Another troll

Started by Anonymous in sci.electronics.basics6 hours ago 2 replies

Seems to me that Commander kinsey is just another troll. Really makes me realize how much teenage boys act like teenage boys. Sure am glad I got...

Seems to me that Commander kinsey is just another troll. Really makes me realize how much teenage boys act like teenage boys. Sure am glad I got filters. Eric


Does a parrot's foot conduct electricity?

Started by Commander Kinsey in sci.electronics.basics16 hours ago 67 replies

My pet parrot has a habit of chewing wires but never got a shock. I tested her feet with a multimeter and it was over 20Mohms. My own dry finger...

My pet parrot has a habit of chewing wires but never got a shock. I tested her feet with a multimeter and it was over 20Mohms. My own dry finger is 1Mohm. Are they safe from shocks due to scaly feet?


Problems with 12V and 5V lines on a PC ATX supply

Started by Commander Kinsey in sci.electronics.basics3 days ago 34 replies

Why do (cheap? expensive ones may be better) PC ATX power supplies need current drawn from the 5V line to make the 12V line work correctly? I...

Why do (cheap? expensive ones may be better) PC ATX power supplies need current drawn from the 5V line to make the 12V line work correctly? I have a PC with 3 graphics cards running scientific applications. I acquired three old graphics cards that take about 300W each, and have loads of cheap (CIT) PSUs that are rated at 650W on the 12V line, which is what those cards use. So I run each card ...


Wireless phone charger

Started by Steve Wolf in sci.electronics.basics4 days ago 5 replies

Just for fun I thought I would make a wireless phone charger. I'm not reall= y going to use it but I wanted to build it and just see if it...

Just for fun I thought I would make a wireless phone charger. I'm not reall= y going to use it but I wanted to build it and just see if it actually work= ed. The circuit uses two coils and a 2n222 transistor very simple. Well I can't really get it to work maybe I could get half a volt maybe to p= ast through induction. Then it seems to stop. I connected my meter to the r= eceiving coil to t...


555 pin3 output

Started by RobH in sci.electronics.basics1 week ago 4 replies

I've been trying out a couple of Automatic Fence Lighting circuits with a 444, 741 and ldr. I posted earlier about the circuits above , and...

I've been trying out a couple of Automatic Fence Lighting circuits with a 444, 741 and ldr. I posted earlier about the circuits above , and the problem I had was that I could not get a buzzer to work from pin3 of the 555. I came across this https://www.electronicshub.org/how-555-timer-ic-testing-circuit-works/ and found that out of x3 555's I had which I thought were faulty, only 1 ...


Schmitt Triggers

Started by RobH in sci.electronics.basics1 week ago 32 replies

I have been looking at schmitt trigger circuits and didn't realise how many variations there are. Anyway I found this...

I have been looking at schmitt trigger circuits and didn't realise how many variations there are. Anyway I found this one: https://reviseomatic.org/help/2-radio/Schmitt%20Trigger%20Light%20Sensor.php The author here says that by adding a 22k resistor to the bottom diagram turns into a schmitt trigger circuit as the top diagram. From other schmitt trigger circuits I have see on yout...


The Triumph of Dedicated Solutions Over Double Duty; How Much Is Electronics Indirectly Influencing Mechanical Design?

Started by Bret Cahill in sci.electronics.basics2 weeks ago 6 replies

There are other factors at work here. In the late 19th Century and much of= the 20th Century they didn't always have the money or tools for...

There are other factors at work here. In the late 19th Century and much of= the 20th Century they didn't always have the money or tools for more sophi= sticated designs requiring more components so mechanical design relying on = dove tails, i.e, using the rims of a bicycle wheel for the brakes instead o= f a dedicated disk rotor, seemed justified. This is in stark contrast to the way elec...


AoE 3rd Ed heavy discount on Amazon UK

Started by Adrian Caspersz in sci.electronics.basics3 weeks ago 9 replies

A UK heads up, https://www.amazon.co.uk/Art-Electronics-Paul-Horowitz/dp/0521809266 Hardcover, sold direct from Amazon, £23.50 You...

A UK heads up, https://www.amazon.co.uk/Art-Electronics-Paul-Horowitz/dp/0521809266 Hardcover, sold direct from Amazon, £23.50 You Save: £42.49 (64%) I had the first edition at college, and sold it on to a new student. Second edition came out, I was still broke so hunted down an old first on eBay. For me third edition now on the way :) BTW The companion "Learning the Art ...


Measuring Accuracy: 1.0 grade

Started by Bob Engelhardt in sci.electronics.basics3 weeks ago 3 replies

An Amazon meter is described as having "Measuring Accuracy: 1.0 grade". I found that there is a standard that defines the grades, but is there a...

An Amazon meter is described as having "Measuring Accuracy: 1.0 grade". I found that there is a standard that defines the grades, but is there a simple answer to what "1.0 grade" means in percentage? (I know how difficult it can be to extract simple answers from standards.)


Retro Button Would Further Automation On the Boeing Max & Everything Else That Seems Sophisticated Beyond the Intelligence of Designers

Started by Bret Cahill in sci.electronics.basics3 weeks ago 51 replies

Put a retro or "my kingdom for a horse" switch on anything that seems unnecessarily over automated or when the additional sophistication is of a...

Put a retro or "my kingdom for a horse" switch on anything that seems unnecessarily over automated or when the additional sophistication is of a minor advantage. If anything doesn't seem perfect, tap the retro switch and you are back to flying by the seat of your pants or at least something that is less complicated / more proven technology. It may seem counter intuitive but this would actual...


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