This is just a stub account. Follow @tnt for the real timeline . .

My experiment trying to run a Voodoo2 on a Raspberry Pi 5 . Still plenty of unanswered questions, so if any of you are ARM64 or PCIe experts, please chime in 😁.

Building a mini SDR with custom silicon. I combined a couple of projects from TT6 and TT7 and receive some FM modulated signals !. Go watch the video if that sounds cool :

Quick video of me going over the project I taped-out on TT09 to test/characterize the ROM:. 🤞 That it works 😁.

Second episode in my sky130 rom compiler adventures. I know, it's long overdue . sorry about that 😅. In this one, I'll dig into the bit cell design, trying to explain how and why I came up with the design.

Introducing a SKY130 ROM compiler project I've been working on for a while. This is just a quick intro to the project with following episodes diving into all the tech details of the design.

Trying out he youtube shorts format 😅.

Ok, well, I'll be trying this again in about 10 min. I have now stable sweep script so we can just run them and look at the results instead of debugging GPIB 😅.

Stream starting in 10 minutes (if all goes well🤞).

Forgot to say : 1930 CET . You can click on the link to see your local time, but should be 1030 PT and 1330 ET if my math is right 😅.

Live stream tonight at As part of board bring up, we will be testing some DC/DC converters using a SMU as load (efficiency, ripple, load transient or such). If this goes fast, maybe some op-amp circuit test.

No ! @latticesemi whyyyyyy ???.( old rap parody ECP5 promo video )

RT @LaF0rge: at @sysmocom we've been building a full-speed-only passive USB protocol tracer for a customer, form-factor compatible to the v….

I will be streaming #sky130 MPW-2 prototypes bring up attempt tonight at 20:00 CEST (check youtube for your local time).

Small error while writing the tweet here: It's 88k -> 1.7W. The 100C is correct though.

So huh . WTF ???. How are those not hidden faults warranting recall and replacement . .

(5) And because the power switch is not a mains power switch (it just toggles the soft control of the PSU module), the mains is present on all of theses all the time, 24/7 as long as the scope is plugged in, keeping all those parts very very hot.

(4) The resistors used in (1) and (2) are _just_ below the large reservoir cap for the switching converted (420V 100uF). Keeping it at around 90C. (note to @Keysight engineers, the 105C marking on the cap doesn't mean you should warm it up to that temp).

(3) The drop resistor used for the opto coupler to generate the "line trigger" signal is also rather low at 38 kOhm. Thermal cam shows it at a nice and warm 160C !!! On mine, the color band are all white now, discolored by heat. You can see original color on @eevblog pics.

(2) The startup resistors total only 66 kOhms and almost sees the full 400V too. They dissipate about 2.2W constantly, keeping them at a rather hot 100C !.

(1) The bleed resistors across the rectified mains (400V) is 200kOhms. That's 0.8W constant, heating those resistors to about 80C.