I've created a second power supply (the schematic attached) using a variable voltage regulator.
All works well in theory. I have a volt meter as part of the circuit, and it's reading goes up and down as I turn the pot. I also have an ammeter connected.
However, there is a really fundamental problem that I have overlooked somewhere. When I attach a small DC motor to the output, the voltage drops to zero, and the current goes up a little.
There must be some really simple principle or law I'm overlooking, but I'm not that experienced, so I can't see what it is.
PS, I didn't have this problem with a fixed voltage, using a 7809 regulator that I posted in a previous thread.
Thanks anyone who can enlighten me on this...
All works well in theory. I have a volt meter as part of the circuit, and it's reading goes up and down as I turn the pot. I also have an ammeter connected.
However, there is a really fundamental problem that I have overlooked somewhere. When I attach a small DC motor to the output, the voltage drops to zero, and the current goes up a little.
There must be some really simple principle or law I'm overlooking, but I'm not that experienced, so I can't see what it is.
PS, I didn't have this problem with a fixed voltage, using a 7809 regulator that I posted in a previous thread.
Thanks anyone who can enlighten me on this...