There is only one confusing connection that I see. You should avoid connections at crossings. See below.Sorry for the poor quality of the schematic in the area of the connection dots. I still use a DOS CAD program, and have to open it in another to allow saving the schematic as an image. The second CAD program diddled the dots (actually pads) from a diameter of 60 mills way smaller, and increased the hole size from 2 mills up to more like 8.
That's my point. I was taught from the time I was in diapers that you never make a cross where you want a connection. It is too easy to misinterpret it. You should always jog one of the wires, as in the no cross drawing.Nope, that's a legitimate connection.
I may have to see if I can't remove some ambiguity from the schematic.
By golly, you're stubborn.For hand drawings, the loop over the crossing trace is certainly better. In the vast majority of schematics from outfits as professional as they come, the connecting dot is the accepted practice. In a CAD program, doing all those semicircular arcs is just way too much work. Plus the schematic capture app indicates connector dots.
Anyway, I increased the size of the pads for the connecting dots, so it's easier to interpret.
OK, I give up.Sheer habit. Done it that way for 30 + years. And my dots straight out of the CAD program are nice and unambiguous. But I do tend to jump over crossing wires drawing by hand.
I regularly cross non-contacting traces without a loop. I'm talking about 4-wire junctions.I plead not guilty to being an EE. But the prints to my old Univac computers used connector dots and did not jump non-contacting wires/traces. Got into bad habits from the beginning (1967).
Ha! I just dug out some of my old Heathkit schematics. They use connection dots and cross non-contacting traces with impunity. See? A lifetime of bad influence.
How difficult is it to make an RPM lockout? Say I wanted to make a 5000 RPM threshold where the circuit would not shift unless it was below that. Should I just measure the volts from the RPM signal at 5000 RPMs? Then how could I make something that would not DOWN shift unless it below that voltage?No. The relay contacts are not shown with any connection to the outside. They are just uncommitted contacts.
Adding a 7 segment decoder would give the display, as would several LED's. With LED's, you could also indicate park and neutral.
Please do not forget that there is no RPM lockout to prevent you from downshifting at an engine speed that will cause mechanical disassembly.
I guess a 7 segment decoder might add some bling, but your tachometer (or your ears) is really all you need.How difficult is it to make an RPM lockout? Say I wanted to make a 5000 RPM threshold where the circuit would not shift unless it was below that. Should I just measure the volts from the RPM signal at 5000 RPMs? Then how could I make something that would not DOWN shift unless it below that voltage?
Also, how do I go about adding in this 7 segment decoder? What terminals would go where?
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by Jake Hertz
by Jake Hertz
by Jake Hertz