Hi, just joined the forum for a little advice.
I've been involved in a few little projects in the past but to be quite honest, my electronic theory is very limited.
Currently, I'm trying to get a tachometer on my boat to work and looking for some basic advice on boosting the signal.
The tachometer works on a pulse from the ignition that is made by an inductive copper wire coil wound around the HT lead.
This arrangement produces a pulse of around 2.5mV at a current of about 1.5mA. However, because it is a long run to the helm panel, by the time it arrives the signal is barely detectable. Because of this the tachometer doesn't work. My test meter will only go down to about 0.1mV and it is certainly less than this. I tried using a screened cable but this didn't seem to help.
So, what is the best way to boost this signal? I was thinking maybe a pull up circuit of some type? Or can someone offer another suggestion?
Thanks in advance. Bob.
I've been involved in a few little projects in the past but to be quite honest, my electronic theory is very limited.
Currently, I'm trying to get a tachometer on my boat to work and looking for some basic advice on boosting the signal.
The tachometer works on a pulse from the ignition that is made by an inductive copper wire coil wound around the HT lead.
This arrangement produces a pulse of around 2.5mV at a current of about 1.5mA. However, because it is a long run to the helm panel, by the time it arrives the signal is barely detectable. Because of this the tachometer doesn't work. My test meter will only go down to about 0.1mV and it is certainly less than this. I tried using a screened cable but this didn't seem to help.
So, what is the best way to boost this signal? I was thinking maybe a pull up circuit of some type? Or can someone offer another suggestion?
Thanks in advance. Bob.