Hi all,
I just builded the k8095 mp3 kit and it works well but I am worried about the temperature from the volt regulators and the stereo amplifier.
I can not hold the volt regulators between my fingers.
The kit needs to run, soon, for 1 month non stop for an art project.
Is it a good reason to be worried about?
Regards,
Pown
[quote]Is it a good reason to be worried about? [/quote]I think there is no need to be worried. It is normal that these components are warm. There is internal thermal shut down to protect the circuits if the temperature is too high.
Thanks for your quick answer.
I just wonder what happens if a power supply from 5 volt will be used?
Does this mean that the voltage regulators becomes less hot because of the smaller range to regulate?
I have a small mp3 player running for hours on a 1.5V battery.
Why can I cook an egg on the kit when the are doing exactly the same?
Imagine I have 2 power supplies, 3.3V and 5V and I will take the regulators off, is the kit working and using less power?
I am not even a electronics newbie so, I am sorry for too stupid questions.
Regards,
Pown
[quote]I just wonder what happens if a power supply from 5 volt will be used?
Does this mean that the voltage regulators becomes less hot because of the smaller range to regulate?[/quote]You are right. The regulators have now to drop the 12V input voltage to 5V and 3.3V. The dissipation is P=I*(Vin-Vout). You can’t use only 5V input voltage. The power amplifier IC2 requires 12V to operate properly.
[quote]I have a small mp3 player running for hours on a 1.5V battery.
Why can I cook an egg on the kit when the are doing exactly the same?[/quote]The answer is that we need the 12V supply for the power amplifier of the K8095.
[quote]Imagine I have 2 power supplies, 3.3V and 5V and I will take the regulators off, is the kit working and using less power?[/quote]Yes. The power dissipation of the voltage regulators can be avoided in this case. You need also 12V supply for the power amplifier.
[quote]I am not even a electronics newbie so, I am sorry for too stupid questions.[/quote]These were good questions.
I made some temperature measurements:
The temperature of the regulator VR1 was 52°C and VR2 was 61°C. These both temperatures are very well on the safe area.
Hi Vel255,
Just came back from a holiday.
Thanks for your answer.
I needed to build another k8095 and it’s not working at all (no LCD).
I only use the head phone output.
I havn’t assembled:
IR-demodulator
LED’s
Buttons (only an extended button (reverse) for “start” and “back”))
What is the best way to start trouble shooting?
Problem solved…, mp3 decoder was up side down… 
Regards,
Pown
[quote=“VEL255”][quote]I just wonder what happens if a power supply from 5 volt will be used?
Does this mean that the voltage regulators becomes less hot because of the smaller range to regulate?[/quote]You are right. The regulators have now to drop the 12V input voltage to 5V and 3.3V. The dissipation is P=I*(Vin-Vout). You can’t use only 5V input voltage. The power amplifier IC2 requires 12V to operate properly.
[quote]I have a small mp3 player running for hours on a 1.5V battery.
Why can I cook an egg on the kit when the are doing exactly the same?[/quote]The answer is that we need the 12V supply for the power amplifier of the K8095.
[quote]Imagine I have 2 power supplies, 3.3V and 5V and I will take the regulators off, is the kit working and using less power?[/quote]Yes. The power dissipation of the voltage regulators can be avoided in this case. You need also 12V supply for the power amplifier.
[quote]I am not even a electronics newbie so, I am sorry for too stupid questions.[/quote]These were good questions.
I made some temperature measurements:
The temperature of the regulator VR1 was 52°C and VR2 was 61°C. These both temperatures are very well on the safe area.[/quote]
i have to the k8095 for a long period now, and had this issue too, compared it with other amps and found out that they all have coolsinks attached for effecient cooldown, ialready know it’s not a great risk to go without a sink,’ cause protected against overheat, but i didn’t took the risk, hope it may be a bit helpful…