555 as a PLL? - Page 3 - Electronic Circuits Projects Diagrams Free

**Nigel Goodwin** · 20th December 2005, 02:22 PM

As previously mentioned you want an NE567 tone detector PLL IC - simple to use, and does just what you need.

mstechca · 21st December 2005, 01:08 AM

Quote:

Originally Posted by Nigel Goodwin

As previously mentioned you want an NE567 tone detector PLL IC - simple to use, and does just what you need.

I'll try it then. thanks.

Russlk · 21st December 2005, 02:18 AM

You will need several 567s to cover the range. I worked up a design using the CD4046, it takes 3 circuits to cover the range of 1 hz to 1kHz. If you build it, please let me know how well it works. Oops I forgot, use a coupling capacitor to pin 14 unless the signal is logic level.

akg · 21st December 2005, 05:39 AM

i was wondering that, is (s)he is trying to cover the entire range of 1hz to 1K using PLL(s)!!

**Nigel Goodwin** · 21st December 2005, 08:12 AM

Quote:

Originally Posted by akg

i was wondering that, is (s)he is trying to cover the entire range of 1hz to 1K using PLL(s)!!

No, he's only wanting to detect a single frequency, either ON or OFF, the (rather silly) range he specified was only so he could try for the optimum frequency.

akg · 21st December 2005, 08:28 AM

hmmm....

" You will need several 567s to cover the range. I worked up a design using the CD4046, it takes 3 circuits to cover the range of 1 hz to 1kHz. ""..

this comment inspired me to think like that..

Gaddy · 2nd June 2008, 03:01 PM

yes you can make a pll with a 555, but i doubt that in the frec that you want to, thas was my first desing of pll, a xor gate, a low pass, an amplifier, an that was done, i was quite amazed, was in lock even when they have differen duty cycles, in this case you may do it, digitally, with a rate of meassure, with a computer, example if you want to buil a tacometer.

Gaddy Alcalà

Gaddy · 2nd June 2008, 03:04 PM

with a PIC, maybe 1hz is too much

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20th December 2005, 02:22 PM	(permalink)
Nigel Goodwin	As previously mentioned you want an NE567 tone detector PLL IC - simple to use, and does just what you need. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

21st December 2005, 05:39 AM	(permalink)
akg	i was wondering that, is (s)he is trying to cover the entire range of 1hz to 1K using PLL(s)!!

21st December 2005, 08:28 AM	(permalink)
akg	hmmm.... " You will need several 567s to cover the range. I worked up a design using the CD4046, it takes 3 circuits to cover the range of 1 hz to 1kHz. "".. this comment inspired me to think like that..

2nd June 2008, 03:01 PM	(permalink)
Gaddy	It is possible yes you can make a pll with a 555, but i doubt that in the frec that you want to, thas was my first desing of pll, a xor gate, a low pass, an amplifier, an that was done, i was quite amazed, was in lock even when they have differen duty cycles, in this case you may do it, digitally, with a rate of meassure, with a computer, example if you want to buil a tacometer. Gaddy Alcalà

2nd June 2008, 03:04 PM	(permalink)
Gaddy	with a PIC, maybe 1hz is too much