Rue Mohr
@ruenahcmohr.bsky.social
Rue Mohr, Recreational Technologist. Robotics: Electronics, Programming, Mechanics.
Not retro, but Z80 is the best of all time.
Not retro, but Z80 is the best of all time.
Morning random image, I'm still home sick...
from 2021, servo control on the tilt and pan mirror.
from 2021, servo control on the tilt and pan mirror.
November 26, 2025 at 9:49 PM
Morning random image, I'm still home sick...
from 2021, servo control on the tilt and pan mirror.
from 2021, servo control on the tilt and pan mirror.
Hmm, scrounging parts from some medical machines that use 5 phase motors. Interesting mystery, they only use low side drivers for 5 totem poles... do they just drive the high side FETs 15V over the high power rail?
November 26, 2025 at 5:05 AM
Hmm, scrounging parts from some medical machines that use 5 phase motors. Interesting mystery, they only use low side drivers for 5 totem poles... do they just drive the high side FETs 15V over the high power rail?
well I'm usually going into a 10 bit ADC, but honestly, usually I'm just using a consumer grade pot on a mechanism. I have 2 current targets both linear
One for a mini actuator (4cm)
Another for my tilt and pan mirror (9cm)
One for a mini actuator (4cm)
Another for my tilt and pan mirror (9cm)
November 26, 2025 at 5:03 AM
well I'm usually going into a 10 bit ADC, but honestly, usually I'm just using a consumer grade pot on a mechanism. I have 2 current targets both linear
One for a mini actuator (4cm)
Another for my tilt and pan mirror (9cm)
One for a mini actuator (4cm)
Another for my tilt and pan mirror (9cm)
Morning random image!
oh, heh, hmm ok. sure
oh, heh, hmm ok. sure
November 25, 2025 at 9:24 PM
Morning random image!
oh, heh, hmm ok. sure
oh, heh, hmm ok. sure
and one photo of a bunch of smd, cause, images should occur in powers of a 2 base.
November 25, 2025 at 9:20 PM
and one photo of a bunch of smd, cause, images should occur in powers of a 2 base.
hey!
Lets try this...
Rues Nov 2025 Transistor Challenge!
See if you can make the most minimal circuit in the middle that performs the function!
Here, its an up/down binary counter.
I have an idea how to do it that I will attempt, do you have an idea? reply with it!
Lets try this...
Rues Nov 2025 Transistor Challenge!
See if you can make the most minimal circuit in the middle that performs the function!
Here, its an up/down binary counter.
I have an idea how to do it that I will attempt, do you have an idea? reply with it!
November 25, 2025 at 5:03 AM
hey!
Lets try this...
Rues Nov 2025 Transistor Challenge!
See if you can make the most minimal circuit in the middle that performs the function!
Here, its an up/down binary counter.
I have an idea how to do it that I will attempt, do you have an idea? reply with it!
Lets try this...
Rues Nov 2025 Transistor Challenge!
See if you can make the most minimal circuit in the middle that performs the function!
Here, its an up/down binary counter.
I have an idea how to do it that I will attempt, do you have an idea? reply with it!
Here is a demo reel for that circuit :]
looking good!
looking good!
November 25, 2025 at 4:05 AM
Here is a demo reel for that circuit :]
looking good!
looking good!
later I gave this circuit a try, its from
@killnotsees on twitter. This circuit does binary-to-1-of-4 decoding, with 3 transistors.
Thats my kinda circuit! ;]
@killnotsees on twitter. This circuit does binary-to-1-of-4 decoding, with 3 transistors.
Thats my kinda circuit! ;]
November 25, 2025 at 4:04 AM
later I gave this circuit a try, its from
@killnotsees on twitter. This circuit does binary-to-1-of-4 decoding, with 3 transistors.
Thats my kinda circuit! ;]
@killnotsees on twitter. This circuit does binary-to-1-of-4 decoding, with 3 transistors.
Thats my kinda circuit! ;]
Here is it in operation, the switching is really bad, so the leds kinda fade-in. The timing of the leds on the right can be adjusted by using a shottkey diode instead.
November 25, 2025 at 3:59 AM
Here is it in operation, the switching is really bad, so the leds kinda fade-in. The timing of the leds on the right can be adjusted by using a shottkey diode instead.
Interesting day, I woke up really ill, booked off sick for work and chewed into some electronics a bit. This is a light sequencer for a post about turning signal lights that keeps coming up in my feeds.
November 25, 2025 at 3:56 AM
Interesting day, I woke up really ill, booked off sick for work and chewed into some electronics a bit. This is a light sequencer for a post about turning signal lights that keeps coming up in my feeds.
morning random image
From this year, auto power failover.
I use this for when I have to replace my UPS (but keep my computer running)
From this year, auto power failover.
I use this for when I have to replace my UPS (but keep my computer running)
November 24, 2025 at 7:16 PM
morning random image
From this year, auto power failover.
