Low Voltage Suppression

Can you afford to lose some of the 12V? A source follower made from a power MOSFET can make physically small parts filter quite low frequencies. A 10V regulator would also work.

Also, try putting a capacitor right on or near the fans electrical connections. You want to provide a low impedance path for the spikes that doesn't go near the small signal paths.

Don't supress the noise, slow it down with enough capacitance and then regulate it out by running the sensitive circuitry off of a lower voltage (say 8VDC).

Best regards, Spehro Pefhany

IIRC..ittty biity spikes are not controlled by transient suppressors. An ideal zener might..but doesn't exist.

Heres some ideas...

• series regulator with high PSRR
• shunt regulator
• inductor
• capacitor
• Replace the fan with heat sinking or make a cooler design.
• Make the electronics more noise immune

try this:

Bye. Jasen

Anyone who would ask a question like that has no business posting to SED or even touching anything electronic...

Yeah...it's a lame Q but how about this for the hot shot designers..

Can the ideal zener be created? And would it be useful?

I propose this recipe:

It's basically just a super fast version of a TL431.

World's fastest transistor: (old article)

If everything is fast enough...it could clip slow spikes. A programmable TVS circuit! D from BC