Building The G4JCP PIC AC MiIlivoltmeter

摘要

Measuring low 'd.c' voltages is relatively easy these days, with the 200mV range found on most multimeters being sufficiently sensitive for most applications. The same cannot be said when measuring low 'a.c' voltages as that requires either an oscilloscope or a specialist instrument. Clearly, a specialist instrument is easier to use. Being able to measure a.c. voltages in the millivolt range is useful, but in most cases, not worth the cost of buying a commercial meter. So here's a low cost, home-brew alternative which has sufficient accuracy to make it a useful addition to the shack.