Wisdom states that the load is connected to the drain, and the source connected to pos or 0v dependant on P or N channel. However ...
I have a "2N3820" (a p-channel in TO92 package), so pin out (should) be DGS with the flat facing upwards.
If I connect in the correct configration as shown, I get weird results.
Those readings don't seem right BUT ... if I put the load on the source pin, and ground the drain
So I wondered if the pinout was 'non-standard' (cheapo from ebay) so, using a diode tester on multimeter, and a continuity tester, I got the following results:
D-S reads 730 on my meter (a normal IN4001 also reads 730) S-D reads 688 (Don't ask what those figures relate too - I've no idea either!)
With neg of audio contin0uity tester to drain, + to source audio signal neg to drain, + to gate: no audio pos to drain, - to source: audio pos to drain, - to gate: audio
(The continuity tester, built to mainly test for broken leads is simply a 555 astable, but with a break between the neg of circuit board, and -ve of battery
I have NO IDEA how to interpret those results to find the correct pin config.
The second arrangement is what I want to happen, ie to be normally conducting when gate low, but switch off when gate taken high. But the pinout seems to go against all the diagrams I've seen where the load should be between drain and 0v.
Can anyone explain - IN SIMPLE TERMS (!) - what the heck is going on here. 'cos I'm totally bewildered