Geotech Forums  

Go Back   Geotech Forums > Technology > Modifications
Reload this Page XL500 sample timing
Register FAQ Calendar Mark Forums Read

Reply
Page 8 of 9 « First 67 8 9
 
Thread Tools Display Modes
  #176  
Old 08-01-2009, 09:20 AM
Micheal Micheal is offline
Senior Member
  
Join Date: May 2009
Posts: 144
Default
Unfortunately it doesnt have frequency function...so I will get one that has the frequenct function
Reply With Quote
  #177  
Old 08-01-2009, 10:18 AM
Qiaozhi's Avatar
Qiaozhi Qiaozhi is offline
Guru (Administrator)
  
Join Date: Jan 2006
Posts: 4,194
Default
Quote:
Originally Posted by Micheal View Post
Unfortunately it doesnt have frequency function...so I will get one that has the frequenct function
It would be an excellent investment to buy an oscilloscope, if you have the money. Otherwise, a meter with a frequency function will be useful. You can then use it to check if the 555 is oscillating.

My suspicion is that the transmitter is generating very weak pulses. That's why it works, but very poorly. The output transistors are most likely kaput.
Reply With Quote
  #178  
Old 08-02-2009, 11:40 AM
Micheal Micheal is offline
Senior Member
  
Join Date: May 2009
Posts: 144
Default
Thanks for your help guys...please bare with me ,I dont have a scope and I dont know how to use one .Thats why I try to use this elimination method to fix things and a lot of the times it works ,Which ones are the output transistors are they the 3906 little buggers becuase I have replaced all of them I think there was 5 and the 79L05 and all the 2 black and all the blue capacitors in the picture I have tried a new lm555 I am trying hard to trace it down but i just cant find it ...I have attached a picture of the board which one is it in the picture
Attached Images
 
Reply With Quote
  #179  
Old 08-02-2009, 03:14 PM
Qiaozhi's Avatar
Qiaozhi Qiaozhi is offline
Guru (Administrator)
  
Join Date: Jan 2006
Posts: 4,194
Default
Quote:
Originally Posted by Micheal View Post
Thanks for your help guys...please bare with me ,I dont have a scope and I dont know how to use one .Thats why I try to use this elimination method to fix things and a lot of the times it works ,Which ones are the output transistors are they the 3906 little buggers becuase I have replaced all of them I think there was 5 and the 79L05 and all the 2 black and all the blue capacitors in the picture I have tried a new lm555 I am trying hard to trace it down but i just cant find it ...I have attached a picture of the board which one is it in the picture
The TX transistors are shown in the attached schematic, and the component layout. I would try replacing these first. Please also check that you have the transistors in the right way round. This may seem obvious, but the pinout depends on the country of manufacture, even for the same part number.
Attached Images
  
Reply With Quote
  #180  
Old 08-03-2009, 12:56 PM
Micheal Micheal is offline
Senior Member
  
Join Date: May 2009
Posts: 144
Default
the schematics you have drawn the parts on is different to my xl500 if you have a look at my photo.The 3055 in mine is a RFP8N18L and on mine there is no MPSU60(I couldnt find anywhere on the net a schematic for this version of the xl500 )
Reply With Quote
  #181  
Old 08-03-2009, 02:44 PM
Qiaozhi's Avatar
Qiaozhi Qiaozhi is offline
Guru (Administrator)
  
Join Date: Jan 2006
Posts: 4,194
Default
Quote:
Originally Posted by Micheal View Post
the schematics you have drawn the parts on is different to my xl500 if you have a look at my photo.The 3055 in mine is a RFP8N18L and on mine there is no MPSU60(I couldnt find anywhere on the net a schematic for this version of the xl500 )
Here's the schematic I have in my data archive. Is it incorrect?
Attached Images
 
Reply With Quote
  #182  
Old 08-06-2009, 09:08 AM
Micheal Micheal is offline
Senior Member
  
Join Date: May 2009
Posts: 144
Default
There are similarities but it is not the same one,(i am currently considering throwing the whole thing in the rubbish bin,but sledge hammering it first)
Reply With Quote
  #183  
Old 08-06-2009, 09:18 AM
Qiaozhi's Avatar
Qiaozhi Qiaozhi is offline
Guru (Administrator)
  
Join Date: Jan 2006
Posts: 4,194
Default
Quote:
Originally Posted by Micheal View Post
There are similarities but it is not the same one,(i am currently considering throwing the whole thing in the rubbish bin,but sledge hammering it first)
Do you have the correct schematic?
If so, please can you post it here?
Reply With Quote
  #184  
Old 08-07-2009, 06:02 AM
Micheal Micheal is offline
Senior Member
  
Join Date: May 2009
Posts: 144
Default
Sorry I dont have the correct schematic for this model ,and I cant find it anywhere on the internet.It will make things a lot more easier if anybody has it.
Reply With Quote
  #185  
Old 02-15-2010, 01:45 PM
mmlove2007 mmlove2007 is offline
Member
  
Join Date: Sep 2008
Posts: 49
Default
Hello to all Dear

If someone has a circuit xl500 Please complete this section to upload files together with Pcb
Reply With Quote
  #186  
Old 02-15-2010, 02:05 PM
homefire's Avatar
homefire homefire is offline
Guru
  
Join Date: Jun 2008
Posts: 280
Default
Quote:
Originally Posted by mmlove2007 View Post
Hello to all Dear

If someone has a circuit xl500 Please complete this section to upload files together with Pcb

Go back through the pages of this thread and you will find it all.
Reply With Quote
  #187  
Old 02-16-2010, 05:54 AM
mmlove2007 mmlove2007 is offline
Member
  
Join Date: Sep 2008
Posts: 49
Default
i can old pcb in pdf file

is not pcb xl500
Reply With Quote
  #188  
Old 02-16-2010, 08:50 AM
pebe pebe is offline
Member
  
Join Date: Jan 2010
Location: Scotland
Posts: 75
Default
Micheal,
You may be interested in this free software that makes your PC into a oscilloscope, using the sound card in your PC.

http://www.zeitnitz.de/Christian/scope_en

The 'scope has a limited frequency response, and is intended mainly for audio circuits. But will probably give you a fair idea of what's going on in most MD circuit.

