Quote:
Originally Posted by gary
Hi Ken,
Strictly speaking, according to the NatSemi datasheet, neither capacitor is required
for the regulator to operate. However, the datasheet recommends a 0.22uF on the
input "if the regulator is located far from the power supply filter", which in your case,
is unlikely and "although no output capacitor is needed for stability" one "does
help transient response" and they recommend a 0.1uF ceramic capacitor.
See http://www.national.com/ds/LM/LM340.pdf
You will certainly have to be careful with any noise from the fan and in any case,
always using capacitors represents good practice. Use a 0.22uF tag tantalum of appropriate
voltage rating and low ESR on the input. |
Thanks Gary.
All I have is two 470uf and a few 1000uf Electrolytic Capacitors I can get out of an old dead PC I have.
I don't have any Ceramic ones (the 0.1uf & 0.22uf ones).
Quote:
Originally Posted by gary
You will certainly have to be careful with any noise from the fan
|
The fan is going into the camera to blow cold air onto the front PCB to help reduce noise. I hope I don't introduce more.