The Planted Tank Forum - View Single Post - DIY pH Contorller

g8wayg8r · 02-12-2008, 11:16 PM

The purpose is never to save money or time. This was a learning exercise for me. I now have a spreadsheet that I can input resistor values and make all of my gain and summing addition calculations.

I assembled and had the project that guy on yoru link based his design on. The advantage of his approach is that it gives you the correct ph on the display with no negative DC. I'm at the amp part of the circuit now and I'm having trouble with the reference ground working for some reason. I have no clue why. I've also discovered the reason why a Fluke RMS meter cost a bunch more than the little $10 POS multimeter I bought online. That meter and an oscilloscope really opened my eyes.

02-12-2008, 11:16 PM	#12 (permalink)
g8wayg8r Planted Tank Enthusiast (View User Tanks) PTrader: (0/0%) Join Date: Dec 2003 Location: St Charles, MO Posts: 516	The purpose is never to save money or time. This was a learning exercise for me. I now have a spreadsheet that I can input resistor values and make all of my gain and summing addition calculations. I assembled and had the project that guy on yoru link based his design on. The advantage of his approach is that it gives you the correct ph on the display with no negative DC. I'm at the amp part of the circuit now and I'm having trouble with the reference ground working for some reason. I have no clue why. I've also discovered the reason why a Fluke RMS meter cost a bunch more than the little $10 POS multimeter I bought online. That meter and an oscilloscope really opened my eyes. __________________ 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.