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DELETED (Inactive)
5 Posts |
 Posted - Mar 16 2004 : 11:05:48 PM
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Hello, I am from Indonesia, I am new here and new in electronics. I am interested in the wireless tachometer, but the diagram pictures are not clear to me. Anybody can send me better pictures of the diagrams to me? Please send to my email dity@telkom.net. Or send in this forum is OK.
This device is a frequency to voltage converter, right? What if we want to change the input source, what parts should be changed if we want to have the input from a Hall Effect sensor, for instance, so we can make an electronic speedometer?
Btw, is this forum have a mailing list like in Yahoo Groups?
Thank you.
Aditya Hermawan |
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YS
Nobel Prize Winner
USA
1132 Posts |
Posted - Mar 16 2004 : 11:48:39 PM
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Yes, it is a sort of F to U converter. Search this forum, it was covered before.
To add Hall sensor, which has open collector output, I would connect sensor output instead of antenna to R1, and add a load resistor (say,2.2K) from that point to +Vcc. R1 could be increased to 4.7K. I would also add electrolytic cap parallel to zener diode.
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DELETED (Inactive)
5 Posts |
Posted - Mar 17 2004 : 11:28:24 PM
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Thank you YS. I already search but still can't find a detail discussion on this here.
Here I tried to draw the diagram again, is this correct? Because the original picture wasn't clear.
I also draw your idea, but I am still not sure. Is this what you mean, placing a capacitor parallel to zener? (see the red line) But where should I put the 2.2k resistor? Sorry I am still a novice 
Aditya Hermawan |
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YS
Nobel Prize Winner
USA
1132 Posts |
Posted - Mar 18 2004 : 12:04:31 AM
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Hi Aditya,
your schematic does not show up. please search the forum on how to post your pictures.
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DELETED (Inactive)
5 Posts |
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YS
Nobel Prize Winner
USA
1132 Posts |
Posted - Mar 18 2004 : 09:18:09 AM
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That's what I've got clicking on these links:
We're sorry, but this page is currently unavailable for viewing.
If this site belongs to you, please read this help page for more information and assistance.
For general questions see our main help area, or search for other member pages.
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n/a
DELETED (Inactive)
5 Posts |
Posted - Mar 19 2004 : 12:59:21 AM
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I don't know why this happens, yesterday I tried and it worked. May I send the schematic to your email? I already send you an email asking you this 
YS, I have more questions, I hope you don't mind. Why should we use the additional components you suggested? I still learn the logic of electronics
And what if we want to use the tacho for 1 or 3 cylinder engine, what trimpot should be used? Is there any formula regarding this relationship?
Thanks...
Aditya Hermawan
Edited by - mawot on Mar 19 2004 01:00:48 AM |
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YS
Nobel Prize Winner
USA
1132 Posts |
Posted - Mar 19 2004 : 10:01:38 AM
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yes you may, if it is less than 1M.
But I had not receive any email from you.
I suggested using a cap to reduce possible noises in the system. Hall sensors are sensitive to power filtering. Extra resistor is needed by the sensor also.
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roshljo
New Member
4 Posts |
Posted - Feb 01 2006 : 11:39:20 AM
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Hi, I'm from Bulgaria and need to build the digital tachoimeter. However I am not able to find the needed transistors in the stores here.
I know nothing about electronics and wondered if anyone can help me with choosing a replacement for the 2N3391A Transistor. I made a list of the transistors available to me at http://philip.ourserver.net/availabletransistors.htm
Thank you,
Nikolay |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Feb 02 2006 : 09:08:40 AM
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Have you checked the cross-reference guides? All semiconductor manufacturers (for example National) publish guides on their websites cross-referencing standard part numbers to their own. There is likely a substitution out there. Likewise if you can find the specs for that transistor you can find another that closely or exactly matches and use it instead.
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roshljo
New Member
4 Posts |
Posted - Feb 06 2006 : 7:49:20 PM
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Aaron, I do not know what a transistor is and how it works and yet you are suggesting me to go and look for a substitute in the cross-reference tables!?
Ok, I did this search in a few such databases before I posted my question and found nothing...
Please someone look into the list I provided in my previous post (http://philip.ourserver.net/availabletransistors.htm) and tell me which one of the listed transistors will do the job.
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Feb 07 2006 : 10:16:38 AM
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quote:
Aaron, I do not know what a transistor is and how it works and yet you are suggesting me to go and look for a substitute in the cross-reference tables!?
Call it a learning experience.
You just need to find a transistor that matches your type (PNP or NPN) and then closely match the other specs.
You might want to try other suppliers such as Digikey, NTE, National, etc.
Cross-referencing is something that you will do VERY often in electronics, so it pays to get good at it.
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Mattymattmat
New Member
2 Posts |
Posted - Mar 08 2006 : 7:10:11 PM
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Mawot, i can see your pics and they look correct. I am a novice electronics person too and do accompany that i want to know where the display is on this circuit??
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Mar 09 2006 : 10:24:29 AM
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The display is meter M1.
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Mattymattmat
New Member
2 Posts |
Posted - Mar 09 2006 : 4:43:49 PM
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Can you give me a bit more of a description than a 200uA Meter? Required voltage? Digital display or analogue? Would it be a voltage meter, amp meter?
Cheers
Edited by - Mattymattmat on Mar 09 2006 6:03:14 PM |
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Mar 12 2006 : 10:15:58 AM
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A 200uA meter is an ammeter. You probably want analog as it will make it much easier to read. They generally aren't rated for voltage but you are looking at a meter designed for under 30V.
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wireless tachometer diagram
