Thanks to Colin for the idea. Dad built it for me. It uses 6 LM317 voltage regulators.
Each LM317 has its own pot (the metal knob on the bottom of the panel (though in that picture its still knobless)). The switches are DPDT (two poles - one for the fan power, another for the LEDs). switch all the way down is the regulated power, switch middle is off, switch up is full 12V from the power supply. The LEDs switch from red -> off -> green respectively.
A top view showing the fan output jacks and the row of heatsinked LM317's.
A view from the side. I found this nifty tray at Dad's office. It used to hold a hot-swapable tape drive or something.
I couldn't find an onboard molex power connector anywhere, so it's just got a wire. most of the stuff came from the local Active Electronics, except for the switches, which were a cheap $1.30 each at www.allelectronics.com, and the LEDs which I couldn't find locally.
Each LM317 has its own pot (the metal knob on the bottom of the panel (though in that picture its still knobless)). The switches are DPDT (two poles - one for the fan power, another for the LEDs). switch all the way down is the regulated power, switch middle is off, switch up is full 12V from the power supply. The LEDs switch from red -> off -> green respectively.
A top view showing the fan output jacks and the row of heatsinked LM317's.
A view from the side. I found this nifty tray at Dad's office. It used to hold a hot-swapable tape drive or something.
I couldn't find an onboard molex power connector anywhere, so it's just got a wire. most of the stuff came from the local Active Electronics, except for the switches, which were a cheap $1.30 each at www.allelectronics.com, and the LEDs which I couldn't find locally.