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Chip Amps Amplifiers based on integrated circuits

My_Ref Fremen Edition - Build thread and tutorial
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Old 16th September 2019, 06:57 AM   #4191
freegianmaria is offline freegianmaria  Italy
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Join Date: Feb 2013
Hi all.
I Need 12v inside the case of my amp My_ref to power a low noise fan: can i obtain It directory from the board? Where?
If It Is no possible can you suggest a soluzioni?
Thank you vert much for the help.
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Old 16th September 2019, 12:01 PM   #4192
phase is online now phase  United States
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I would suggest a separate transformer, and also to use a 12v fan at 5v, using a 7805 regulator, to reduce noise.
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Old 16th September 2019, 12:13 PM   #4193
Joseph K is offline Joseph K  Hungary
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I concur. Do not use, please, the local regulators for anything else..
The small transformer & regulator works very well, out friend is using like that to great effect.
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Old 16th September 2019, 01:23 PM   #4194
lehmanhill is offline lehmanhill  United States
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+1

In the past, I have powered a separate opamp circuit requiring only a few mA stolen from the FE board. When I changed to a higher current opamp, the FE regulated power became erratic and may have oscillated. So stealing power from the FE is not a good idea from a noise stand point, but also from a power available stand point.

The nice thing is that the fan doesn't require a fancy power supply.

Good luck.

Jac
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Old 16th September 2019, 03:10 PM   #4195
freegianmaria is offline freegianmaria  Italy
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Ok, It seems that best solution Is 5v fan (low noise) with dedicated power supply. Right?
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Old 17th September 2019, 02:43 AM   #4196
Panelhead is offline Panelhead
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Also the small signal regulator circuit does not react well to a high capacitance on the output.
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Old 17th September 2019, 05:39 AM   #4197
giupo is offline giupo  Italy
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Quote:
Originally Posted by freegianmaria View Post
Ok, It seems that best solution Is 5v fan (low noise) with dedicated power supply. Right?
Are you sure that you need a fan? A reasonable heat sink is enough for the circuit.
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