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Old 10-15-2007, 12:24 AM
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Default Re: MOD: All NAV Functions All The Time without Firmware Downgrade!

Great work AG4EVER!

I am familiar with etching PCBs but decided against it since it takes a lot longer and requires more supplies than just making the circuit from scratch. With my revised layout there are fewer jumpers needed and for those I just bend over the excess component leads and solder them to the next connection point. I also wanted a design that others could make easily if they had the soldering skills.

An important note for anyone trying this at home: my original design did use 2 capacitors, one of them on the output line which kept the output voltage close to 0 volts and created a negative pulse. This was picked up by my NAV unit just fine but after a few weeks the output capacitor went bad. It could have been due to a bad capacitor or it could have been the stress of the negative pulse / return voltage from the NAV. So just to be safe I removed the output capacitor and now the unit outputs ~12 volts and drops toward zero briefly for each pulse. My NAV still picks up the pulse just fine so I am going to update my install report and schematic soon with the new info.

And for all of you that want one of these but can't make it for yourself: I sold out of three batches in no time but I built a fourth batch due to all the PMs that kept rolling in and I still have a few of those left. These new units use the single capacitor design and have been tested extensively just like the others. PM me if interested and I will send you payment instructions then ship via priority mail the day after your payment arrives.
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WileETundra

view all of my 2007 Tundra mods and photos

Note: I receive many messages about the NAV Speed Pulse Generator so I continue to build them for people on request. If you want one then just PM me via this forum and include your email address.
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