WORK FROM HOME. I load BTC wallets. NO UPFRONT FEE!

Started by Anonymous in sci.electronics.basics3 months ago

I load Bitcoin wallets, Recover lost Bitcoins, & help with FOREX / BITCOINS Investments. For more info text or send me a message via WhatsApp - ...

I load Bitcoin wallets, Recover lost Bitcoins, & help with FOREX / BITCOINS Investments. For more info text or send me a message via WhatsApp - +1 (424) 261 8158 Instagram @kentsungle I am Kent Sungle Administrator at Block Chain


Another troll

Started by Anonymous in sci.electronics.basics3 months ago 40 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


Speaking of 555s...

Started by Anonymous in sci.electronics.basics4 months ago 10 replies

Recently I added an air cylinder to a manual lathe that opens the half nut when threading by moving the proper lever. For those who don't...

Recently I added an air cylinder to a manual lathe that opens the half nut when threading by moving the proper lever. For those who don't know a manual lathe that can cut threads has a leadscrew that drives the carriage along the ways when a split nut-the half nut-is clamped around the leadscrew. When the carriage has traveled the desired distance the half nut must be disengaged. Th...


Transistor testing

Started by RobH in sci.electronics.basics4 months ago 15 replies

I have some BC547 transistors which I want to use in a circuit, but according to this: Hook the positive lead from the multimeter to the to...

I have some BC547 transistors which I want to use in a circuit, but according to this: Hook the positive lead from the multimeter to the to the EMITTER (E) of the transistor. Hook the negative meter lead to the BASE (B) of the transistor. For an good NPN transistor, you should see ?OL? (Over Limit). If you are testing PNP transistor, the meter should show a voltage drop between 0.


Does a parrot's foot conduct electricity?

Started by Commander Kinsey in sci.electronics.basics4 months ago 73 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.basics4 months ago 35 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 months 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.basics4 months 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.basics5 months 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...


AoE 3rd Ed heavy discount on Amazon UK

Started by Adrian Caspersz in sci.electronics.basics5 months 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 ...


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