Poul’s Friend
@poulsfriend.bsky.social
Pic from National Geographic, October 2017.
I have a tube VOM with a battery in it that must be 50 years old. At first I worried, and then I stopped.
November 2, 2025 at 11:50 PM
I have a tube VOM with a battery in it that must be 50 years old. At first I worried, and then I stopped.
Isn’t it weird how you have to take batteries out of everything now? Maybe we should go back to zinc carbon?
November 2, 2025 at 11:48 PM
Isn’t it weird how you have to take batteries out of everything now? Maybe we should go back to zinc carbon?
It is stupid. But gotta make a profit.
November 1, 2025 at 10:21 PM
It is stupid. But gotta make a profit.
Definitely. Look at the crap kerning on the right! Jeez.
November 1, 2025 at 9:08 PM
Definitely. Look at the crap kerning on the right! Jeez.
You could widen the board and route outside the pins. Maybe?
November 1, 2025 at 7:45 PM
You could widen the board and route outside the pins. Maybe?
Any chip can be a fuse, if used properly.
October 30, 2025 at 12:19 PM
Any chip can be a fuse, if used properly.
But what if you are??
October 28, 2025 at 11:36 PM
But what if you are??
Theory of Mind chat.
October 28, 2025 at 7:10 PM
Theory of Mind chat.
Electronix Express
“840 tie point premium solderless breadboard with mounting holes”
SKU: 03MB901
“840 tie point premium solderless breadboard with mounting holes”
SKU: 03MB901
October 27, 2025 at 12:53 AM
Electronix Express
“840 tie point premium solderless breadboard with mounting holes”
SKU: 03MB901
“840 tie point premium solderless breadboard with mounting holes”
SKU: 03MB901
Positives:
• Consistent insertion and hold.
• Integrated bus rails.
Neutral:
• Mounting holes.
• Bus rails split — no indicator.
Negatives:
• Odd bus spacing! Rails 3.6mm apart, and 7.7mm from array. So power modules won’t fit.
• Kinda pricy: $7.45US each.
• Consistent insertion and hold.
• Integrated bus rails.
Neutral:
• Mounting holes.
• Bus rails split — no indicator.
Negatives:
• Odd bus spacing! Rails 3.6mm apart, and 7.7mm from array. So power modules won’t fit.
• Kinda pricy: $7.45US each.
October 27, 2025 at 12:50 AM
Positives:
• Consistent insertion and hold.
• Integrated bus rails.
Neutral:
• Mounting holes.
• Bus rails split — no indicator.
Negatives:
• Odd bus spacing! Rails 3.6mm apart, and 7.7mm from array. So power modules won’t fit.
• Kinda pricy: $7.45US each.
• Consistent insertion and hold.
• Integrated bus rails.
Neutral:
• Mounting holes.
• Bus rails split — no indicator.
Negatives:
• Odd bus spacing! Rails 3.6mm apart, and 7.7mm from array. So power modules won’t fit.
• Kinda pricy: $7.45US each.
BTW, I found good breadboards.
October 26, 2025 at 6:03 PM
BTW, I found good breadboards.
Courtesy the crab cavities?
October 23, 2025 at 1:26 PM
Courtesy the crab cavities?
Click and Clack said one way to make drivers behave would be to mount the driver seat on the front bumper.
October 17, 2025 at 6:42 PM
Click and Clack said one way to make drivers behave would be to mount the driver seat on the front bumper.
It’s the comparator flip. Note pin 1 and pin 7 with no bypass, vs with 10u of bypass (at chip pins):
October 12, 2025 at 1:29 AM
It’s the comparator flip. Note pin 1 and pin 7 with no bypass, vs with 10u of bypass (at chip pins):
Top = pin 3, bottom = pin 7.
October 6, 2025 at 1:13 AM
Top = pin 3, bottom = pin 7.
Thanks! The comparators do draw a lot when they switch. But I wonder about the delay between the bump and the slope. I will compare the timing to that of pin 3.
October 6, 2025 at 12:49 AM
Thanks! The comparators do draw a lot when they switch. But I wonder about the delay between the bump and the slope. I will compare the timing to that of pin 3.
This is what I measured:
October 5, 2025 at 4:51 PM
This is what I measured:
Yes all 10 of them.
Note the waveform pic is pin 7 with pullup. I’ve found I get a clean(ish) edge from pin 3. Bonus, no longer need the pullup!
Note the waveform pic is pin 7 with pullup. I’ve found I get a clean(ish) edge from pin 3. Bonus, no longer need the pullup!
October 4, 2025 at 4:37 PM
Yes all 10 of them.
Note the waveform pic is pin 7 with pullup. I’ve found I get a clean(ish) edge from pin 3. Bonus, no longer need the pullup!
Note the waveform pic is pin 7 with pullup. I’ve found I get a clean(ish) edge from pin 3. Bonus, no longer need the pullup!
I see that I got these off Amazon so maybe you’re right…
October 3, 2025 at 7:05 PM
I see that I got these off Amazon so maybe you’re right…
Pin 4 is already tied high. But pin 5 is floating; maybe crosstalk there? I’ll check that.
October 3, 2025 at 6:48 PM
Pin 4 is already tied high. But pin 5 is floating; maybe crosstalk there? I’ll check that.