Help needed - counter circuit - Electronic Circuits Projects Diagrams Free

circuitfish · 8th July 2009, 11:30 AM

I've built the circuit below. Unfortunatly, the fuse on my voltmeter has been blown by a numpty (aka me). I was wondering if anyone could tell me how v out would change over 20 seconds or so.

Any help would be much appreciated,
Thanks.

ericgibbs · 8th July 2009, 12:05 PM

Quote:

Originally Posted by circuitfish

I've built the circuit below. Unfortunatly, the fuse on my voltmeter has been blown by a numpty (aka me). I was wondering if anyone could tell me how v out would change over 20 seconds or so.

Any help would be much appreciated,
Thanks.

As its 16 bit divide, the counter would rollover to a count of 4, after 20sec, so the Vout = [4/15] * Vref.

thats about 0.333 *4 = 1.33V

ericgibbs · 8th July 2009, 12:31 PM

hi,
Look at this sim of your circuit, you can see that bit Q3 is high after 20secs

Have you tried to replace the blown fuse in your meter.??

circuitfish · 8th July 2009, 01:33 PM

Thanks, I will be replacing the fuse, yes, but I'm on a bit of a tight schedule.

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8th July 2009, 11:30 AM	#1
circuitfish	Help needed - counter circuit I've built the circuit below. Unfortunatly, the fuse on my voltmeter has been blown by a numpty (aka me). I was wondering if anyone could tell me how v out would change over 20 seconds or so. Any help would be much appreciated, Thanks.

8th July 2009, 12:31 PM	#3
ericgibbs	hi, Look at this sim of your circuit, you can see that bit Q3 is high after 20secs Have you tried to replace the blown fuse in your meter.?? Attached Thumbnails __________________ Eric " Good enough is Perfect " I will NOT answer PM's requesting technical help, please use the Forum PIC tutorials: Nigel's www.winpicprog.co.uk/ Bill's: www.blueroomelectronics.com/

8th July 2009, 01:33 PM	#4
circuitfish	Thanks, I will be replacing the fuse, yes, but I'm on a bit of a tight schedule.