# Hobby Electronics Basics - Main Page

## The most recent discussions

### Original Equipment Needs To Shut Down Or Alert If the Circuitry Is Altered ...

October 17, 2019, 4:20 pm

Temperature might be one way of doing it. Any subsequent history of soldering would flag a problem. Board watching cameras might be the easiest cheapest way to preserve the integrity of a device. ... Read more »

### It Wouldn't Take Much Affer Marketry Circuitry To Mitigate This Problem

October 11, 2019, 4:03 am

No need to spend \$5K on a Powerwall. Home owners wif grid ties should be able to flip a switch when the utility goes AWOL. Then they can refreeze the cheese & meat in the refrigerator and charge up... Read more »

### wireless sensors

September 29, 2019, 2:06 pm

I bought a wireless inside/outside temperature/humidity display. I got to thinking about the outside sensor. I am almost sure the sensor does not transmit all the time because of only 2 AAA bat... Read more »

### Wanted: A 'joule thief' style circuit design...

September 29, 2019, 11:19 am

... that I can use to drain alkaline cells and push the 'charge' into either a lithium-Ion cell (for a flashlight), a phone or a powerbank. I have a combined wireless doorbell - inside/outside the... Read more »

### Colpitts oscillator

September 25, 2019, 10:48 am

Hi, I'm following instructions here (https://www.wikiwand.com/en/Colpitts_oscil lator#/Practical_example) to build a discrete components above MHz oscillat or. I could not find a 150nH inductance... Read more »

### Calculate run time of battery to a specified voltage

September 20, 2019, 10:14 pm

I want to calculate approx run time of a D cell with a capacity of 13,000 Mah. I assume that Time(H) = Capacity(Ah)/Current(A) equals a final battery voltage of 0 volts which will not work in my cas... Read more »

### LED RF Noise Evaluation

September 16, 2019, 10:39 pm

Hello, I have experienced what seems to be RF Noise that is generated from LED lighting. I don't have the exact spec's but just wondering if anyone here knows of what to look for as to packaging... Read more »

### Independence of Capacitance from Dielectric

September 14, 2019, 1:38 pm

Hi, A simple carelessness has caused the famous formula for the electrostatic p otential to be written wrongly while in its correct form we must use a term showing electrostatic field arising onl... Read more »

### All Ob A Sudden, Starter Motors Is So Small & Light You Can Carry 'em H...

September 10, 2019, 2:10 am

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 Nicolac... Read more »

### Will this work safely?

August 24, 2019, 7:12 pm

Pressing the door button of my commercial wireless door bell causes the mains-powered speaker unit in the hall to chime. Rather than buying another speaker unit I thought I'd make a simple extensio... Read more »

## The best rated discussions

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### Where to buy a small wheel hub motor?

Specifically, where can I buy a high quality small wheel hub motor (with wheel) like the one used for powered Trikkes? http://www.trikke.com/hd_2/Refurbished-Trikkes/Tribred-E-Kit-Upgrade http://www... Read more »

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### Satellite radio - radio validation

I'm curious, can someone provide a simple several paragraph, basic explanation of how satellite radio authentication works? eg. If the radio is only a receiver and I cancel my subscription how does ... Read more »

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### Max Frequency of SM 118A counter?

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Anyone know the maximum frequency of a Heathkit SM-118A? I have been all over Google with little luck. One guy said it would go to 1 GHz maybe 2 GHz, I don't think so. ... Read more »

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### Software for PIC 16F876

Hello, I want to built a simple datalogger with a PIC 16F876, and found a nice schema on the net. My problem: te software (source) is written in C, but i need a hex files to program the PIC processor... Read more »

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### Soldering Copper to Phosphor Bronze

Does anyone know if soldering copper wire to Phosphor-Bronze make a solid and reliable electrical connection? Would it make much of a difference if the copper wire is stranded or solid? If there is a... Read more »

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### Best Light for reading?

When choosing a Flourescent Bulb for a Task Light what is the best for reading.......my choices are 2700 Kelvin, 3000, 3500, or 4100..... Read more »

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### Thought experiment-will this work?

I think I pretty much understand how induction motors work. A typical single phase motor has a start winding that is approximately in quadrature electrically to the run winding. This provides the p... Read more »

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### How do you test a capacitor?

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Just bought a generator and it failed within two hours of usage. Mfg. say maybe capacitor and will ship a new one. But am not sure. I have a voltmeter with capacitor readings. Know how to test for re... Read more »

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### Electronic parts sites

I am looking for sites that sell electronic components. I have Jameco, but they don't have a lot of components. Thanks, Andy Read more »

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### UCANDO videos

If anyone has any old ucando videos on the subject of AC or DC or power supplies or amplifiers or any basic stuff and you want to sell them, at a resonable used price, I'd be interested. I'm just ... Read more »