If the 1kHz is *critical*, what is the tolerance? If it is within +/-5% I wouldn't even be considering a 555.
If the 1kHz is *critical*, what is the tolerance? If it is within +/-5% I wouldn't even be considering a 555.
"budgie"
** More " budgie droppings ".They may be small, but they are sure smelly and plentiful.
....... Phil
-- Vcc | C B Q1 E | +--[R]--+ | | C [C] B Q2 | E GND | GND When Q1 switches on, C will charge to 2/3Vcc through R with a source voltage of Vcc - Vce, but when Q2 turns on it\'ll discharge to 1/3 Vcc through Q2\'s Vce(sat), so since Vce(sat) is less than Q1\'s Vcc - Vce, it\'ll take the cap less time to discharge to 1/3 Vcc than it will to charge to 2/3 Vcc.
Well, a lot of capstan motor servos on Studer pro audio tape decks used 555s for decades. They worked extermely well. I suppose the designer just new how to use them properly
martin
Without knowing the configuration it's a bit diffcult to comment. For all I know there is tachofeedback, in which event the repeatability factor is largely removed.
I=V/R if the output gets closer to the rail one way than it does the other
diifferent charge/discharge currents will result.
-- Bye. Jasen
What youse guys failed to note in your circuit recommendations is that output freq varies with VCC. Since this application is a 12V marine elect. sys, variation in system voltage causes changes in motor RPM. Perhaps useful for something, but not for me. Modified the circuit with a 8V reg, since a 5V reg drops the output below TTL and the stepper board doesn't like it. BTW: this driver runs a stepper to rotate a radar antenna. Thus the RPM req. Variation in antenna RPM causes the display to lose sync. Back on track now.
JR North wrote:
-- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth
I must admit I havent look at the typical Studer circuit in long long. But I was always astounded how good this little chip worked in the servo
martin
NOT MY RECOMMENDATION, DUMBASS!!!!!!! As usual with you f____g, know-nothing OPs, you chose the the IDIOT RESPONSE! You have only yourself to blame.
Using the single resistor and cap and CMOS timer, the frequency is
1.44/ 2RC. Where do you see Vcc in that formula?-Bill
"Bill Bowden" wrote in news: snipped-for-privacy@j73g2000cwa.googlegroups.com:
I think the umpire just ruled that one out LBW, the batsman standing on his stumps. Although that would probably be a different Bill Bowden? :)
-- -------------------------------------------------------------- Home Page: http://www.seanet.com/~jasonrnorth
Maybe you should take up flower arranging or something requiring no analytical deliberation whatsoever- you are clearly too mentally deficient for the electrical and mechanical trades.
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