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abraxolotlpsylaxis.bsky.social
Abraxolotlpsylaxis
@abraxolotlpsylaxis.bsky.social
22 followers 35 following 420 posts
interested in interesting stuff.
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abraxolotlpsylaxis.bsky.social
it took a while, but now I have completed my "NeoPower" daisy-chainable DC motor driver (WS8211 + DRV8251)

bastelstube.rocci.net/projects/MBS...
NeoPower board version 3c = daisy-chainable DC motor driver with Neopoxel control
November 2, 2025 at 7:02 PM
abraxolotlpsylaxis.bsky.social
Now I have built the board: Here is version 4 in different views
NeoPower board version 4 in three levels of construction NeoPower board version 4 mounted on the back side of a DC gear motor NeoPower board version 4 mounted on the back side of a DC gear motor NeoPower board version 4: Two DC motors daisy-chained
November 2, 2025 at 6:21 PM
abraxolotlpsylaxis.bsky.social
TV antenna wall plug from the old days when coaxial cables + connectors weren't the standard yet
old-fashioned wall plug for TV antenna
October 26, 2025 at 9:07 PM
abraxolotlpsylaxis.bsky.social
bei mir so:
schwarze Eidechse auf Betonmauer
October 23, 2025 at 12:29 PM
abraxolotlpsylaxis.bsky.social
#Bilderrätsel mit Abraxolotlpsylaxis, Teil 11:
(Lösung im ALT-Text)
Boxspringbett
October 23, 2025 at 12:22 PM
abraxolotlpsylaxis.bsky.social
Some years ago I built the same with an I2C controlled PWM chip and a different type of H-bridge, but the basic principle is the same.

bastelstube.rocci.net/projects/MBS...
Circuit board layout of the I2C Power Slave First prototype of the I2C Power Slave
October 6, 2025 at 4:38 AM
abraxolotlpsylaxis.bsky.social
I have designed a variant of this circuit that can be soldered directly to the back of a DC motor. With this board, you can simply daisy-chain all the motors on your roboter and control them with one single wire. Different motor types are supported.
NeoPower board version 4a
October 5, 2025 at 8:10 PM
abraxolotlpsylaxis.bsky.social
Vintage PC slot card (ISA 8 bit) with VGA output and full 256 kBytes video RAM. Didn't need a heatsink back then. I have no documentation what the DIP switches were used for, probably the image frequency or so.
Vintage PC slot card (ISA 8 bit) with VGA output and full 256 kBytes video RAM
August 5, 2025 at 6:22 PM
abraxolotlpsylaxis.bsky.social
Anyone remember the MSP430 Watch by Texas Instruments?

mycomfab.sakura.ne.jp/~qx5k-iskw/r...
Microcontroller development board with MSP430 + LCD display, can be worn as watch
July 12, 2025 at 5:07 PM
abraxolotlpsylaxis.bsky.social
#Bilderrätsel mit Abraxolotlpsylaxis, Teil 10:
(Lösung im ALT-Text)
hypothetisch (hypo-Teetisch)
July 12, 2025 at 6:09 AM
abraxolotlpsylaxis.bsky.social
#Bilderrätsel mit Abraxolotlpsylaxis, Teil 9:
(Lösung im ALT-Text)
dekadent
July 10, 2025 at 5:09 AM
abraxolotlpsylaxis.bsky.social
#Bilderrätsel mit Abraxolotlpsylaxis, Teil 8:
(Lösung im ALT-Text)
Störpegel
July 9, 2025 at 9:18 AM
abraxolotlpsylaxis.bsky.social
#Bilderrätsel mit Abraxolotlpsylaxis, Teil 7:
(Lösung im ALT-Text)
synthetisch (syn-Teetisch)
July 8, 2025 at 7:19 AM
abraxolotlpsylaxis.bsky.social
#Bilderrätsel mit Abraxolotlpsylaxis, Teil 6:
(Lösung im ALT-Text)
Banküberfall
July 7, 2025 at 8:14 AM
abraxolotlpsylaxis.bsky.social
#Bilderrätsel mit Abraxolotlpsylaxis, Teil 5:
(Lösung im ALT-Text)
Breakpoint
July 5, 2025 at 8:00 AM
abraxolotlpsylaxis.bsky.social
#Bilderrätsel mit Abraxolotlpsylaxis, Teil 4:
(Lösung im ALT-Text)
Handgurke
July 1, 2025 at 4:33 AM
abraxolotlpsylaxis.bsky.social
#Bilderrätsel mit Abraxolotlpsylaxis, Teil 3:
(Lösung im ALT-Text)
Eisenmangel
June 30, 2025 at 4:26 AM
abraxolotlpsylaxis.bsky.social
#Bilderrätsel mit Abraxolotlpsylaxis, Teil 2:
(Lösung im ALT-Text)
Obstmesser
June 29, 2025 at 5:02 AM
abraxolotlpsylaxis.bsky.social
Bilderrätsel mit Abraxolotlpsylaxis, Teil 1
(Lösung im ALT-Text)
heuristisch
June 28, 2025 at 3:05 PM
abraxolotlpsylaxis.bsky.social
Here is an example ... plus teardrops on the vias ...
inside view of a vintage pocket calculator
June 25, 2025 at 7:02 PM
abraxolotlpsylaxis.bsky.social
There is still some logic in the malfunction. It looks like the 7 segment digits are split ... some segments are displayed where the digit should be and some are displayed on the leftmost digit. Inside the calculator you find only two DIL chips with 14 + 18 pins.
inside view of a vintage pocket calculator
June 25, 2025 at 6:57 PM
abraxolotlpsylaxis.bsky.social
Too bad ... I just tried it again, and it seems to be out of function. The display shows some weird patterns ...
June 25, 2025 at 6:45 PM
abraxolotlpsylaxis.bsky.social
I built a "hard" keyboard for my Spectrum about 40 years ago. Main keys were from a TI-99/4A, number key block was from an old SHARP desktop calculator and some extra function keys ... I can't recall where I got them from.
Handmade wooden box hosting a Sinclair Spectrum computer. It features a full alpha keyboard, a number block plus some extra function keys. Inside the wooden box, there's the Sinclair ZX Spectrum circuit board, a loudspeaker and a bunch of connectors. The keyboard matrix contacts from the Spectrum are wired to a 31-way connector at the top of the wooden box. Bottom view of the box lid with manual wiring of the keyboard matrix. The function keys are closing two contacts at once, in order to fulfill the Sinclair-style multiplex keyboard layout.
June 16, 2025 at 4:41 AM
abraxolotlpsylaxis.bsky.social
Until today I don't use the autorouter even if it's available. I use 45° corners wherever possible and sometimes even arcs around drill holes just for beauty reasons.
Cropped part of a circuit board design with bent tracks around a drill hole
May 27, 2025 at 7:49 AM
abraxolotlpsylaxis.bsky.social
I experienced a similar effect when taking photos of an LCD with an exposed chip-on-glass display controller chip. Each time when I made a photo with flash, the display contents would flip upside down. The flipping went fast enough that I always had the reversed display contents on my photo.
Circuit board carrying an LCD display with chip-on-glass technology. The region above the active display area is covered with white glue, inside it there's a thin grey rectangle. That's the display controller chip. It isn't protected against ambient light, therefore it always flips the display contents upside down when it's exposed to a bright camera flash.
May 24, 2025 at 5:03 PM