Re: What is a CSN60?
Spot on, Chris. I looked again at my notes - the only difference is that it's the LH pin 9as viewed from the bottom of the device) which is grounded via a 2 ohm resistor. The centre pin is connected to the transformer primary, and th e RH pin to a SMD IC via a 10 ohm resistor. I'll check the data sheet of the CS1N60 to confirm things, but, from the above, the LH pin is the source, centre pin the drain and RH pin the gate. If I'm right, the readings I obtained in post #1 are between Gate & Drain, which may indicate an internal diode conneceted between gate & Drain, but for what purpose? A diode connected across the Tx primary I could understand as it would protect the FET against the effects of back EMF. Paul, if you could take some measurements with a "N60 and post them here it might be helpful. Thanks in advance.
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