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[professor]

Hi
Maybe  we need a second opinion here.
The Way I see it,but maybe I am not looking at it correctly so I"ll  explain.  The NP Capacitor charges up first through the least resistance that of the coil and if the voltage becomes greater than .75 volt  the diode parallel to the primary conducts to ground as it is forward biased now the Capacitor is fully charged negative on the primary side. If the scr is triggered then the voltage stored in the capacitor discharges through the scr to ground and the field in the transformer would collapse providing we had no diode here at all. If you were to protect the scr you would have to parallel the scr with your diode in opposite polarity as shown in your diagram in other words have the cathode facing opposite to that of the scr thus would protect the scr  from any spikes .
This is my point of view .I apologize if I am wrong. I inclosed a diagram not my own but if you look on the Net under strobe Light Circuits you will find this to be standard procedure.Maybe we both are right?
Professor

professor,

No, the BY255 is correct in the circuit drawing. The BY255 is used as a "free wheeling" diode to
protect the TIC106D from back emf voltage spike. Look at the circuit drawing again. The capacitor
will be charged with plus voltage facing the TIC106D. When the SCR fires the plus voltage will
go to the coil into the bottom. At this time the BY255 is closed. When the pulse fire is done the
coil will flip polarity (back emf voltage) and the BY255 will then open and take care of that.

Groundloop.

[Groundloop]

professor,

Not the same circuit. My circuit has the SCR wired a different way than in your circuit.
My circuit works correct and has been built, tested and used on a motor as a CDI system.

Groundloop.

[Groundloop]

bxngoc,

As promised. Here is the opto coupled version for interfacing to a PIC (or other micro controller).
This circuit power the micro controller from the 120 volt rail. Use only the components in the
drawing. No short cuts here! The SCR can be of any type as long as you change the value
of the two resistors around the SCR and opto (10K and 33K). The values in this drawing is for the TIC106D.

Please note that the ground line in this circuit is LIVE at 120 volt DC and the circuit must be built into
a plastic box to protect the operator. The circuit must be built onto a proper PCB. There must be just
one ground line going from the "live" circuit part to the digital part. Best point of ground connection is
at the Katode of the SCR.

The circuit has one external trigger input. This is for 5 volt TTL but if you change the 330 Ohm resistor then
any input pulsed voltage can be used. For 12 volt pulsed input the resistor value is approx. 1K.

If you have any questions then just ask.

Groundloop.

[Groundloop]

bxngoc,

Attached is a circuit for those of you that use a micro controller (mcu) with a built in A/D converter.
This circuit measure the voltage over the capacitor. The 0 - 120 V will be 0 - 4 volt at the
input of the mcu. The 5,1 volt zener is there for protection.

We take the guess work out by using a voltage sence network. Now the code in the mcu can be
very simple. Just measure the voltage and wait until the capacitor is fully charged. One can also
trigger before the cap is fully charged. Now the operator has no need to know the capacitor charge time.
And if the capacitor is changed, same goes. One great PIC that fits this circuit is the PIC16F88.
If you need a circuit drawing and code for this PIC, just ask.

Groundloop.

[Groundloop]

bxngoc,

Here is a circuit drawing with a PIC16F88 for the ignition circuit.
Now all you have to do is to write some firm ware to the PIC mcu.

1. Init
2. Measure if capacitor is charged up
3. No, goto 2
4. if input trigger then fire SCR
5. goto 2

Groundloop.