Electronics > Beginners

Loud Speaker?

<< < (17/18) > >>

ChrisGreece52:

--- Quote from: madires on June 02, 2013, 07:14:21 pm ---
--- Quote from: mariush on June 02, 2013, 06:57:09 pm ---You just have to know that the metal back of the chip is connected to what would be -15v on your power supply.  Traditionally, circuit boards are grounded to what they're screwed on (ex on motherboards ground in the connector coming from the psu is connected to the metal case through the screws sometimes) so if you do that and the metal heatsink touches the metal case you have a short circuit.
If you put the prototyping board and the heatsink in a plastic box (abs) the heatsink is basically not touching or shorting anything, so you don't need insulation. And if you touch it with your hand, at best you're going to feel some tingling in your fingers and the chip may reset or make awful noise (you're may short the -vs to ground through the big resistor your body forms)

--- End quote ---

I'd suggest to mount the TDA isolated if the heatsink isn't inside any non-conducting box to prevent trouble with the input signals. Putting a 15W heater inside a closed plastic box isn't a good idea IMHO. The best way is to place the heatsink at the backside of the speaker box for proper air convection.

--- End quote ---
Ill think of installing 2 small 40mm fans so they keep the box cold

mariush:
No need for that man.

Just drill some holes in the case where the bottom of the heatsink should be, and some holes towards the top, somewhere above the heatsink.
Hot air tends to rise up, so colder air will be sucked in through the holes at the bottom and the warm air will get out through the holes at the top ... it's called natural convection : https://en.wikipedia.org/wiki/Convection

If it will get really hot, get a regular 80mm - 120mm that you can find basically anywhere and put it to blow the warm air OUT of the wood box .. you can power it directly from 15v through a dropper resistor to get the fan running at 6-8 volts so that it won't be noisy.

madires:

--- Quote from: ChrisGreece52 on June 02, 2013, 09:20:59 pm ---Ill think of installing 2 small 40mm fans so they keep the box cold

--- End quote ---

Passive cooling rulez! :-)

ChrisGreece52:

--- Quote from: mariush on June 02, 2013, 09:55:49 pm ---No need for that man.

Just drill some holes in the case where the bottom of the heatsink should be, and some holes towards the top, somewhere above the heatsink.
Hot air tends to rise up, so colder air will be sucked in through the holes at the bottom and the warm air will get out through the holes at the top ... it's called natural convection : https://en.wikipedia.org/wiki/Convection

If it will get really hot, get a regular 80mm - 120mm that you can find basically anywhere and put it to blow the warm air OUT of the wood box .. you can power it directly from 15v through a dropper resistor to get the fan running at 6-8 volts so that it won't be noisy.

--- End quote ---
That would save me time thank you :D

smashedProton:
Yes, if your speakers are well made you can venture past their rated values.  But I would not do that.  Also, be sure not to clip your amplifier.  That is very bad stuff that will burn up the coil.  Remember that speakers are not ac driven heating elements.  Also, the best way to get more output is RESONANCE.  Make a ported box.  T-lines are also good because they can cause the backpressure to constructively interfere with the foreward.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod