Hi guys, I'm new here!
Basically, I'm wanting to convert a frequency into a voltage. This is for a tachometer for a racing car.
The car's ECU outputs a logic level pulse every engine revolution. I was going to use a LM2917 to convert this into a voltage signal varying between 0 and 4v. Since we're using a superbike engine, the frequency of the signal from the ECU will vary anywhere from 0 Hz up to around 15kHz.
I thought I could do this relatively simply with an LM2917, but I'm really struggling on component values etc. I also was told by someone that my 8-pin LM2917 may not work, since it requires positive and negative-going AC, whereas I'm using pulsed DC.
Can anyone do me a massive favour and suggest a circuit diagram for this unit? Time is short and my efforts so far have proved relatively futile!
Thanks a lot!
[edit] I should probably mention, this is going to need to run off an 8V supply...
Basically, I'm wanting to convert a frequency into a voltage. This is for a tachometer for a racing car.
The car's ECU outputs a logic level pulse every engine revolution. I was going to use a LM2917 to convert this into a voltage signal varying between 0 and 4v. Since we're using a superbike engine, the frequency of the signal from the ECU will vary anywhere from 0 Hz up to around 15kHz.
I thought I could do this relatively simply with an LM2917, but I'm really struggling on component values etc. I also was told by someone that my 8-pin LM2917 may not work, since it requires positive and negative-going AC, whereas I'm using pulsed DC.
Can anyone do me a massive favour and suggest a circuit diagram for this unit? Time is short and my efforts so far have proved relatively futile!
Thanks a lot!
[edit] I should probably mention, this is going to need to run off an 8V supply...