Schematic supply connetion, 5V or 9V? - Electronic Circuits Projects Diagrams Free

Johnson777717 · 18th August 2004, 07:08 PM

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!

red4925 · 18th August 2004, 07:36 PM

Check and see what kind of supply voltage those NAND gates require.

Roff · 18th August 2004, 07:49 PM

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

**Nigel Goodwin** · 18th August 2004, 11:23 PM

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 · 18th August 2004, 11:42 PM

Quote:

It looks like the Weeder frequency counter?

BINGO! Mr. Goodwin gets the cookie

Quote:

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!

ops:

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

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18th August 2004, 07:36 PM	(permalink)
red4925	Check and see what kind of supply voltage those NAND gates require.

18th August 2004, 07:49 PM	(permalink)
Roff	74HC logic definitely requires 5 volts, and will not work (permanently) on 9v.

18th August 2004, 11:23 PM	(permalink)
Nigel Goodwin	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!. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk