INFANEM the driving notion clone

[imJonWain]

Cool, I'm looking it over now and I'll start going tomorrow morning.

[imJonWain]

any chance you can read the markings on the SMT transistors? Are they all J201s? Also it is possible to get a shot of the side that looks to be VCC rails and bias rail so I can sort out those traces? Funky routing.

[eatyourguitar]

I'm on my way to the shop now. I have a microscope there. professional. brb.

[eatyourguitar]

sot23 is a 3 terminal device. there are 4 of them. 2 are 2N2222 although that is not %100 confirmed. that is what the internet says it could be. case code looks like "1P 6" on the suspected 2N2222.

[eatyourguitar]

ok 7 sot23 sorry didn't see those over there tunnel vision from the microsope. some of them are not 2N2222. I wonder if it is more j201? that would explain why they hacked in a through hole j201 to sot 23 pad in exactly one spot. so if there are lets say 2 of 2N2222 and the through hole part was meant to be a sot23 then up to 6 j201. unlikely. more likely those are small signal diodes 914 4148 BAT87 etc.. I might have to actually do some work on this thing to verify all the unknowns. haven't tried light blasting it yet. I don't know if I have a powerful enough light. saw it done on youtube.

[imJonWain]

Yeah, the routing is hard to make out since they run so many traces under components. I started just labeling all the component types and values I could as the board is laid out on paper. Do you use Kicad or Eagle? I can move the stuff into one of those formats and we can share via GIT if you want. The light blast is a good idea.

[eatyourguitar]

I will do my best to give you component values in the next few days. I can decode 101 -> 10K for you. I will diode test the sot23 to identify which ones are diodes or bjt or fet. whatever we don't figure out on the first pass, I will check point to point with the multimeter.

blue wire is V- white wire is V+.

[imJonWain]

Cool, I've got a fair amount drawn out on paper. Just waiting on your info and maybe a better straight down photo so I can see some traces easier.

[eatyourguitar]

I did that with photoshop. you use the free transform tool. also called perspective. I just did one for myself to make a washed out greyscale background enlarged to 8.5 x 11 paper. I'm going to use the microscope to %100 finish the visual inspection and annotation today. I just draw directly on the picture and scan that back to you.

I can totally make projections for you that square it up. first I need to go do this thing writing down values. then I will get you that flat projection.

[eatyourguitar]

I have uploaded more pictures to the Google drive. I got all the values for the resistors and the tantalum caps. All sot-23 packages are 3 terminal devices (transistors). All vias have been identified. Ceramic caps can be separated by color and thickness. I do not have an LCR meter for ceramic caps. Not sure if I need to buy one. There are 8 total transistors. There is one through hole germanium diode. No opamps. I wonder what this is all about. I haven't completely ruled out the possibility of two diodes in a sot-23 three terminal device. If that is true then there are only two of those. Then 5 2N2222 1 FET.

[eatyourguitar]

I ordered one of these https://www.aliexpress.com/item/32784894105.html

[eatyourguitar]

I input all the resistor values. check the google drive. I will give you a more high quality picture of the traces. I still need to solder bond wires to the 3 terminal devices. I still need to measure the capacitors.

[goroth]

Keep it up dudes, this is amazing!

[imJonWain]

I'll work on it some more tomorrow and get a kicad or Eagle schematic going.

[eatyourguitar]

yeah I forgot to upload the high quality professional photos. I had them the whole time but I lost them. they are there now.