# Using a signal generator and power amp to supply >>240VAC to a coil

On Lenz's law, Wikipedia says:

Faraday's law states that the EMF is also given by the rate of change of the magnetic flux where epsilon is the electromotive force (EMF) and $$\\phi_B\$$ is the magnetic flux.

$$\varepsilon = - \frac{-d \phi_B}{dt}$$

I want to produce this effect very strongly in a small coil (1cm^2 cross section max of the coil) for my project. It's not possible to have massive current carrying wires in a big coil using 240VAC from mains, and I don't want to start a fire either - so I'm thinking trying using a power amplifier such as OPA547T to amplify a very high HZ (e.g. 10MHz) signal from a signal generator (JDS-2900) using only a small current (e.g. 0.5A).

My electronics is pretty basic though, so was wondering if this is a viable and safe solution? Also is the OPA574T capable of this, or do I need to look for an amplifier with different characteristics in some way? Many thanks

• The OPA547 can only produce 0.5 amps and virtually nothing at 10 MHz. It's maximum supply voltage is 60 volts too. Commented Oct 5, 2021 at 11:31
• @Andyaka Thanks - can you explain a bit more how you know that? What amp characteristic do I need to look for to get this to work? Commented Oct 5, 2021 at 11:33
• You read the data sheet: ti.com/lit/ds/sbos056f/… Commented Oct 5, 2021 at 11:33
• Maybe look at the schematics for a Metcal soldering iron. It pumps 50+ Watts at 13.56MHz Commented Oct 5, 2021 at 11:34