Any of you EE types out there know of a simple single supply DC
inverter amp?
Here is what I am thinking. It is working but not optimized yet. I am
working on a simple hardware solution to using the ignition with
existing EFI computers controlling engines.
Paul Lamar
12V to 5V? You can use a Cigaret lighter to USB converter for it.
Standard output is 500mA on 5V.
Henry
I can use a 5 v regulator on the board but I don't need a lot of
current CMOS parts
In order to adapt LI multi strike ignition to an existing RX8
computer controlled ignition over a wide RPM rangeI need a variable
period trigger so I always get six sparks regardless of the engine
rpm. That implies a voltage to frequency converter. Now I need to
vary that voltage with RPM. For higher RPM higher voltage. No
problem! Accumulate constant width pulses in a large capacitor. It is
called an analog tach circuit.
The voltage to frequency converters I found on the market so far are
more complicated than I desired so I invented one based on the ever
versatile CMOS 555. It worked far beyond my greatest expectations.
Here it is along with some of the other circuits. I fell off the
work bench again just like what happened when I discovered the ign
circuit :)
Of courses all this can be done with a microcomputer but where is the
challenge in that :)
Paul Lamar
As another member commented; that opto is very nonlinear. Also its
going to be subject to wide temp variations and the those type of
parts have wide tolerances in the current transfer ratio. If you want
isolation and accuracy, use an iso amp.
Robert LeClercq
Yes, along with the desired transfer ratio, please specify how stable
this has to be with changes in supply voltage, temperature, etc. One of
my mentors had a maxim: one good opamp is worth a thousand lines of code
... it's still true.
David Josephson
Here is the preliminary schematic. Hopefully this will work with the RX8
and Tracy's ignition as well a Neal's Microtech. Just about any computer
controlled ignition coil on plug. I am thinking of building it in.
Should work on 2nd and third RX7 engines.
What do you guys think? Got any suggestions for improvements?
Paul Lamar
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