Through Board Desoldering High Melting Point Solder

Started by Bret Cahill in sci.electronics.basics5 days ago 4 replies

The power wires for a 500 watt ebike motor go through the board. It there any off the shelf insulator designed to protect the caps and other...

The power wires for a 500 watt ebike motor go through the board. It there any off the shelf insulator designed to protect the caps and other components only 13 mm away? This is asking for a torch. Bret Cahill


MCU reset during relay switches ON

Started by Niresh in sci.electronics.basics2 weeks ago 7 replies

Hi, Could any please suggest how to avoid MCU reset with voltage glitches/noise during relay switches ON. I have protected the relay coil with...

Hi, Could any please suggest how to avoid MCU reset with voltage glitches/noise during relay switches ON. I have protected the relay coil with free wheeling diode and MCU with 2x10uF parallel with 100nF near VDD of MCU and 1uF across RESET pin. Regards, NiK


Experiment to show that current leads voltage by 90 degrees in capacitor (Using RC circuit and Oscilloscope)

Started by Anonymous in sci.electronics.basics2 weeks ago 7 replies

Many books told me that current leads voltage by 90 degrees in capacitor. So, I designed an experiment to show that it is true. You can do the...

Many books told me that current leads voltage by 90 degrees in capacitor. So, I designed an experiment to show that it is true. You can do the experiment at home or in the laboratory. Here is my experiment in youtube: https://www.youtube.com/watch?v=wjQsyLv0X7A


"Technology Is Directional" <=> "Low Hanging Fruit Everywhere"

Started by Bret Cahill in sci.electronics.basics2 weeks ago 4 replies

It's easy for a lazy thinker -- that's everyone in some respect -- to get d= istracted from the possible by studying thermodynamics which focuses...

It's easy for a lazy thinker -- that's everyone in some respect -- to get d= istracted from the possible by studying thermodynamics which focuses on the= impossible. Obviously the "cardinality" of the set of impossible things i= s > > than the set of the possible so you save an infinite amount of time ju= st by being aware of the impossible. You definitely need the basics to imp= rove your


Error of % + digits?

Started by Commander Kinsey in sci.electronics.basics3 weeks ago 134 replies

I just bought an amp clamp meter, and it states the error is "+/- 1.9% + 3 digits". What does the "3 digits" part mean?

I just bought an amp clamp meter, and it states the error is "+/- 1.9% + 3 digits". What does the "3 digits" part mean?


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

Started by Bret Cahill in sci.electronics.basics3 weeks ago 9 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...


Subwoofer help

Started by AK in sci.electronics.basics1 month ago 5 replies

I would like to add a sub-woofer to my home theater system. My system calls for speakers in the 6 -> 16 ohm range. When I searched Ebay, I...

I would like to add a sub-woofer to my home theater system. My system calls for speakers in the 6 -> 16 ohm range. When I searched Ebay, I found some speakers, but found out that they need a crossover. My system has an output for a subwoofer. Could someone show me a link to something for sale or else the specs I need to look for? Thanks, Andy


Splattering solder into eye?

Started by Peter Hucker in sci.electronics.basics1 month ago 51 replies

Has anyone ever actually been unlucky enough to get solder splattering into their eye? I've had it hit my leg, hand, and face, but never in my...

Has anyone ever actually been unlucky enough to get solder splattering into their eye? I've had it hit my leg, hand, and face, but never in my eye. How bad is it? -- http://www.petersparrots.com http://www.insanevideoclips.com http://www.petersphotos.com Confuscious say: "War doesn't determine who's right. War determines who's left."


how to reduce the mains voltage

Started by default in sci.electronics.basics1 month ago 26 replies

I have an older window air conditioner that I'd like to hang on to for a few more years. The name plate says it is 220 VAC and since the power...

I have an older window air conditioner that I'd like to hang on to for a few more years. The name plate says it is 220 VAC and since the power company went through and upgraded the distribution network and replaced HT and transformers my service which had been running 210-220 volts is now a steady 250 volts and my bill is up ~15%. The increased consumption is tied to how much I run the AC ...


results of AC buck tranny

Started by default in sci.electronics.basics1 month ago 8 replies

I wired a 24VAC transformer to my Air Conditioner to lower the incoming line voltage to 220 from ~250 VAC. The old AC was pulling 2100+ watts...

I wired a 24VAC transformer to my Air Conditioner to lower the incoming line voltage to 220 from ~250 VAC. The old AC was pulling 2100+ watts worst-case and went to 1700, with the added transformer. Other observations: It uses ~1500 in the mornings when the differential between inside and out is close (all readings with the compressor running). During the day when the power was up ...


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