Now that's a good idea. Why the diode?
73 de M0XDF, K3 #174
--
The soul is the same in all living creatures, although the body is
different. -Hippocrates, physician (460-c.377 BCE)
On 14 Nov 2009, at 08:31, AD6XY wrote:
My K3 12V output powers an automotive relay (+diode) which connects
When the relay solenoid's magnetic field collapses when power is removed it
will produce a sizeable reverse-polarity surge at the 12V connector. A diode
across the leads oriented to it is normally reverse polarity (anode to
ground, cathode to +) will conduct when that surge occurs and keep most of
Hello David
Why the diode? Well, any relay driven by a solid-state device should have a
diode across its coil (in reverse polarity!) to short reverse voltage
spikes. Transistor are rather fast switches... and such spikes would damage
them. Never drive a relay from a transistor or IC without such
Thanks for the report Ken, I am afraid I don't see a need for one of Rose's
covers for it. I am waiting for an uncommitted sensor so I can measure high
power at VHF and above.
Regarding powering:
My K3 12V output powers an automotive relay (+diode) which connects the 12V
PSU to an 8 way
How is the display on the computer? The LED display is fine but I really
bought the W2 (mine is on the way) to be able to use the higher resolution
display on my computer.
AD6XY wrote:
Thanks for the report Ken, I am afraid I don't see a need for one of
Rose's covers for it. I am waiting
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