Quote:
Originally Posted by Herald1360
I think it's more likely because the 1N4007 will have the highest Vf of the group. You don't want the clamp turning on too soon.
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I've tested some diodes with If of 5mA to 20mA. The 1N4007 has different construction to the other 1N400x. It's got the higher Vf needed. It also makes a cheap RF attenuator or switch because it's MUCH slower to switch than the others, behaves like a PIN diode. It also means that with high capacitive load it doesn't need the snubber capacitors you sometimes see on bridges to minimise RFI from the current spikes. It's too poor a Q to use as a VHF varicap, but it will work as a varicap for AFC (LW to SW) or tuning bandspreaded SW tuning. Too small a change for MW/LW.