AC millivoltmeter and signal squirt

It is often useful to be able to measure low-level audio signals. However, the lowest AC range on most multimeters is usually several volts (f .s.d .) and -to make matters worse -it presents a relatively low load impedance to the circuit under test. A `preamplifier for multimeters` can solve this problem. Since a suitable preamp should have a high input impedance and a sufficiently large bandwidth, it seems logical to use FET-input opamps. Furthermore, since a single IC contains four of these opamps it is a relatively simple matter to include a `signal squirt` on the same board.