Latest threads in Hobby Electronics Basicsshow only best voted threads
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Why A DC to DC Converter Will Not Increase Range of the $3 Voltmeter Either
Guessing that there was no clever end run around the 30v maximum I tried a DC to DC converter set to 15v then measured the voltage between the +38v and the +15v. Instead of 23 v it jumped around all...
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10 months ago
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Why the $3 Voltmeter Cannot Work With Inline Resistance
The lowest voltage it can measure is what powers the LED display so something must be acting like a DC to DC converter set at the display voltage. Additional resistance in series lowers the current...
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11 months ago
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Cheap Voltmeter Doesnt Fry Over Voltage
It simply loses linearity. At least up to 38 v where it reads 36 v. Who cares?
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11 months ago
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Jus Run the Voltage Backwars Thru a 8 v Battery
The Fieri light runs on 4 rechargeable cells 2p X 2s. Just wire it so that the voltmeter always gets 8 volts less than the ebike battery.
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11 months ago
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220k Resistor Does Not Werk On 100 K Voltmeter
Hit just flashes. Furst guess is not enuff nano amps gits thru that yuge resistor. I ben very luky in that California no longer picks up toxik elektrikal stuff. But all I got is 2 resistors wif leads,...
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11 months ago
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Converting a $3 / 30v Voltmeter to A 45 v Voltmeter.
The impedance is 100k Ω. Put a 50 kΩ resister in series with the voltmeter and map out the correction.
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11 months ago
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Free Energy or Energy Storage
Hi Dears, I watched this video and I'm very curious if this is a really storage or fake. I know that free Energy don't exist but this energy storage is real? Video Youtube
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11 months ago
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by 90° in Capacitor ?
Many books told us that current leads voltage by 90° in capacitor. I have designed an experiment to show that it is true. Many books told us that current leads voltage by 90° in capacitor. I have...
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1 year ago
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Why are engineering sample CPUs illegal to sell?
Why are engineering sample CPUs illegal to sell?
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1 year ago
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How long to charge 9v nimh battery
I have a 9V 180 ma discharged Nimh battery that I am charging at 25ma. How long will it take to charge? Thanks, Andy
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1 year ago
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MOV Search
Hello, I am an Alarm Technician among other things or stuff. I was thinking about installing a simple MOV on the Transformer that feeds power to the Alarm Board. The industry standard is 16.5VAC 40VA...
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1 year ago
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DC motor soft start
I found this neat soft-start circuit on the eevblog forum. Its neatness is that the gate threshold voltage occurs immediately and then the RC softness kicks in. V+ ________________________ V+ | | 1M...
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1 year ago
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Potentiometer Project
I'm working on a custom project that involves potentiometers and picture adjustments on the monitor they are connected to. To determine whether or not the potentiometers I need exist or if I need to...
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1 year ago
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the fable of the diode
Once upon a time, there was a village called Diode. The inhabitants were an excitable lot, who tended to get charged easily, positively or negatively. They liked to play musical chairs. When a...
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1 year ago
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DC relay coil
I have a DC relay with the coil connections marked "+" & "-". Does it matter? The relay operates with either polarity so there is no internal flyback diode. It's a 24v, 33ma coil for those who want to...
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1 year ago
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