MkII gear indicator with number one showing


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agedbikeman
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MkII gear indicator with number one showing

Post by agedbikeman »



I'm thinking of changing my screen name from "Aged Bikeman" to "Aged Nutcase"
Somtimes I think us over 70 year olds have too much time on their hands. Enough old git ramblings, many of you have seen my post of a step by step "how to build your own digital gear counter", well it bugged me that there was no No. 1 as the OEM gear position switch did not have a wire for No.1. so I set to work down the cellar workshop where I sat for 3 days, only surfacing to eat and drink and listening to Judge Judy while I worked, designing and building a circuit to detect no digits illuminated and switch on No1., well here it is.


It really works without fault, unless you happen to miss gear then it also displays 1, but always returns to the correct operation
It really works without fault, unless you happen to miss gear then it also displays 1, but always returns to the correct operation

Digits are lit by grounding the diplay wires, un-grounded wires emit 12v, so with no digits lit, all wires 0,2,3,4,5 have 12 volts, fed to a 5 input AND gate making it go to logic 1 which switches on a transistor to ground wire No1, so No1 lights, select neutral or any other gear and the And gate loses one input returning it to logic 0, only problem TTL is only 5v, hence the 5v regulators on each gate input and the VCC pin.
The .1uf caps were needed as ignition transients came up the line from the ecm making the digits flash but only when the engine was running, both pull up and pull down resistors were needed to prevent instability, pull up to fully extinguish the digits and pull down to make the gate inputs switch properly.

Chips, a transistor, diodes, capacitors, all this just to display 1st gear, makes about as much sense as designing a mainframe computer to detect if there's sugar in you tea.

Well there you have it, the latest design from "Aged Nutcase"



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DenverWinger
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Re: MkII gear indicator with number one showing

Post by DenverWinger »

You could've used 4000 series CMOS gates, if I recall they are happy at 5-15 volts. That would save a bunch of "three-legged" 7805 regulators....
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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agedbikeman
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Re: MkII gear indicator with number one showing

Post by agedbikeman »

Thanks for that, designed and built loads of circuits over the years but first time I've ever used logic gates, I'll look into that

Thanks

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WingAdmin
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Re: MkII gear indicator with number one showing

Post by WingAdmin »

DenverWinger wrote:
Mon Jun 22, 2020 6:38 am
You could've used 4000 series CMOS gates, if I recall they are happy at 5-15 volts. That would save a bunch of "three-legged" 7805 regulators....
I was going to make the exact same suggestion! They are sensitive to static though, you need to make sure things are protected and buffered on the inputs.

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agedbikeman
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Re: MkII gear indicator with number one showing

Post by agedbikeman »

Since denver winger mentioned that I did look, but could only find 2 input cmos gates, needing 5 inputs I think i'dve been 1 gate short, given the cost of the 78L05 regs $2 for 25 plus the fact it works reliably I think I made the right decision. My post was more humour than anything else, such a bunch of components for one digit. Had the ciruit been simpler and the design and build been quicker, what else would I have done with myself during lockdown :lol: :lol: :lol:

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DenverWinger
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1972 CL350 (1980-1988) sold
1978 Suzuki GS550 (1985-2005) sold
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Re: MkII gear indicator with number one showing

Post by DenverWinger »

Didn't they make a low-current version of the 7805 in a TO-92 package?
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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agedbikeman
Posts: 105
Joined: Tue Jun 18, 2019 3:41 pm
Location: Bruay la Buissiere, France
Motorcycle: 1995 GL1500 Aspencade with Insta trike
2014 Can-Am Spyder RT

Re: MkII gear indicator with number one showing

Post by agedbikeman »

Yes it's the 78L05 100ma, that's what I used, $2 for 25, I built it on veroboard, it's small enough to fit inside the shelter bridge next to the fader control. the whole unit with all guns blazing only consumes 61ma



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