Alternator Output Drops Above 45 C After 75 km

Started by Bret Cahill in sci.electronics.basics2 years ago 38 replies

After 50 - 75 km driving the ignition system starts to fail. Pull over and wait 2 minutes and then another 50 km is possible _without...

After 50 - 75 km driving the ignition system starts to fail. Pull over and wait 2 minutes and then another 50 km is possible _without lights_. It's hard to imagine anything cooling off in just 2 minutes. There must be some thresh hold where the rectifier or voltage regulator is really sensitive to even small changes in temps. Bret Cahill


Re: how to bypass dremel tool internal variable speed control?

Started by Tinydikswinger in sci.electronics.basics2 years ago

replying to Claude Desjardins, Tinydikswinger wrote: 120 psi hell if you are running the HF junkers have some fun and give em @ 180 -190psi...

replying to Claude Desjardins, Tinydikswinger wrote: 120 psi hell if you are running the HF junkers have some fun and give em @ 180 -190psi ...They have a much diffrent sound at those pressures and the neighbors will all be over finding out jusy what the hell all that screaming is about. I usually run my high speed cutoffs and such that high but get good wheels because them Chinese garbage di...


Transformerless power supply

Started by amdx in sci.electronics.basics2 years ago 7 replies

Is it reasonable/possible to build an 8 amp 20 V transformerless power supply from a 120Vac line. I calculate about 180uf plus or minus...

Is it reasonable/possible to build an 8 amp 20 V transformerless power supply from a 120Vac line. I calculate about 180uf plus or minus depending on other components. Maybe 9- 20uf caps in parallel? I'd like to build it into a leaf blower. All plastic, absolutely no metal exposed. I think I've answered my question, I have 12, X rated caps in my junk box, but they are only 1uf....


Turn on Dynamic Range Compression

Started by AK in sci.electronics.basics2 years ago 3 replies

I am trying to turn on Dynamic Range Compression or D.COMP as Denon calls it. I got up to and finished step 5. But instead of going to step 6,...

I am trying to turn on Dynamic Range Compression or D.COMP as Denon calls it. I got up to and finished step 5. But instead of going to step 6, it went to step 8, Default Y/N. Step 6 is where you can turn on Dynamic Range Compression. I want to set Comp because of the tremendous dynamic range of movie soundtracks. Here are pictures of 2 pages of the manual. https://imgur.com/a/8tWUQv...


All Ob A Sudden, Starter Motors Is So Small & Light You Can Carry 'em Home In A Filmy Shoppin Bag

Started by Bret Cahill in sci.electronics.basics2 years ago 5 replies

Summin didn't look right. The replacement starter motor was 2/3rds the dia of the original, mebbe haf the wait. I tink, WTF? Weren't all them...

Summin didn't look right. The replacement starter motor was 2/3rds the dia of the original, mebbe haf the wait. I tink, WTF? Weren't all them optimum nummers well settled back in the early Nicolacene? I toght, heck, no need to strap it onto the bike rack. I'll just stick hit into a shoppin bag. Affer an easy installation, the thang _akutually werked._! Affer about 2 days a theory he...


Diagnosing speakers

Started by Andy in sci.electronics.basics2 years ago 16 replies

I have a 6 speaker home theater system. However the middle 2 speakers have no sound. I checked the voltages. 0 volts when a movie is...

I have a 6 speaker home theater system. However the middle 2 speakers have no sound. I checked the voltages. 0 volts when a movie is playing versus .22 Vdc when movie is not playing. Does that help at all? Thanks, Andy


Power in use indicator please ?

Started by Steve Wolf in sci.electronics.basics2 years ago 50 replies

I have a water pump in a remote location. Sometimes the pump (120 volts) line springs a leak and then runs all the time with the potential of...

I have a water pump in a remote location. Sometimes the pump (120 volts) line springs a leak and then runs all the time with the potential of burning out pump. I want to build a little circuit that will tell me in my house if it is running. I have in the past build and induction coil out of a transformer and then used an LED to light up when the pump is on. I cut out one of the side


Solar Charging Night Light not working

Started by Alberto in sci.electronics.basics2 years ago 24 replies

Hi all, I am trying to implement a very simple solar charged night garden light. Schematics is here:...

Hi all, I am trying to implement a very simple solar charged night garden light. Schematics is here: https://www.jameco.com/Jameco/workshop/JamecoFavorites/solarled.html Basically a solar panel charges a battery. When the solar panel output is low (at night), a joule thief circuit lights a led. The joule thief part works just fine, the problem is that the dark detector (2n3906 + 4.7K resis...


Flux density

Started by Tom Del Rosso in sci.electronics.basics2 years ago 8 replies

Reviewing stuff I forgot during lockdown, this is one thing I never got. H is amp-turns/meter, and having distance in the denominator suggests...

Reviewing stuff I forgot during lockdown, this is one thing I never got. H is amp-turns/meter, and having distance in the denominator suggests that it is also a measure of flux density (but without the core influences). So why is B defined as flux density, as if that distinguishes it from H? --


Checking capacitors

Started by Ralph Mowery in sci.electronics.basics2 years ago 10 replies

Today I received one of the roughly $ 20 component testers. Checking it out and comparing capacitors I notices a big difference in a...

Today I received one of the roughly $ 20 component testers. Checking it out and comparing capacitors I notices a big difference in a couple of them I was using a Fluke 87, a LCR meter from China, an older component tester and the new component tester. The first capacitor was a Sprague .06 uF 600V. Two China testers showed near the value. Within the 10% tollorence, The LC...


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