Re: Ignition coil (anti-parallel pairs) array and other questions
> 3)I have just finished making a control panel and case for my TC.
> the cap, RSG and NST. I have bought an old volt and ampmeter (both
> analogue). Only problem is they are both for dc. The voltmeter is up to
> Volts and ampmeter up to 3 amps. How do I convert them to ac (240 volts
> mains here) (and changing the scale the ampmeter uses (want to be able to
> read larger currents?)), if is is possible??
For the Voltmeter: Hook up a bridge rectifier (to turn AC into DC) and a
suitable filter capacitor ( a few uF will do) across the meter. Then,
you'll have to put a series resistor in series with the meter to adjust the
range. Does the meter have any markings indicating what it's full scale
current is? (Typically something like 1 mA, or 50 uA)
For the Ammeter: You need to put a small value, high current resistor in
parallel with the meter to adjust the range. The value depends on the
resistance of the ammeter. You'll also need to put a bridge rectifier and
filter cap on.