StudentSA
Member
I am embarking on building an electronics project for a old classic vehicle of mines. I want to build a RPM meter.
I have however found myself stuck at the very start.
The signal to be used is provided by the vehicles coil -ve "low tension" terminal. This terminal is ideally suppose to go 12v, 0 ,12V ,0 ... etc as the points open and close for each cylinder fire.
However due to the high voltages generated by the coil the responce on the negative low tension circuit can experiance short large voltages impulses and resonance.
I want to design a circuit that would condition this signal to something manageble without spikes and resonance. just smooth 12V 0V or 5V 0V etc.
Can somebody please point me in the correct direction? My objective is to obtain a stable input signal isolated from the harsh voltage changes in the coil.
Thank you
I have however found myself stuck at the very start.
The signal to be used is provided by the vehicles coil -ve "low tension" terminal. This terminal is ideally suppose to go 12v, 0 ,12V ,0 ... etc as the points open and close for each cylinder fire.
However due to the high voltages generated by the coil the responce on the negative low tension circuit can experiance short large voltages impulses and resonance.
I want to design a circuit that would condition this signal to something manageble without spikes and resonance. just smooth 12V 0V or 5V 0V etc.
Can somebody please point me in the correct direction? My objective is to obtain a stable input signal isolated from the harsh voltage changes in the coil.
Thank you
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