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



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