they work as expected but i have several questions on how i can modify them to suit my needs.
for the first link:
how can i modify the meter circuit so that it deflects half-scale at about 10ohms esr? (the circuit deflects about 80% of the scale with 10 ohms at its probes).
for the the second link:
how can i modify the circuit so that it can drive a 250uA meter?(it works ok on 50uA).
ok, i reduced r17 down to a few hundred ohms and even shorting it out completely, i only got about 50% deflection even after adjusting the series pot. any other ideas? thanks!