Thanks, but I already have those current transformers, and I actually have to monitor only a single line. As far as I know, just a simple amplifier with rectifier & integrator should be enough in analog part, built on two-channel op amp. TLC272, for single sided power. Then feed the output to a PIC which could do the rest. Even integrating could be done in software, if ADC is fast enough, but I have two opamp channels anyway. On Sat, Jan 19, 2013 at 11:45 PM, Carl Denk wrote: > Oh, I caught transformer and toroid, and not amperage. Afraid my > hobbyist background can't be of much help. But in particular if you will > have more than a few of these close together, that chip sounds good. A > pair of pigtails, connector, or screw terminals in and out. The sparkfun > board looks nice, there are some interesting comments there. Depending > what the rest of the project looks like, might just get chips, and mount > them on one PCB with ADC, CPU, display, etc. > > On 1/19/13 4:11 PM, IVP wrote: >>> There was an article in Circuit Cellar (or maybe it was Nuts & Volts) a >>> few years back, using a Toroid with a few wraps of the 120volt load >> I'm looking at making an isolated ammeter using the ACS712 >> and an LM358 >> >> http://www.allegromicro.com/Products/Current-Sensor-ICs/Zero-To-Fifty-Am= p-Integrated-Conductor-Sensor-ICs/ACS712.aspx >> >> The ACS712 range has 3 versions, +/-5A, +/-20A, +/-30A >> >> https://www.sparkfun.com/products/8882 >> >> Joe >> > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 KPL --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .