Wireless Auto Tachometer


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Anyone performing their own automobile tune-ups knows how important it is to know your engines speed. With this tachometer, you can measure your engines speed without any connections or annoying timing lights.

Schematic

This is the schematic of the Tach

PC board layout and parts placement

This is the parts placement and printed circuit pattern of the Tach

Parts

Part
Total Qty.
Description
Substitutions
C110.47uF Capacitor
C2147uF Electrolytic Capacitor
D118V 1W Zener Diode
D2, D3, D431N914 Diode
M11200uA Meter
Q1, Q222N3391A Transistor
R1, R2, R931K 1/2 W Resistor
R3147K 1/2 W Resistor
R4110K 1/2 W Resistor
R5, R6225K Trim Pot
R7110K Trim Pot
R81200 Ohm 2 W Resistor
R10115K 1/2 W Resistor
R1112.2K 1/2 W Resistor
S11SPST Togglae Switch
S21Three Position Single Pole Rotary Switch
MISC1Telescoping Radio Antenna, Enclosure, Power Cable and Battery Connector

Notes

  1. Calibrate the unit as folows:
    1. Set up this circuit:

      This is the setup for calibrating the Tach

    2. Turn on the Tach and allow a few minutes for temperature stabilization.
    3. Set S2 to 4 cylinders and adjust R5 for a meter indication of 180 (1800 rpm).
    4. Set S2 to 6 cylinders and adjust R6 for a meter indication of 120 (1200 rpm).
    5. Set S2 to 8 cylinders and adjust R7 for a meter indication of 90 (900 rpm).

  2. To use the Tach, turn it on and let it sit for one minute to allow for temperature stabilization. Extend the antenna, select the right number of cylinders and hold the unit over the engine. If the reading is erratic or the needle jumps around, move the antenna closer to the ignition coil or spark plug wires.
  3. The unit draws power from the car battery. If it is connected backwards, it will not work, but it won't be damaged.

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Comments

Add A Comment

giovani
Wireless Auto Tachometer
Thursday, September 25, 2014 10:41:07 AM
sir i want to know if this can be integrated in a mechanical electric meter. and how reliable it is in measuring the rotation of a disk in that particular meter. thanks..please do reply.
anonymous
Wireless Auto Tachometer
Saturday, June 16, 2012 10:06:46 AM
I like the circuit. I have been drinking every day for weeks and consequently, I am out of money. Please send me a built circuit and some money so that i may drink and continue with school. Thanks and please hurry. I have a final coming up and there is a wicked good band at the pub down the street and I need beer money and also have no time to work or build this circuit. i will submit this circuit as my own design. Hope you don't mind. Thanks again.
rohan
Wireless Auto Tachometer
Saturday, April 30, 2011 9:44:58 AM
sir, i am doing final yr ECE,i like automotive electonics,so i am going to do a project in dis field, i want to know all the details of the wireless auto tachometer with all the relevant details like circuit diagrams, the principle of operation and the list of components required in the diagram,project paper.I would be very thankful to you if you send me the above details to my e-mail id as soon as possible. Thank you sir.

(Editor's notes: Did you even read the page?)

Amazed
Wireless Auto Tachometer
Tuesday, November 23, 2010 8:12:31 AM
I am truly amazed at how many of the people placing a comment is willing and able to rip off an idea for which they can claim no credit and pass it off as their own. If you are "studying" electronics study the circuit and draw you own conclusions you lame leeches. Out
sillybunny
Wireless Auto Tachometer
Wednesday, July 28, 2010 3:22:28 AM
hello sir...I want to know all the details of the wireless auto tachometer with all the relevant details like circuit diagrams, the principle of operation and the list of components required in the diagram,project paper and also coding for the programming..I would be very thankful to you if you send me the above details to my e-mail id as soon as possible so that i can use it as my reference for my final year project.. . Thank you sir.
Bob
Wireless Auto Tachometer
Sunday, June 06, 2010 5:49:31 PM
I like the idea of this circuit, however the circuit itself is not designed very well, you basically have to keep calibrating it constantly because it's very sensitive to temperature changes.
Jay
Wireless Auto Tachometer
Tuesday, September 15, 2009 4:41:06 PM
interesting design I am curious if this might also work with a coil of wire wrapped around a specific plug wire or should it be the main ignition coil?
vijay harish
Wireless Auto Tachometer
Thursday, August 06, 2009 9:18:21 AM
sir, i am doing final yr ECE,i like automotive electonics,so i am going to do a project in dis field, i want to know all the details of the wireless auto tachometer with all the relevant details like circuit diagrams, the principle of operation and the list of components required in the diagram,project paper.I would be very thankful to you if you send me the above details to my e-mail id as soon as possible. Thank you sir.
Moye A.I.
Wireless Auto Tachometer
Wednesday, June 24, 2009 2:08:45 PM
Sir, i want to know all the details of the wireless auto tachometer with all the relevant details like circuit diagrams, the principle of operation and the list of components required in the diagram.I would be very thankful to you if you send me the above details to my e-mail id as soon as possible. I'm a final year student and have taken it as my project. Thank you sir.
Ernesto Forchetto
Wireless Auto Tachometer
Saturday, November 22, 2008 5:31:06 AM
Hi, I'm a student and therefore spend my time drinking, playing role games on my daddy's PC, and practising advanced onanism. Can you therefore send me all details of this project, properly written and bound and, of course, a ready working prototype so I can present it as my course project and get top marks. Right on man...
HARCHARN
Wireless Auto Tachometer
Wednesday, October 29, 2008 6:46:57 AM
hi it is usefull to all electronic related people but sir i can try on this project on my bike single cylinder. how can be possible please send me full details or sir i lived in india use 220 volt 50hz power .if it is possible please send me related details i am very thankfull to you.ok
Bob
Wireless Auto Tachometer
Wednesday, September 24, 2008 3:42:07 PM
can another resistor be added to have this work on a 2 cylinder Harley Davidson motor?
anonymous
Wireless Auto Tachometer
Wednesday, September 03, 2008 10:59:45 AM
I have been a Product Design Engineer for 28 years now, and find the Wireless portion interesting. In Reality, you still must hook up a Power source, and for any moving vehicle, It's just as easy to make the other connections as well for a hard wire connection, and without having all that Radior Frequency Static. Now for a Generator or Stationary Engine, this would be great.
anonymous
Wireless Auto Tachometer
Wednesday, August 06, 2008 4:54:26 AM
Sir, i want to know all the details of the wireless auto tachometer with all the relevant details like circuit diagrams, the principle of operation and the list of components required in the circuit diagram.I would be very thankful to you if you send me the above details to my e-mail id as soon as possible.
Arnel C.
Wireless Auto Tachometer
Sunday, July 20, 2008 10:49:27 PM
is there a way to use this with an internal combustion engine that has only one cylinder (i.e. motorcycle engines)? i'm really interested to put this in my motorcycle. please enlighten me, sir.
Wook
Wireless Auto Tachometer Alternate Calibration using 50Hz
Saturday, July 05, 2008 11:44:01 PM
The above calibration procedure is for 60Hz AC. Calibrating using a 50Hz 12VAC transformer If your mains power is 50Hz, set up as per the calibration schematic above, and use this procedure: Set S2 to 4 cylinders and adjust R5 for a meter indication of 150 (1500 rpm). Set S2 to 6 cylinders and adjust R6 for a meter indication of 100 (1000 rpm). Set S2 to 8 cylinders and adjust R7 for a meter indication of 75 (750 rpm).
anonymous
Wireless Auto Tachometer
Monday, June 16, 2008 7:41:44 AM
Hi, interesting project, well done...but will the person/s posting multiple requests under diffrent names please stop. If you have course work to do, do some research and learn something and stop trying to leach some easy grades, also it will help if when requesting that you do not use such a demanding tone as people dont like this. If this work would be used as course work then whom ever uses it should have a sound understanding of how it works just by studying the diagram, if not then it is to advanced for you to be using in your work. Dave.
Ben w.
Wireless Auto Tachometer
Monday, April 07, 2008 12:21:51 PM
hello sir i have been looking at your wireless tach and have choose to do it as a project ror my electronics class could you please send me details on this project thank you
anonymous
Wireless Auto Tachometer
Saturday, March 29, 2008 12:40:52 AM
Very nice!!! I was seraching for a signal conditioning circuit, to sense RPM from the engine. I'll use this circuit to feed pulses to a micro-processor and capture RPM digitally (torque curve up to a scale factor)

(Editor's notes: Also look at the schematics of the Megasquirt project.)

puneet
Wireless Auto Tachometer
Tuesday, March 18, 2008 1:44:41 PM
sir i want to know the detailed working and design of this wireless auto tachometer. can you please send me all information related to this. i will be very thankful to you.
Mihai Stanga
Wireless Auto Tachometer
Monday, March 10, 2008 3:43:00 AM
Hello, sir. Given the fact taht my original car tachometer doesn't work for more that 2 days and i'm really sick and tired of fixing it, I want to build your design. The only problem is that I live in Europe and here we have 220-240V @ 50Hz at mains. Can you please tell me how to calibrate it in these conditions ? Thank you.
alireza
Wireless Auto Tachometer
Monday, March 03, 2008 1:52:19 PM
Hi sir, Can you send me the detail information about the working and making of wireless auto tachometer. As soon as possible . please sir i am requisting u to send the more & more detail about the project.very thanks
sivakumaran
Wireless Auto Tachometer
Monday, February 11, 2008 1:57:46 AM
in the Wireless Auto Tachometer circuit diagram, the M1 refers to the micro ammeter or tachometer.
vinod kumar gautam
Wireless Auto Tachometer
Wednesday, February 06, 2008 4:26:46 AM
Hello sir, Can you send me the detail information about the working and making of wireless auto tachometer. As soon as possible . please sir i am requisting u to send the more & more detail about the project. thanks
senin
Wireless Auto Tachometer
Thursday, January 24, 2008 9:22:28 PM
Hello sir, Can you send me the detail information about the working and making of wireless auto tachometer. As soon as possible . please sir i am requisting u to send the more & more detail about the project. thanks
Rasika M
Wireless Auto Tachometer
Monday, January 14, 2008 3:30:56 AM
Dear Sir , can you send me the full detailed information about the project because I have to submit the project report within 2 weeks.So I kindly request you tu send the information as soon as possible
Manideep
Wireless Auto Tachometer
Friday, January 11, 2008 11:51:21 AM
Sir, u have done a gr8 job and u have been a role model 4 a lot of upcoming Engineers and circuit designers. ypur Wireless Auto tachometer has been very interesting and I will be obliged if u please send me a detailed circuit and a brief overview abt that.Your early reply is very much happier 4 me as i have to submit a paper on this as early as possible
Saifullah Raza
Wireless Auto Tachometer
Thursday, January 10, 2008 7:11:34 AM
Hi Tabish !!! lets c a gr8 circuit to measure rpm
nandakumar
Wireless Auto Tachometer
Thursday, December 20, 2007 12:21:40 AM
hello sir,can you send me the full detailed information about the project because i was asked to submit the project report within 2 weeks.so i kindly request you tu send the information as soon as possible.
mohanraj
Wireless Auto Tachometer
Wednesday, December 12, 2007 8:16:25 AM
Hello sir, Can you send me the detail information about the working and making of wireless auto tachometer. As soon as possible . please sir i am requisting u to send the more & more detail about the project. thanks
sarthak
Wireless Auto Tachometer
Thursday, November 15, 2007 6:49:31 AM
Hello sir, Can you send me the detail information about the working and making of wireless auto tachometer. As soon as possible . please sir i am requisting u to send the more & more detail about the project. thanks
pradeep kumar
Wireless Auto Tachometer
Saturday, October 27, 2007 10:29:33 AM
Hello sir, Can you send me the detail information about the working and making of wireless auto tachometer. As soon as possible because monday is the last date to submit the name of the project. S please sir i am requisting u to send the more & more detail about the project. thanks
Bikram kumar
Wireless Auto Tachometer
Wednesday, October 24, 2007 4:10:33 AM
hi, can you send me the detail information about the working and making of wireless auto tachometer.
anonymous SANUSI DAUDA
Wireless Auto Tachometer
Tuesday, October 23, 2007 11:15:33 AM
Sir, you have done a wonderful work, I apperiaciate and acknowledge your effort. I guees you are a very busy man, but would like you to help me with some "write up" regarding the wireless auto tachometer. I hope I will have that , I acknowledge your effort. thanks
KARTHIK
Wireless Auto Tachometer
Tuesday, October 02, 2007 4:58:24 PM
hey, can u send me the detailed explanation and process involved in construction of the above project ??? .... please !!
Dano Hari P
Wireless Auto Tachometer
Monday, September 24, 2007 10:54:34 PM
I've built it and found it perfectly functioned as well
anonymous
Wireless Auto Tachometer
Sunday, September 09, 2007 6:18:21 PM
I haqve a six volt positive ground system. what R values do I have to change and will circuit operate as shown as long as I connect pos and neg accordingly?
james.t
Wireless Auto Tachometer
Saturday, September 08, 2007 6:22:37 AM
hi,ur ideas are very innorvative. cud you if possible send me all the notes for this project.i would lyk to intergrate your idea so that it may be applied elsewhere
anonymous
Wireless Auto Tachometer
Wednesday, September 05, 2007 12:25:57 AM
Better give some explanation about the design of the circuit for those looking at these kind for the first time.
bhargav
Wireless Auto Tachometer
Tuesday, August 21, 2007 9:19:02 AM
Applications?
phillip
Wireless Auto Tachometer
Friday, August 10, 2007 4:36:27 AM
can you help me make a tachometer for my motorcycle (single cylinder) and make a digital readout for that without any micprocessors involved (analog gauge is also GOOD)
Jeff
Wireless -Tachometer
Monday, August 06, 2007 12:58:01 PM
I'm looking for a wireless for an ATV one cylinder four stroke, do you have anything that will work?
dipen
Wireless Auto Tachometer
Saturday, July 21, 2007 12:31:34 AM
if i want to see mor detail about this the wat i have to do? plz suggest me
zak
Wireless Auto Tachometer
Thursday, June 21, 2007 11:18:39 AM
what does the tachometer do! and what does it measure? how can it be used? because i have made a beach buggy
anonymous
Wireless Auto Tachometer
Saturday, June 09, 2007 5:22:46 AM
Sorry, i'm beginner in electronic. What is M1, is panel meter or amperemeter ?
oscar lama
Wireless Auto Tachometer
Friday, June 08, 2007 11:53:05 PM
Very simple and perfect circuit for to have an idea of RPM in my van !!!! I will calibrated with real tachmeter and make new back-face of M1 to use it.
Eduardo
Wireless Auto Tachometer
Friday, June 01, 2007 12:17:49 PM
Could you send me more information about the instaltion and use of the tach?
anonymous
Wireless Auto Tachometer
Saturday, May 19, 2007 4:37:49 PM
IT'S WORKS
anonymous
Wireless Auto Tachometer
Friday, May 18, 2007 4:22:40 AM
im having trouble reading the schematic because its very blurry also please explain a2? thanks
kibet ronoh david
Wireless Auto Tachometer
Thursday, May 10, 2007 4:26:09 AM
sooped up work men!
Mr.Permadi H J
Wireless Auto Tachometer
Monday, May 07, 2007 6:35:55 AM
i have not try yet, but i had look this circuit, and I will analysis
PANKAJ PAWAR
Wireless Auto Tachometer
Saturday, April 07, 2007 8:42:50 AM
HOW WE MEASURE THE SPEED IF WE ARE GOING TO USE TECHOMETER? PLEASE SEND ME EMAIL TO MY ID.
JR WEEKS WEEKSnymous
Wireless Auto Tachometer
Thursday, March 29, 2007 3:02:24 PM
Does this unit also work with diesel engines? Can I remote it's output screen to my instrument panel?
manish
Wireless Auto Tachometer
Saturday, March 24, 2007 2:35:40 AM
what is the rating of battery
DMG
Wireless Auto Tachometer
Sunday, March 04, 2007 7:47:12 PM
Can the tach be adapted for a one-cylinder engine? Why are D3 and D4 in series? Don't they do the same thing? Similarly why are R10 and R11 in series? Wouldn't a single resistor of 17.2K do the same thing? Thanks, DMG
DMG
Wireless Auto Tachometer
Sunday, March 04, 2007 5:10:07 PM
Can this be modified for a single-cylinder engine? It would seem to me that the rotary switch could be eliminated and a single pot could replace the three pots. Any ideas?
javed
Wireless Auto Tachometer
Friday, March 02, 2007 11:34:40 PM
What reading will be shown on meter. Do we have to multiply it by some factot like 1000 or so. What about a 3 cylinder engin.
swapnil solaskar
Wireless Auto Tachometer
Thursday, March 01, 2007 8:34:24 AM
where is see rpm of engine in circuit
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