Drawings, Diodes and Capacitor questions
Hello all.
I haven't done much with the engine this past week but I did manage to diagram a couple different versions of the bench-top demonstration unit. (see attached)
I have always had some issues with this particular setup either misfiring or relay contacts sticking even with just an 80mfd capacitor which is why I am running a 47mfd capacitor at the moment so it doesn't always provide quite enough discharge so system 'misfires' sometimes. It's a catch 22 situation because smaller capacitor not quite enough so it misfires sometimes and larger capacitor tends to make relay contacts stick so it misfires anyway.
The original build of this unit has a pretty light duty relay with contact ratings at only 10 amps 30vdc so I intend to beef up this relay with one rated at 30 amps.
And I intend to just use cheap off-the-shelf auto parts as much as possible for best availability and easy to replicate by replacing the 555 velman timer kit with a turn signal flasher and a SPDT relay.
I can actually get five of these relays, with pigtail harnesses for only $13.95 delivered:
http://www.amazon.com/gp/product/B005HFYE1O/
Then a three pin flasher is only $8.99 delivered.
http://www.amazon.com/gp/product/B008C9YJ6C/
These are really common auto parts that can be found at most auto parts stores and even a few department stores and truck stops.
Then I was thinking about the high voltage rectifier. I have a few of the 30KV 2 amp "ham radio" diodes but I have been working on microwave ovens for over 30 years and I remembered there actually is a heavier duty version of these appliance diodes that everybody has been using. This version of a microwave oven HV diode is rated at 16Kv and 2 amps and is only $8.41 delivered-
http://www.amazon.com/gp/product/B00HGALV4Q/
Questions for Aaron-
What is the type, capacitance and voltage rating of the capacitors you had used for your booster cap bank HV transformer?
I appear to be experiencing difficulty finding any reference to these component specifics in your videos and documents and specific part numbers would be nice.
For example; if I wanted to merely replicate your original lawn mower experiment without spending a lot of money on a CDI system, what are the specific values and part numbers for the components including the SCR, Diodes, Capacitors and Resistor bank and can you diagram it?
Also wondering-
Is there a specific reason for using polarity specific electrolytic capacitors?
I have microwave capacitors on the shelf and even though rated for "AC"; these capacitors will hold a static DC charge although, at around 1uf or less; capacitance is pretty low on those.
I do have what appears to be a motor capacitor rated at 4uf (440vac) and this produces a pretty good result in the same test bed so I have to wonder; why not try these types of non polarized, 'large can' capacitors?
Such as this-
http://www.amazon.com/gp/product/B00E6OPHFY/
Is it possible these may actually charge faster and be less of a load on the AC source for this test bed?
They are rated for AC but they will accept and hold a static DC charge and are certainly built for durability and I do wonder if they may actually charge and discharge a little faster compared to an electrolytic of similar values?
Just some thoughts anyway.
Kindest regards;
}:>
Hello all.
I haven't done much with the engine this past week but I did manage to diagram a couple different versions of the bench-top demonstration unit. (see attached)
I have always had some issues with this particular setup either misfiring or relay contacts sticking even with just an 80mfd capacitor which is why I am running a 47mfd capacitor at the moment so it doesn't always provide quite enough discharge so system 'misfires' sometimes. It's a catch 22 situation because smaller capacitor not quite enough so it misfires sometimes and larger capacitor tends to make relay contacts stick so it misfires anyway.
The original build of this unit has a pretty light duty relay with contact ratings at only 10 amps 30vdc so I intend to beef up this relay with one rated at 30 amps.
And I intend to just use cheap off-the-shelf auto parts as much as possible for best availability and easy to replicate by replacing the 555 velman timer kit with a turn signal flasher and a SPDT relay.
I can actually get five of these relays, with pigtail harnesses for only $13.95 delivered:
http://www.amazon.com/gp/product/B005HFYE1O/
Then a three pin flasher is only $8.99 delivered.
http://www.amazon.com/gp/product/B008C9YJ6C/
These are really common auto parts that can be found at most auto parts stores and even a few department stores and truck stops.
Then I was thinking about the high voltage rectifier. I have a few of the 30KV 2 amp "ham radio" diodes but I have been working on microwave ovens for over 30 years and I remembered there actually is a heavier duty version of these appliance diodes that everybody has been using. This version of a microwave oven HV diode is rated at 16Kv and 2 amps and is only $8.41 delivered-
http://www.amazon.com/gp/product/B00HGALV4Q/
Questions for Aaron-
What is the type, capacitance and voltage rating of the capacitors you had used for your booster cap bank HV transformer?
I appear to be experiencing difficulty finding any reference to these component specifics in your videos and documents and specific part numbers would be nice.
For example; if I wanted to merely replicate your original lawn mower experiment without spending a lot of money on a CDI system, what are the specific values and part numbers for the components including the SCR, Diodes, Capacitors and Resistor bank and can you diagram it?
Also wondering-
Is there a specific reason for using polarity specific electrolytic capacitors?
I have microwave capacitors on the shelf and even though rated for "AC"; these capacitors will hold a static DC charge although, at around 1uf or less; capacitance is pretty low on those.
I do have what appears to be a motor capacitor rated at 4uf (440vac) and this produces a pretty good result in the same test bed so I have to wonder; why not try these types of non polarized, 'large can' capacitors?
Such as this-
http://www.amazon.com/gp/product/B00E6OPHFY/
Is it possible these may actually charge faster and be less of a load on the AC source for this test bed?
They are rated for AC but they will accept and hold a static DC charge and are certainly built for durability and I do wonder if they may actually charge and discharge a little faster compared to an electrolytic of similar values?
Just some thoughts anyway.
Kindest regards;
}:>
Comment