mechanical quartz clock schematic - Electronic Circuits Projects Diagrams Free

bdcroucher · 20th October 2006, 08:28 PM

Does anyone have a schematic or plan for a quartz clock circuit. Got the mechanics, just need circuit to drive the stepper. thx Bill

Hero999 · 21st October 2006, 09:16 PM

What sort of stepper motor are you using?

A normal stepper motor control circuit should work but you need to drive it from a crystal oscillator.

Tarsil · 21st October 2006, 09:30 PM

Use a PIC steper controler and put it to give 60 sgn/s. Or u can design a 555 based cicuit.

Hero999 · 21st October 2006, 09:42 PM

A pic might do providing the crystal oscillator is acurate enough, but a 555 timer certainly isn't. The timing capacitor will have a tollerance of 10% before we even consider the long term stability.

Tarsil · 21st October 2006, 10:00 PM

Quote:

Originally Posted by Hero999

A pic might do providing the crystal oscillator is acurate enough, but a 555 timer certainly isn't. The timing capacitor will have a tollerance of 10% before we even consider the long term stability.

I know the 555 timer is crapy but it's quite ok for a DIY project. It wont require a programer and some know how about PIC's. Older cheap quartz clocks (70') used 1 transistor oscilator and a simple motor with some gearing.

Hero999 · 21st October 2006, 10:15 PM

He could a CMOS 2Hz CD4060 oscillator using a 32768kHz watch crystal.

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20th October 2006, 08:28 PM	(permalink)
bdcroucher	mechanical quartz clock schematic Does anyone have a schematic or plan for a quartz clock circuit. Got the mechanics, just need circuit to drive the stepper. thx Bill

21st October 2006, 09:16 PM	(permalink)
Hero999	What sort of stepper motor are you using? A normal stepper motor control circuit should work but you need to drive it from a crystal oscillator. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez And http://www.silicontronics.com, same screen name as here.

21st October 2006, 09:30 PM	(permalink)
Tarsil	Use a PIC steper controler and put it to give 60 sgn/s. Or u can design a 555 based cicuit. __________________ If is too complicated.....most of the times is the wrong way.

21st October 2006, 09:42 PM	(permalink)
Hero999	A pic might do providing the crystal oscillator is acurate enough, but a 555 timer certainly isn't. The timing capacitor will have a tollerance of 10% before we even consider the long term stability. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez And http://www.silicontronics.com, same screen name as here.

21st October 2006, 10:15 PM	(permalink)
Hero999	He could a CMOS 2Hz CD4060 oscillator using a 32768kHz watch crystal. __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez And http://www.silicontronics.com, same screen name as here.