I use this for when I have to replace my UPS (but keep my computer running)
From this year, auto power failover.
I use this for when I have to replace my UPS (but keep my computer running)
ok, I think I made this simple enough that even if I was asleep I could build it right.
its a wiring harness for a system to alternate my two septic system pumps.
its a wiring harness for a system to alternate my two septic system pumps.
November 23, 2025 at 11:39 PM
ok, I think I made this simple enough that even if I was asleep I could build it right.
its a wiring harness for a system to alternate my two septic system pumps.
its a wiring harness for a system to alternate my two septic system pumps.
I was working on a design for a linear position sensor yesterday, I was hoping this circuit would work out well, but it wasn't being linear with the variable inductor I made.
November 23, 2025 at 7:58 PM
I was working on a design for a linear position sensor yesterday, I was hoping this circuit would work out well, but it wasn't being linear with the variable inductor I made.
Who said DIY CCD?
With microcontrollers, it should be easy now.
With microcontrollers, it should be easy now.
November 23, 2025 at 7:03 AM
Who said DIY CCD?
With microcontrollers, it should be easy now.
With microcontrollers, it should be easy now.
The internet, when someone doesn't reply to a DM right away...
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V
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November 23, 2025 at 7:02 AM
The internet, when someone doesn't reply to a DM right away...
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V
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Hair dryer boiling water under a vacuum in plastic syringe.
By Rue Mohr
By Rue Mohr
November 23, 2025 at 5:26 AM
Hair dryer boiling water under a vacuum in plastic syringe.
By Rue Mohr
By Rue Mohr
a staircase generator that would be suitable for that graph circuit I was pondering. I don't need the rest or the input driver, so that sort reduces it to just the 1 transistor.
November 22, 2025 at 8:14 PM
a staircase generator that would be suitable for that graph circuit I was pondering. I don't need the rest or the input driver, so that sort reduces it to just the 1 transistor.
... a really wide analog display, and flat... outside the range of standard lcds. I was playing with laser scanning and it wasn't quite working out.
November 22, 2025 at 5:25 PM
... a really wide analog display, and flat... outside the range of standard lcds. I was playing with laser scanning and it wasn't quite working out.
@sad-electronics.bsky.social
if I wanted to make a really "high resolution" led strip, how close could I expect a PCBA to pack 0402 (imperial) LEDs?
do you think anyone could pull off 256/20cm?
if I wanted to make a really "high resolution" led strip, how close could I expect a PCBA to pack 0402 (imperial) LEDs?
do you think anyone could pull off 256/20cm?
November 22, 2025 at 7:21 AM
@sad-electronics.bsky.social
if I wanted to make a really "high resolution" led strip, how close could I expect a PCBA to pack 0402 (imperial) LEDs?
do you think anyone could pull off 256/20cm?
if I wanted to make a really "high resolution" led strip, how close could I expect a PCBA to pack 0402 (imperial) LEDs?
do you think anyone could pull off 256/20cm?
I suppose if you know your scan time is fixed, and the duty is always 1/10, you can use a series cap to just give you a pulse during the interval of the first hit.
November 22, 2025 at 6:52 AM
I suppose if you know your scan time is fixed, and the duty is always 1/10, you can use a series cap to just give you a pulse during the interval of the first hit.
I cant get this out of the back of my mind, the idea is that the 4017 strobes the leds, and the comparator triggers the display during the correct values. But I want dot mode. (this is bar mode)
I suppose I could also use a staircase generator, might sync better.
I suppose I could also use a staircase generator, might sync better.
November 22, 2025 at 6:37 AM
I cant get this out of the back of my mind, the idea is that the 4017 strobes the leds, and the comparator triggers the display during the correct values. But I want dot mode. (this is bar mode)
I suppose I could also use a staircase generator, might sync better.
I suppose I could also use a staircase generator, might sync better.
I have a thing for blinking clear LEDs tho...
(music is by @LOOKMUMNOCMPUTR again)
(music is by @LOOKMUMNOCMPUTR again)
November 22, 2025 at 6:17 AM
I have a thing for blinking clear LEDs tho...
(music is by @LOOKMUMNOCMPUTR again)
(music is by @LOOKMUMNOCMPUTR again)
It works too!
( LOOK MUM NO COMPUTER )
( LOOK MUM NO COMPUTER )
November 22, 2025 at 5:35 AM
It works too!
( LOOK MUM NO COMPUTER )
( LOOK MUM NO COMPUTER )
A 2->4 decoder using open collector inverters. :]
There was some inspiration for the sillyness from twitter.
There was some inspiration for the sillyness from twitter.
November 22, 2025 at 5:33 AM
A 2->4 decoder using open collector inverters. :]
There was some inspiration for the sillyness from twitter.
There was some inspiration for the sillyness from twitter.