Discussion in "Electronics" started by    ankitbajaj01    Apr 16, 2015.
Thu Apr 16 2015, 07:20 PM
#1
Hello,

Please let me know how can I Check whether crystal is working properly or not?

Please suggest...
Fri Apr 17 2015, 12:41 PM
#2
check it on CRO with 10x probes, you will see a sine wave.
Tue Apr 21 2015, 03:21 PM
#3
As I don't have CRO, Can we test the crystal with Multimeter Showing Frequency Range Upto 15 MHz?
Do we need the keep the Circuit on To check the crystal?
Tue Apr 21 2015, 04:24 PM
#4
A multimeter won't help

The most practical way is to substitute another similar,crystal.

What crystal are you using and what for ?
 ankitbajaj01 like this.
Tue Apr 28 2015, 05:17 PM
#5
Hello,
I am making one circuit which detect presence of water and then operate motor to fill over head tank.
I am facing some issues in making it.
Situation 1: This circuit will be running 24x7... Sometimes system works abnormally. May be because of fluctuation. I want to take care of that. Once reset it starts working good again. I want to find real reason for that.
Situation 2. Sometime I need to change the capacitor 33pf and Crystal 11.0592 MHz in my AT89S52 Circuit.
Is it not appropriate to use this controller for 24x7 Application?
Need your Guidance...
Regards...
Tue Apr 28 2015, 08:59 PM
#6


Hello,
I am making one circuit which detect presence of water and then operate motor to fill over head tank.
I am facing some issues in making it.
Situation 1: This circuit will be running 24x7... Sometimes system works abnormally. May be because of fluctuation. I want to take care of that. Once reset it starts working good again. I want to find real reason for that.

ankitbajaj01



This does not sound like a crystal fault.. why do you think it is ?
It is more likely to be the power supply or the circuit design or construction.
Can you post your design and code ?


Situation 2. Sometime I need to change the capacitor 33pf and Crystal 11.0592 MHz in my AT89S52 Circuit.

ankitbajaj01



Why ?


Is it not appropriate to use this controller for 24x7 Application?

ankitbajaj01


Certainly ..24x 7 x 365 no problem.
Wed Apr 29 2015, 05:34 PM
#7
Hello ExperimenterUK...

My confidence gets boost up whenever I talk to you. Thanks for your all kind support always.
Coming to discussion...
@Crystal
When system behaves abnormally, I change the Crystal and 33pF cap, it starts working fine. Fast Frequent switching on and off also cause this issue sometimes.

@Power Supply
I had just put 230x12V transformer...Full wave bridge Rectifier...then 1000uF Capacitor then 7805 and Use the 5 Volt as required in circuit.
Yesterday only I made changes 230x12V transformer...Full wave bridge Rectifier...then 1000uF Capacitor...Two 0.1uF capacitors... then 7805... then 100uF Capacitor...then 0.1uF cap...And also one 0.1uF cap at Vcc pin of Microcontroller to Ground... Testing its performance.
@230V dc Chopper.
Today I open one onion chopper, I saw Capacitor 0.2uF and Resistor in parallel with the Coil in series from both end of capacitor...These two connection made Rectifier In. then Directly was connected to the 230V DC motor. I sense it is a filter made by RC parallel and L in series on both way. Want to know about the way this filter working. When I removed Inductor coil from circuit motor stopped working. Was it making pure DC, so now in its absence, 230V DC motor is not working?

Give me your comments on this.
Wed Apr 29 2015, 08:33 PM
#8


Hello ExperimenterUK...

My confidence gets boost up whenever I talk to you. Thanks for your all kind support always.

ankitbajaj01


Thank you hope I can live up to it.

I'm sure you are right to improve your power supply.
*Very* likely your problem is noise in the mains supply.
Switching motors causes a lot of noise.
Fit mains filters if you can.
Add as many caps as you can.
Put extra 0.1uF ceramic caps as near the micro supply pins as possible.


Today I open one onion chopper, I saw Capacitor 0.2uF and Resistor in parallel with the Coil in series from both end of capacitor...These two connection made Rectifier In. then Directly was connected to the 230V DC motor. I sense it is a filter made by RC parallel and L in series on both way. Want to know about the way this filter working.

ankitbajaj01


How filters work is really complicated, I just accept that they do
knowing one when I see one is enough for me




When I removed Inductor coil from circuit motor stopped working. Was it making pure DC, so now in its absence, 230V DC motor is not working?

ankitbajaj01


I'm assuming the coil was a choke (filter), intended to stop the motor sending noise out
into the mains supply( and messing up electronic devices like yours ).
The motor current flows through it , so it is needed. Put it back
It does not turn AC to DC.
If your motor has brushes, it can probably run on AC or DC, but will generate a lot
of interference.
Thu Apr 30 2015, 05:51 PM
#9
Hello ExperimenterUK...
I will be showing you the power supply figure tomorrow. and we will further discuss on that.
But Let me know that if I place 2200uF cap instead of 1000uF cap for the 12V storage will it affect in wrong way?
I just sensed at time of relay switching sometimes whole system gets fluctuation and goes down. Can it be because of less charge storage in cap 1000uF?
Regards...
Thu Apr 30 2015, 10:03 PM
#10


But Let me know that if I place 2200uF cap instead of 1000uF cap for the 12V storage will it affect in wrong way?

ankitbajaj01


You can always use a bigger capacitor to smooth power supplies.
2200uF is better than 1000.
4700 is better than 2200.. but going higher than you need is a waste of money.


I just sensed at time of relay switching sometimes whole system gets fluctuation and goes down.

ankitbajaj01


Is that when the motor is connected ?
if so, it is probably the motor that causes the problem.


[ Edited Sun May 03 2015, 05:58 PM ]

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how to interface 8051 microcontroller with NRF24L01+ module
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