Hi I would like to add a Bluetooth module to my amp my amp currently runs of a 14v DC supply. I would like to make a 5v rail to run it but have no idea how to achieve this any input is welcome thanks.
Or get a cheap cigarette lighter socket 12 V to USB SMPS converter and use it's PCB.
Best regards!
Best regards!
Is 14V the spec voltage, or measured voltage? Measured is often times higher than what is specified.
So if measured voltage is 14, then you are dropping 14-5=9v.
For a linear regulator (such as the 7805), it will have to dissipate 9v times current draw of the bluetooth module. Depending on what the current draw is, the total power may require some heatsinking of the linear reg.
There are newer technology, lower noise versions of 7805's out there, depending how much you want to spend, and how good you want this to be.
7805 is cheap and easy, and will probably handle the power, so its something you can try and see how it works/sounds.
So if measured voltage is 14, then you are dropping 14-5=9v.
For a linear regulator (such as the 7805), it will have to dissipate 9v times current draw of the bluetooth module. Depending on what the current draw is, the total power may require some heatsinking of the linear reg.
There are newer technology, lower noise versions of 7805's out there, depending how much you want to spend, and how good you want this to be.
7805 is cheap and easy, and will probably handle the power, so its something you can try and see how it works/sounds.
Surely something like this could be the easiest and cheapest option?
1pc Small LM2596 power supply module DC/DC BUCK 3A adjustable buck module regulator ultra LM2596S 24V switch 12V 5V 3V Newest-in AC/DC Adapters from Home Improvement on Aliexpress.com | Alibaba Group
I use it with my Arduino to step down from 12V to 4V.
1pc Small LM2596 power supply module DC/DC BUCK 3A adjustable buck module regulator ultra LM2596S 24V switch 12V 5V 3V Newest-in AC/DC Adapters from Home Improvement on Aliexpress.com | Alibaba Group
I use it with my Arduino to step down from 12V to 4V.
You can buy a LM317 regulator module from e-bay - should already include a small heatsink. Cost is usually peanuts.
Put a "test load" resistor of say 200 ohms on the output and adjust the voltage output to the 5v you need for your Bluetooth module, then attach the bluetooth module instead of your test load resistor and you are good to go. The LM317 regulator should have better specs than most 7805's as well.
Put a "test load" resistor of say 200 ohms on the output and adjust the voltage output to the 5v you need for your Bluetooth module, then attach the bluetooth module instead of your test load resistor and you are good to go. The LM317 regulator should have better specs than most 7805's as well.
Simple, very, very cheap, veryvcompact, robust and reliable idea - I like it!
(in-car nom '12v supply' is all over the place, usu 14.2-14.4v when running, right in the target area and these adaptors are designed for both this, and to withstand much higher spike from bus transients/alternator load dumps. This is a neat idea.)
And a good way to inject HF noise to the 14v DC rail as well. If I wanted to go that way, I personally would use a wall wart better, at least most of the switching noise would remain at the other side of the existing trafo.
Fortunately there are AC/DC small linear power supplies for very little more money. That's what I would use, If I though that noise in the 14V rail could compromise the sound quality.
cebek 5v power supply - Google Search
Regards.
Fortunately there are AC/DC small linear power supplies for very little more money. That's what I would use, If I though that noise in the 14V rail could compromise the sound quality.
cebek 5v power supply - Google Search
Regards.
If you're going to put the BT receiver in the amp case then I'd say it's going to have a pretty poor range, and if you're going to have an external receiver than you might as well power it separately too, which will circumvent the noise problem that you are inviting.
Hi yes I do get a lot of noise from the Bluetooth. I was looking in to getting one of these. MURATA NKE0505SC. Do you guys think of will do the trick.?
Certainly worth a try, but didn't work when I tried it.
No idea where the noise was coming in, but there it was.
No idea where the noise was coming in, but there it was.
Hmmm don't want to waist money on things that don't work is my only other solution a separate power source?.
*Ground Loop Alert!!*
Trying to operate multiple things from a common power supply can cause headaches! This will fix your problem..
The MURATA NKE0505SC will work but you are close to the max output, which could cause noise. Give yourself plenty of headroom..
power module dc 12v to 5v 2a single output isolated dc power supplies dc dc buck converter quality goods free shipping-in Voltage Regulators/Stabilizers from Home Improvement on Aliexpress.com | Alibaba Group
Trying to operate multiple things from a common power supply can cause headaches! This will fix your problem..
The MURATA NKE0505SC will work but you are close to the max output, which could cause noise. Give yourself plenty of headroom..
power module dc 12v to 5v 2a single output isolated dc power supplies dc dc buck converter quality goods free shipping-in Voltage Regulators/Stabilizers from Home Improvement on Aliexpress.com | Alibaba Group
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Hi would this do the same job.
Car Audio Isolated Power Supply Module Buck Converter DC 12.6~24V To ±12V Output | eBay
Car Audio Isolated Power Supply Module Buck Converter DC 12.6~24V To ±12V Output | eBay
I don't believe that this unit would be much good with the intention to operate an amp. The output is limited to 10 watts. Not much to play with..
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