Re: 12 V for home-brew IR receiver

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The 7805 voltage regulator drops any supplied input voltage to 5V. The 7805
has a maximum voltage of around 25V. The drawback of using higher voltages
is that the 7805 needs to drop/lower the voltage more, it does so through
heat. The higher the voltage you use the more heat will need to be
dissipated by the 7805. However, the heat generated is also proportional to
the amount of current or power being used, and in this case the IR diode
draws a small amount. As such I would say 12V is safe to use, worst case
add a small heatsink to the 7805 Regulator.

On Tue, Mar 25, 2025 at 12:26=E2=80=AFPM Eduard Refinius via LIRC-list <
[email protected]> wrote:

> Hello.
>
> I have a home-brew IR receiver as described on
> https://lirc.org/receivers.html
>
> I've read, that supply voltage range 8 V .. 10 V is ok for this circuit.
> Is it ok for the voltage regulator to be supplied by 12 V or is it too
> much? I don't want to damage the IR receiver.
>
>
>

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<div dir=3D"ltr">The 7805 voltage regulator drops any supplied input voltag=
e to 5V. The 7805 has a maximum voltage of around 25V. The drawback of usin=
g higher voltages is that the 7805 needs to drop/lower the voltage more, it=
 does so through heat. The higher the voltage you use the more heat will ne=
ed to be dissipated=C2=A0by the 7805. However, the heat generated is also p=
roportional to the amount of current or power being used, and in this case =
the IR diode draws a small amount. As such I would say 12V is safe to use, =
worst case add a small heatsink to the 7805 Regulator.</div><br><div class=
=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr=
">On Tue, Mar 25, 2025 at 12:26=E2=80=AFPM Eduard Refinius via LIRC-list &l=
t;<a href=3D"mailto:[email protected]">[email protected]=
forge.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex">Hello.<br>
<br>
I have a home-brew IR receiver as described on<br>
<a href=3D"https://lirc.org/receivers.html" rel=3D"noreferrer" target=3D"_b=
lank">https://lirc.org/receivers.html</a><br>
<br>
I&#39;ve read, that supply voltage range 8 V .. 10 V is ok for this circuit=
.<br>
Is it ok for the voltage regulator to be supplied by 12 V or is it too<br>
much? I don&#39;t want to damage the IR receiver.<br>
<br>
<br>
</blockquote></div>

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