Wednesday, July 28, 2010

Tektronix Oscilloscopes

In my travels, i've come across 2 Tektronix scopes on Craigslist and was lucky enough to pick them up for a song. The first for $75 and the second for free!

The first one is a Tek 465M model which was ruggedized for military purposes.

It's a bit dirty but should clean up well. It functions perfectly as far as I can tell and included 2 probes. The specs say that it's a 100MHz dual trace scope.

The second is a Tektronix 7704A scope that I picked up (Ugh) for free. It has a problem with the power supply which should be fun to track down and fix!

This scope is a beast and is built for a solid bench. It came with 5 modules. The spec sheet says that it's a 200MHz scope. I would guess that it's around 30 lbs. When you turn it on, the power supply ticks and does nothing else. The display supposedly works, but it doesn't do anything that I can see. The ticking is indicative of a bad capacitor on the power supply board. I will need to open it up and hope to see a burnt of misshapen cap. Wish me luck!


Friday, July 9, 2010

Near Future Plans

My Tidalforce S-750 build is now complete and fully up to speed, however, as with any engineering project, there are future upgrades that I plan to implement.

First item:
I have 10 Bosch Fat Packs, well actually 9 and 1 is a pack made from 20 Doctorbass recovered Sony/Konion 18650VT cells that I've assembled. It's actually quite small so the thought occurred to me fit the one BFP and one Doctorbass pack that I have into my rear Topeak bag so that I can have all the power that I need and minimize the voltage sag that I've experienced with my BFPs.

Second item:
I have received the GPS and will install it soon to verify my estimated 40 miles per hour top speed. Eventually, I plan to have it be powered from my BFPs.

Third item:
Tyler (a local bike enthusiast) has lent me 2 Meanwell 48V power supplies to modify. I need to acquire 3 or 4 1K 10 turn low power potentiometers so that I can turn the voltage down from the current 42V lower limit to something closer to 41.5V.

Fourth item:
Front headlight install. I would like to permanently install the two MagicShine MJ808 headlights to my bike and power it from the BFPs so that I don't have to worry about a separate battery pack for the headlights.

Fifth item:
I've purchased two more light bases and two more 300W utility bulbs to double the power of my LBD. That will stress the batteries more and reduce the amount of time necessary to test the pack. Right now at just over 300W at 72V, it takes about 3 hours to test the pack! I hope to reduce that significantly. The cost of the light sockets and bulbs was truly minimal at around $11.

Sixth, seventh, eighth items:
More as I can think of them! That's enough for now...


Tuesday, July 6, 2010

New 8 BFP 72V Load Test Results

I had a little bit of time tonight so put my new BFP pack on my new light bulb discharger to see how many AH it could deliver. After almost 3 hours, it came back as 8.3AH so it's a significant jump up from my 6.0AH from having 6 packs.

More later,

New Man Cave Accessory

I had a huge problem. My "Storage Closet" was getting tremendously crowded and there was no place to put anything except to pile them on the floor. My wife thought that a shelving unit would help greatly and she was right. I cleaned up everything and put it all on the new shelving unit in the closet. I spared you by not taking a picture of the mess before the cleanup.

Now there's room for more stuff in the Man Cave! :)

More later,