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Schematic supply connetion, 5V or 9V?

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Johnson777717

New Member
Good day folks!

Would you mind helping me to determine the unknown connection in this circuit? I believe this is a 9V connection, but I'm not sure, it could be a 5V connection?

Please see the arrow pointing upwards at the top-middle of the schematic between C6 & R6. Thank you for your help!
 

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Roff

Well-Known Member
74HC logic definitely requires 5 volts, and will not work (permanently) on 9v.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
It looks like the Weeder frequency counter?, it works off 9V but has a 5V regulator on board for feeding the PIC, LCD and TTL. The front end FET's are fed from the 9V supply though!.
 

Johnson777717

New Member
It looks like the Weeder frequency counter?
BINGO! Mr. Goodwin gets the cookie :D

74HC logic definitely requires 5 volts, and will not work (permanently) on 9v.
Yeah, I got to looking at the schematic during my lunch break at work and came to that realization! Doh! :oops:

Thanks for your help folks, sorry to waste your time.
 
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