It also has a frequency analyser for frequencies up to 20kHz, which you can use to measure the frequency of an oscillator. There is also an audio oscillator.

As I said, it is limited in its use, but -heh - it'd FREE. So why not dowload it and try it? Take note of the need to use a resistive attenuator if the circuit you are measuring exceeds 5V.
Reply With Quote
  #189  
Old 02-17-2010, 07:05 PM
mmlove2007 mmlove2007 is offline
Member
  
Join Date: Sep 2008
Posts: 49
Default
please uplodae full cicuit

thank you
Reply With Quote
  #190  
Old 07-30-2010, 09:13 AM
ahmet19 ahmet19 is offline
Junior Member
  
Join Date: Jun 2009
Posts: 8
Cool xl500 digital
xl-500 full digital
Attached Images
 
Reply With Quote
  #191  
Old 07-30-2010, 12:32 PM
mikebg's Avatar
mikebg mikebg is offline
Guru
  
Join Date: Feb 2008
Location: Plovdiv, Bulgaria
Posts: 517
Default
Errata in design of pro-TR (posting #190):
1. The resistance of R7 should be lower ohm for fast charging and discharging input capacitance of Q1.
2. Tere is no point connecting R41 to R39 & R40.
Reply With Quote
  #192  
Old 07-30-2010, 03:50 PM
selim selim is offline
Junior Member
  
Join Date: May 2009
Posts: 12
Default xl-500 analog
http://www.geotech1.com/forums/showthread.php?t=12840
Attached Images
  
Reply With Quote
  #193  
Old 07-30-2010, 04:13 PM
ahmet19 ahmet19 is offline
Junior Member
  
Join Date: Jun 2009
Posts: 8
Default
Quote:
Originally Posted by mikebg View Post
Errata in design of pro-TR (posting #190):
1. The resistance of R7 should be lower ohm for fast charging and discharging input capacitance of Q1.
2. Tere is no point connecting R41 to R39 & R40.
ok..
1.R7= 100R~470R
2.you're right, I was doing a drawing error
Reply With Quote
  #194  
Old 07-30-2010, 05:16 PM
smity smity is offline
Junior Member
  
Join Date: May 2010
Posts: 24
Default For ahmet19
What is "XL-500 DIGITAL PI"? Who repeated it? Characteristics? A photo? Video? PCB? Software? Coil? Or it simply theory?
Reply With Quote
  #195  
Old 07-30-2010, 10:38 PM
ahmet19 ahmet19 is offline
Junior Member
  
Join Date: Jun 2009
Posts: 8
Default
Quote:
Originally Posted by smity View Post
What is "XL-500 DIGITAL PI"? Who repeated it? Characteristics? A photo? Video? PCB? Software? Coil? Or it simply theory?

hi
I designed the XL-500 digital. If you want to do if the PCB of my stock. Software no problem. I've made a similar escape attempt. I made such an analog circuit and digital delta pulse.
I'm ready for my XL-500 PCB. But will you make it. I also write software.
Reply With Quote
  #196  
Old 07-31-2010, 02:56 AM
smity smity is offline
Junior Member
  
Join Date: May 2010
Posts: 24
Default For ahmet19
For development - the big respect! But it would be desirable to learn about results (sensitivity, a ground, discrimination). If it is a noncommercial variant, write please more information. In advance I thank.
Reply With Quote
  #197  
Old 07-31-2010, 11:16 AM
Micheal Micheal is offline
Senior Member
  
Join Date: May 2009
Posts: 144
Default
wow this is interesting looks like good work......have you made it yet
Reply With Quote
  #198  
Old 07-31-2010, 10:31 PM
ahmet19 ahmet19 is offline
Junior Member
  
Join Date: Jun 2009
Posts: 8
Default
PCB scheme was okay. Please if there are mistakes, we fix the errors. I do not know English. I'm sorry.
Attached Images
 
Reply With Quote
  #199  
Old 08-01-2010, 03:20 AM
smity smity is offline
Junior Member
  
Join Date: May 2010
Posts: 24
Default
Fine operation! Thanks! Remove video on the standard purposes (a coin 1еvro? a Coca Cola tin...), or write maximum possibilities of this instrument
Reply With Quote
  #200  
Old 08-01-2010, 04:00 AM
mikebg's Avatar
mikebg mikebg is offline
Guru
  
Join Date: Feb 2008
Location: Plovdiv, Bulgaria
Posts: 517
Default
Quote:
Originally Posted by ahmet19 View Post
PCB scheme was okay. Please if there are mistakes, we fix the errors. I do not know English. I'm sorry.
Ahmet, I also don't know English but use Google machine translator.
Attached Images
 
Reply With Quote
Reply
Page 8 of 9 « First 67 8 9

« Previous Thread | Next Thread »
Thread Tools
Display Modes
Linear Mode Linear Mode

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT. The time now is 12:29 AM.

Contact Us - Geotech - Archive - Top

Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2010, Jelsoft Enterprises Ltd.