more incremental work on my “scratch build” DIY-USB microscope project…
melted zinc, cast it in into a short piece of round stock, 3 or more inches in diameter… for inexpensive “practicing” making the general shape of something i will make later out of aluminum stock.
practicing the shape on aluminum would be cost prohibitive, lol…
If you order the thin .8mm 2OZ boards from oshpark I have found they clear most retaining rings without the need for modifications. The retaining ring will just sit on top of the 7135’s. I do this for all of the 17mm drivers and any 20mm driver that might need the extra clearance. Larger then that and total strength can be an issue.
I figured out the Convoy BD06 driver that is a simple 105C driver just it has a charging circuit on the board which is working separately from the driver part. The only common thing in them that each part is connected with battery + and -. I made a pic of vias and wiring on driver.
According to this today or tomorrow I will try to flash it with Biscotti FW and I think it will work both driver and charging after all. And maybe stack on 2 or 3 AMC7135s.
I sent to CRX. I don’t know about the replacing of ATTiny. I didn’t tried to flash it.
Sadly I can not see TLF pictures because i’m not a member and I don’t understand german.
Nice investigation, Zozz. As mentioned, you might want to double check that MCU. From the picture, I don’t see any of the writing on it that is typical of the attiny’s. I’ve never tried flashing a generic MCU, dunno how it goes.
Sure, it’s fairly straightforward.
I found where the bat+ comes into the board on the components side and took a 30awg to a 1206 1k resistor soldered to a 1206 green LED and mounted it next to the switch with clear resin, keeping in mind clearances for reinstalling into the pill.
The LED- is another 30awg wire soldered to the brass driver ring.
The original switch cover i destroyed ages ago so this one is a piece of 4mm translucent rubber placed over the electronic button then poured in silicone half way in the well, refitted alu ring, let dry then made a mix of a tiny amount of graphite powder with clear silicone and topped off.
Put a piece of clear tape over the switch first so it doesn’t get jammed up.