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Borbely DC 100 Amp: Left Channel Troubleshooting
Borbely DC 100 Amp: Left Channel Troubleshooting
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Old 29th June 2018, 06:20 AM   #111
Mooly is offline Mooly  United Kingdom
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Borbely DC 100 Amp: Left Channel Troubleshooting
Not exactly

The Source has to go to the PSU positive terminal.

The Drain and its 100 ohm go the negative terminal. You also now measure ALL voltages from the positive terminal which becomes our reference point. That means you will see a variable negative voltage on the Drain as you alter your supply. So as before, we set it to around 9 volts.

The gate voltage has to be variable with respect to that positive terminal.

Another way to do it would be to use a fixed 9 volt battery for the main power supply. Battery plus to Source, battery negative to drain.

You could now connect the plus output of the power supply to the battery plus and the negative of the power supply via the 1meg to the gate. That should give you a variable gate voltage. Again all voltages are measured from the battery plus terminal.

If you do that then only connect the battery once the gate has been wired up. Leaving the gate floating (on a good fet) will almsot certainly turn the fet on and with a tiny 9 volt battery and 100 ohm load it will soon pull the voltage down.
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Old 29th June 2018, 12:38 PM   #112
dbxdx5 is offline dbxdx5
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I think you were being kind with "Not exactly."
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Old 29th June 2018, 01:53 PM   #113
Mooly is offline Mooly  United Kingdom
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Borbely DC 100 Amp: Left Channel Troubleshooting
well, you know how it is

Juggling polarities mentally isn't easy at first, and I remember how it took me a while to grasp the basics of it. And FET's were even harder to grasp somehow.
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