Analog Period Detector

Phsssttt...(spits out coffee...) omg! There's a dsp in the PIC now... fkn new shit coming out all the time!!.. I don't know anything anymore...

If I was a wiz at programming, yeah...I'd go PIC but I'm out of practice.. My programmer has lots of dust on it.. D from BC

I had to look up the 4051..

I'm not sure if I got this...

So a 8 to 1 analog demux creates a single Vref from one of eight Vref's. The window comparator uses the Vref(xof8) to see if there's a match.

My guess is that 8 points are tested along the waveform to check for anything different than expected..

The 4017 acts as a "pass" test point counter.. 8 "passes" and the wave match's. Green light.. Any failed points and the counter is reset. No green light..

D from BC

I don't know why I though this was going to be a SPAM ad for tampons.

Eight different static voltages - presumably set up by eight 19mm 15- turn trimming potentiometers - selected one after the other by the

4051.

If you got for one of the 19mm potentiometers that has a transparent top, the positions of the wipers will provide the visual equivalent of a coarse scope display. Farnell stocks the Bourns 3006P-7 (the order code for the 10k version is 935-2295 and they cost about $2 each in small quantities).

-- Bill Sloman, Nijmegen

Yes, perhaps with a bit of smoothing.

Actually that active sense is mismatch but I'm sure youve got it.

Yes it would test for distortion and if the PLL isn't locked, it would also give an indication.

Its 10 passes, not 8 but other than that spot on.

Ok then,, Do as I did once, pass the signal through Flip Flop to get a clean square wave. Use this signal to synchronize a 555 one shot timer. Use the ending cycle along with the in coming square wave to drive a gate which will give you a +/- pulse to make adjustments. Of course, this could be done very simply in a PIC/AVR mini also.

--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

I thought they were last millennium?

--
Service to my country? Been there, Done that, and I\'ve got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

Heck, use a small 32-bit ARM. PICs and AVRs are so last century.

Best regards, Spehro Pefhany

--
"it\'s the network..."                          "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

No, No, No. A 4004, a PIC is to complex / powerful for that task.

--
 JosephKK
 Gegen dummheit kampfen die Gotter Selbst, vergebens.  
  --Schiller

4004??? Intel's first MPU from 1971 with a clock of 108khz?? Ha ha ....funny.... :P

I've come up with a new design with 2 D FF's and 2 op amps. It'll be a 2 IC project. I might squish it down to a PIC someday.. D from BC

Get someone to make you a chip with two op-amps and two flip-flops.