Conn tuner
On 5/20/2019 7:08 AM, geoff wrote:
Anybody know the power/current consumption of an ST-11
Like anyone else who doesn't have one and an ammeter, I don't know. But
I'll remind you that it's a synchronous motor that makes it work, so the
accuracy of the 60 Hz is of utmost importance if you actually intend to
tune with it and not just show it off to your buddies.
When you get it, hook up an oscillator (at 60 Hz, of course) to a power
amplifier, and connect the tuner to the amplifier output through a
backwards filament transformer. Bring up the gain slowly while
monitoring the voltage to the tuner, and when it reads 115 or 120 volts,
measure the current.
I have a friend who's into aircraft instruments, most of which run on
400 Hz AC. He's set up a similar osciallator-amplifier-transformer rig
to play with his toys.
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