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Re: Need help with this circuit diagram
The barrel on the jack will probably just unscrew.
Yes, you will need to buy the diode.
If you look at the specification of the relay, you will note that it is a 5 VDC one.
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Lest we forget...
"They shall grow not old, as we that are left grow old;
Age shall not weary them, nor the years condemn.
At the going down of the sun and in the morning
We will remember them."
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