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Voltage regulator question

J

Jerrit Tyler

Jan 1, 1970
0
I need a voltage regulator to supply a small electric DC motor with a
variable voltage of 3 to 6 volts at about a max of 5 amps, the input
side is a 14 amp, 13.8 volt DC power supply.
A search of Google found a few things that might work but not exactly,
like the LM317 but it only is rated for 1.5amps max.

Any help or plans is greatly appreciated, I have never built a power
project so I am a definate newbie.

thanks,

Jerrit
 
D

Dennis Davis

Jan 1, 1970
0
Jerrit said:
I need a voltage regulator to supply a small electric DC motor with a
variable voltage of 3 to 6 volts at about a max of 5 amps, the input
side is a 14 amp, 13.8 volt DC power supply.
A search of Google found a few things that might work but not exactly,
like the LM317 but it only is rated for 1.5amps max.

Any help or plans is greatly appreciated, I have never built a power
project so I am a definate newbie.

thanks,

Jerrit
try using a transistor follower to kick up the current on the lm317
a 2n3055 is whats generally used. I can dig up a schematic in time,but you
could probably find one quicker with google (LM317)
 
J

Jimmy

Jan 1, 1970
0
With this type of circuit your pass transistor will have to dissipate around
35 watts. I am assuming this is for some sort of motor speed control. If it
were me I would consider using an NE555 osc wired to provide a variable
pulse width output to drive a power FET.
 
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