1. The voltage followers are being used because they are there. I guess I could just use a singel op amp and wire a PNP transistor to accomplish the same thing as the quad amp and the NPN transistor. Transistors! I get so confused with them at times.
2. The R15 and R16 are there. It was like they were there and it worked and they were easier to use than cutting another wire. It's not like you need a bunch of volts to turn on a transistor.
3. I tried to clamp the voltage between the 4.7K resistor and the last op amp that inverts the voltage.
4. The LED do light up so I guess I have them drawn in like a zenor diode. In a way, that's how I'm using them.
I've got to rethink one and two above. No sense in over building the circuit.
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Andrew, Eheim Club Member #24
This message is always under construction: 75-gallon tank; 2, Eheim 2026 filters; Tek Light with 4, 54W T5s (6000K) ; Sand on top of 4:1 sand:clay mixture; Milwaukee CO2 controller; PlantGuild vortex CO2 reactor; pH = 6.6, kH=70mg/l, GH=120mg/l; EI; Flourish excel on 50% weekly water change: AGA Member.
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