Re: Whats this guy up to?

[Admin]

You can get this cap at Radio shack 100 mf.

Thanks Steveg. You’re probably right. I just assumed it was voltage regulated since the cheapest DC motor control that uses pulses that I’ve seen is $80. Of course those are for 1/16 hp motors too. But you’re right, pulses to control DC motors is the best way to go. Lower RPM with same torque ratings. I would have to hook up my o-scope to determine if those pulses were there since the voltmeter will probably show a lower RMS voltage instead of pulses.

b_drift. Current is directly proportional to voltage. When voltage drops, amprage drops. Completely linear equation V=IR (Voltage = Current X Resistance) The cap in cars keeps the voltage up, which any size cap would do but they use large capacities like 1 farad (in my car) to keep the voltage up longer when current is drawn. A.1 farad would keep the voltage up but as soon as the amp took a lot of current (bass note) the cap would give it all the current it had which would only be a fraction of a seconds worth. Then the voltage would decrease since the cap has no more stored energy until the bass note is gone and it can recharge. The 1 farad cap is large and keeps the voltage up throughout the entire bass note and then recharges when there’s no base. It’s just kind of a buffer.

-Peter

-Peter