the center part is almost identical to 22mm, some parts have a little more space between em like the bleeder

you can reduce it to about 24mm and still got some copper ring around

350mA

Getting in the final stage of ordering the parts

first 6 Oshpark boards and 200 AMCs arrived yesterday

today a big part of Oshpark boards arrived

just amazing how tiny a 17mm driver looks compard to 46mm

BUT
3 of the 22mm LDO bards came without contact ring on the MCU side
and 3 46mm SRK without the contact ring on the retaining ring side,
just removing the paint with a knife or chemical will work

I will contact Oshpark to get replacements for them,
but it should not be a big deal to use em, only if you got no problem with it
or you got to wait another 3 weeks

Please everyone check if the data in the Excel sheet is what you want, I will build what is listed there

Parts from Digikey will get ordered today

Batch is limited to 58 drivers by the SIR800 FET

2 Backup MCUs ordered in case one is faulty like last batch so probably 60 possible with IFR or LF PAK33 (15mm)

43 drivers are taken 2 pending feedback

Agro wrote:

I’d like 2*17mm. Max number of 7135. It can go without firmware, I want flash my own Bistro-based image anyway.

I will flash it for testing the driver anyway, of course you can send me your custom hex file

Standard TA Bistro or HD OTSM?
OTSM has more expensive parts but no more issues with hot light and OTC timing getting almost unusable
springs?

more boards from Oshpark
sorted by size

ordering from Digikey tomorrow

So I made some minor changes to the Bistro OTC board using a high quality 0805 capacitor with low temperature shift and only 5% tolerance this should get better than the standard X7R 0603 one when the light gets hot

https://www.digikey.com/product-detail/en/kemet/C0805C105J8NACTU/399-576...

also on ordering the parts I looked around and checked if there is a better 47uF tantal capacitor and I found that Flintrock pretty much choose the most expensive on market, getting another brand with identical specifications drop the price by 1$
as I got also over 10 of those capacitors price dropped also

the question is if I can use this new capacitor and save almost 1.5$ to the first Bistro OTSM material calculation, getting you a partial refund on the paypal transaction?

Agro wrote:

OK, I educated myself on Bistro-HD OTSM. Definitely looks like the thing, but I need a clarification. The firmware’s thread mentions that it needs ATtiny85 revision C. It reports that all trial to find it failed. Did you manage to find it?

Bistro HD OTSM runs on Attiny 25V

extra parts price for HD OTSM dropped to 1.5$ as I did change the capacitor brand with same specifications and are above 10 parts Digikey lower prices as well
0.92$ vs original calculation of 2.23$ for the capacitor

for 0.5$ more I can order 45V I am ordering later today