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Old 06-12-2011, 03:59 AM
Farmhand Farmhand is offline
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Join Date: Jun 2010
Location: Australia
Posts: 3,389
OK so this is the circuit I am using now to excite the transmitter.

I think i drew it correctly, maybe Cody could check it for me. The small cap I added to the variable cap is marked 682 so I think that is 6800pf and the variable cap is 40 to 1300 pf. I will get an acurate frequency and PW measurement, when I can, the switching waveform is very poor with the mosfet driver i have on this board there are resistors on the mosfet gate. So this could work much better with vertical switching waveforms. The switch trace is so bad there is not even one straight edge to it. This mosfet has been abused badly. I'll try the other fet. then add a turn off sharpener for now instead of the resistors.

It should look like this, But it doesn't.

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