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Using a LM301 OP-AMP as a crystal accosilator.

S

Scott Wiper

Jan 1, 1970
0
Sorry If I missed spelled the top part. I need to know how you can use a
LM301 OP-AMP or a SHMITT trigger IC to 10MHZ out from a tin can crystal.
Also I need to know if this can be done at +5VDC or do you have to go to
+12VDC? Another option I am also trying to figure out is to use a 4MHZ
resonator that has to out pins and a ground pin in the center.

I will use binary ripple counters to divide this down to 60HZ for a home
made digital clock I am working on. The A.C. coming from the wall will be
the primary clocking source but when it loses power I would like the
crystal circuit to take over and continue to clock the project. I would like
to keep this "cheap and dirty" if possible.

A hand drawn schamtic would help with this problem.
 
J

Jim Thompson

Jan 1, 1970
0
Sorry If I missed spelled the top part. I need to know how you can use a
LM301 OP-AMP or a SHMITT trigger IC to 10MHZ out from a tin can crystal.
Also I need to know if this can be done at +5VDC or do you have to go to
+12VDC? Another option I am also trying to figure out is to use a 4MHZ
resonator that has to out pins and a ground pin in the center.

I will use binary ripple counters to divide this down to 60HZ for a home
made digital clock I am working on. The A.C. coming from the wall will be
the primary clocking source but when it loses power I would like the
crystal circuit to take over and continue to clock the project. I would like
to keep this "cheap and dirty" if possible.

A hand drawn schamtic would help with this problem.

No. An LM301 has insufficient bandwidth. A Schmitt trigger inverter
generally won't self-start. Use a 74HCU04, unbuffered inverter.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| [email protected]_innovations.com Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

For proper E-mail replies SWAP "-" and "_"

Why is it that Democrats can't debate politely?
And are only rude and interruptive.
Lack of mental capacity?
 
B

Bill Bowden

Jan 1, 1970
0
Scott Wiper said:
Sorry If I missed spelled the top part. I need to know how you can use a
LM301 OP-AMP or a SHMITT trigger IC to 10MHZ out from a tin can crystal.
Also I need to know if this can be done at +5VDC or do you have to go to
+12VDC? Another option I am also trying to figure out is to use a 4MHZ
resonator that has to out pins and a ground pin in the center.

I will use binary ripple counters to divide this down to 60HZ for a home
made digital clock I am working on. The A.C. coming from the wall will be
the primary clocking source but when it loses power I would like the
crystal circuit to take over and continue to clock the project. I would like
to keep this "cheap and dirty" if possible.

A hand drawn schamtic would help with this problem.


The easy way is to use a 32.768 KHz crystal from an old watch
or quartz clock and divide it down to 1 second with a 15 stage counter.
There is an example schematic using the 4020 14 stage counter and one
additional D flip flop at:

http://ourworld.compuserve.com/homepages/Bill_Bowden/dclock.htm

-Bill
 
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