, rely on internal VRef for sensor readings, then just hook that speaker to a digital out pin and bring it high if and when i need the alarm. That simplifies my design by a lot and simplicity breeds reliability!sigpicComment
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Re: Voltage Regulators and Heat Issues
That changes things now does it...
I was playing with one of my piezo buzzers with built in oscillator and it was quite flaky, probably because it's cracked. But it was modulating kind of funny until I noticed I had my finger on and off the hole the sound comes out of the case...Comment
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Re: Voltage Regulators and Heat Issues
I use these boards before and they work very well and you do not need a heat sink on them
http://www.futurlec.com/Mini_Power.shtml
I know that the input for this chip is 12 volts and drop down 5 volts
But the IC chip that is used comes in different flavors if I remember right there is a 15 volt version of itLast edited by sam_sam_sam; 03-20-2019, 03:52 PM.Comment
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Re: Voltage Regulators and Heat Issues
It's surprising how loud these piezo buzzers can get... The flaky one I have is only a about 1cm in diameter.
I have another piezo buzzer from an expired CO alarm with a 4cm piezo element. This necessarily is also really loud, but even that 1cm one is quite piercing.
I have one apparently raw transducer that I never could get much volume from, makes me want to double check it's not got an oscillator in it.Comment
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Re: Voltage Regulators and Heat Issues
Loved the story about unknowingly covering the audio output hole ... brilliant! lol
I've noticed piezo's do really well when they can be fastened flat against any kind of hard material ... which will act as an amplifier for the sound waves. It's not uncommon to see just the disc secured to the chassis of some device ... the chassis at that point becomes a speaker... the technology is stupidly simple yet their application is vast and potent.sigpicComment
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Re: Voltage Regulators and Heat Issues
These buck converter ICs ... they all seem to claim that they switch at some frequency ... are these things PWM devices?sigpicComment
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Re: Voltage Regulators and Heat Issues
Yes, all switch mode power supplies use some sort of PWM to regulate.Comment
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This project that I am working on the Engraving Machine has been a challenge to make everything to work together
The information on the internet is hit and miss for the most part
It is a good thing that I know how and what it takes to hook up most micro controllers yes each model is a little bit different but for the most part they are the same
The BIGGEST problem has been the markings on these Arduino Nano Controller boards not all are the same some board are marked better than others
You see how I have to hook up the laser and Nano Controller... -
Hello
I've got two W530 boards, one with K1000M and one with K2000M graphics card. The first one had an issue of turning off under heavy CPU load after about 30 minutes or in idle. GPU load wasn't causing it to shut down. Trying to turn it back on would only make the power LED to come up for about 2 seconds without fan spin or thinklight flash, and that's it. It also wasn't charging the battery after it died.
Gently pressing the laptop in left upper corner would fix this problem for a couple of days.
The latter is completely dead and has the same 2-second power blink, nevermind... -
Mounting and Handling Guidelines for TO220 TO220F TO247 Cases / Packages
The TO220, TO220F and TO247 are the popular packages for power devices because of their versatility and ability to dissipate moderate amounts of heat. This application note describes the basic guidelines for handling power MOSFETs in TO220, TO220 and TO247 packages shown in Figure 1. Please note that only mechanical and soldering guidelines are covered here. Additional precautions are required for isolating high voltage rated devices to meet safety regulations.
Securing a good thermal interface between...10-07-2024, 04:35 AM -
Hi, trying to troubleshoot some problems with this laptop I just finished repairing which had power issues (Burnt Buck converter - SY8883DFC shorted to ground).
After repairing the above issue, I realized the following remaining problem,
Sound only comes from bottom speakers, top palmrest speakers don't work. Neither does the headphone jack (static/buzzing).
The computer recognizes headphones are connected and displays a popup in windows
Sometimes, the computer will boot up and the sound will be working fine. However, if I run intensive programs and the computer... -
The culprit - A new to me Denon AVR-S740H. Protection history shows 60 instances of thermal detector (A) shutdown.
Powering it up for a few minutes and it gets noticeably warm on the bottom of the case where the +12, -12, +5 voltage regulators are. After 20 minutes I would call it hot, and approaching too hot to keep your hand on that part of the case. So the thermal detection is doing its job and not tripping erroneously.
The heat is clearly coming from the small voltage regulators that use the case as a heat sink. It has a bridge rectifier that converts the AC...
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