Latest threads in Hobby Electronics Basicsshow only best voted threads

Subject Author Posted Replies
 
DC motor reversing
Hi there I am no electronics geek And I am wondering whether it is possible to get a C motor circuit without relays (may be using transistors) Innocent
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Re: WHAT IS THE SPEED OF ELECTRICITY?
Electricity itself does not have a single "speed" in the way that physical objects do. Instead, electricity refers to the flow of electrons or other charged particles through a conductor, such as a...
 
Scope use question
I'd like to use both traces on my scope to look at 2 voltages that are without a common reference. E.g., across R1 & across R3: ________R1____ | R2 ... | R3 ____|______ I know that there are isolation...
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Power Calc
Okay, here's anohter dumb quesiton. Say I have a resistor across the mains power supply. Say its 10k for argeuments sake. Mains here is about 115VAC. So the resistor will disspate 1.3 watts give or...
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Resistors in parallel
Hi guys, I need to make up a 15k 4 Watt resistor from a selection of half Watt resistors in parallel. But the math is a bit complex for me. Any ideas how I could do this please? I'm relatively new to...
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New Motor Has Much Greater Torque/Power Than Old
Yet just using "throttle" [no pedal assist] doesn't seem much better. First and only theory: the torque sensor ripped apart after hundreds of miles of slip bang of the bad free wheel. I suspected this...
 
Altering PCBs
No way to pull over a heavy commercial vehicle after knocking off its tail light even if you wanted to so even though it must represent a small fraction of unreported minor accidents, freeways are...
 
Re: Splattering solder into eye?
On Saturday, October 25, 2008 at 11:57:30 AM UTC-4, Peter Hucker wrote: I am the unfortunate person in this situation. I have gotten solder splash in my eye, right in the center of my pupil in my...
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Email configuration for security camera
I was not sure which group to post this too, so this is the closest I could find. I have a security camera sold by Harbor Freight. It is a Cobra CCTV. This is what I am trying to set up for sending me...
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Testing small Transformer questions
I have a dead Ac/Dc adaptor. I'm busted it just to learns stuff. Im trying to learn how to test Transformers. This transformer says on it AMS10405 RG 1320F. I provide this to give all information,...
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Trying to understand math for Battery resistance ?
I’m working though understanding this description in this book. see attachment link below. I have tried this method for testing household batteries. I know there are other ways of testing batteries,...
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Ideas for a 12V brake light flasher circuit
Hi, I'd like to try and build a brake light flasher circuit for a motorcycle (12V). Brake light should flash 3-5 times then remain on (solid red). I'm new to electronics so not everything is clear to...
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Phone no longer charges
I have a Samsung S5 cell phone. It just now stopped charging. ?? I have tried at least 3 different charging cables, and 3 different chargers. I also removed the battery and did a factory reset. Anyone...
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How to know when to change battery in multimeter (2023 Update)
On my multimeter, the voltage readings get inaccurate over time due to battery discharge. My meters all use 9 volt batteries. How can I tell when to change out the batteries? Thanks.
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Recap On Absolute Cheapest Dummy Load
Eventually road 15 km against the wind in highest assist. The motor and refurbished battery were both uniformly warm. There were no hot spots on the battery in the one minute dummy load test so this...