Originally posted by Sputins
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I haven't tried a square wave with this setup, only briefly with the setup I used with audio modulation before, a basic 2N2222 amplifier. As I recall varying the duty basically had the effect of varying the amount of power (available at the receiving load), and under a certain pulse width the audio output became garbled.
The maximum with this new circuit will be +/- 15V. The signal generator is currently driving an op amp which is driving TIP120 and TIP125 transistors in a push-pull arrangement. A modulation stage will be added before the op amp for when amplitude modulation is needed, but I haven't started assembling that circuit yet. I intend to use sine waves because I'd like to use (undistorted) signals to experiment with, there are a lot of interesting possibilities like Tesla said. "Signals" of course being a very generic term. In basic terms I want a relatively powerful/versatile signal generator with the option of modulating the amplitude.
I think the threshold for transmission is about +/- 3-4V, but it's impossible to say really because it also depends on the receiver and the load etc. That's about what it takes when I use the original CRI design secondary to power an LED over an earthed transmission line (transmitter and receiver connected by a wire that's earthed). That using only the op amp to power the primary. Current or voltage is one of the things I want to experiment with which is why ideally I want to have independent control over both.
Combining the valves with the circuit Eric posted sounds like a good idea to me. I'd be interested to know how your power supply test goes.
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