Hobby Electronics Basics

Subwoofer help

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...

5 comments posted 6yrs

posted by scientist77017

5 comments posted 6yrs posted by scientist77017

Power in use indicator please ?

I have a water pump in a remote location. Sometimes the pump (120 volts) li ne springs a leak and then runs all the tim...

50 comments posted 6yrs

posted by stevwolf58

50 comments posted 6yrs posted by stevwolf58

Diagnosing speakers

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

16 comments posted 6yrs

posted by andrewkennedy775

16 comments posted 6yrs posted by andrewkennedy775

Checking capacitors

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

8 comments posted 6yrs

posted by rmowery28146

8 comments posted 6yrs posted by rmowery28146

Solar Charging Night Light not working

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

24 comments posted 6yrs

posted by alberto.m.scattolo

24 comments posted 6yrs posted by alberto.m.scattolo

Flux density

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

8 comments posted 6yrs

posted by fizzbintuesday

8 comments posted 6yrs posted by fizzbintuesday

Small generator over-voltage

If there's a better site/forum for this question, please let me know. I have an old (mid 80's) Sears Craftsman generato...

15 comments posted 6yrs

posted by BobEngelhardt

15 comments posted 6yrs posted by BobEngelhardt

Why does my server's redundant supply only have 12V?

It's an old Dell R410, with supplies DPS-500RB (12V only) and D480E-S0 (12/5/3.3V). If the second one died, the first on...

25 comments posted 6yrs

posted by CFKinsey

25 comments posted 6yrs posted by CFKinsey

Power supply current?

I wish to buy a power supply delivering up to 500V for experiments with thermionic valves. What would be a suitable curr...

24 comments posted 6yrs

posted by peterxpercival

24 comments posted 6yrs posted by peterxpercival

I got a box of old parts, any chance any of it is useful?

At a fundraising event I found a very nice wood box in the electronics section. It has what appears to be a broken deca...

7 comments posted 6yrs

posted by *

7 comments posted 6yrs posted by *

Transistor testing

I have some BC547 transistors which I want to use in a circuit, but according to this: Hook the positive lead from the...

15 comments posted 6yrs

posted by rob

15 comments posted 6yrs posted by rob

Wireless phone charger

Just for fun I thought I would make a wireless phone charger. I'm not reall y going to use it but I wanted to build it...

5 comments posted 6yrs

posted by stevwolf58

5 comments posted 6yrs posted by stevwolf58

Does a parrot's foot conduct electricity?

My pet parrot has a habit of chewing wires but never got a shock. I tested her feet with a multimeter and it was over 20...

63 comments posted 6yrs

posted by CFKinsey

63 comments posted 6yrs posted by CFKinsey

555 pin3 output

I've been trying out a couple of Automatic Fence Lighting circuits with a 444, 741 and ldr. I posted earlier about the...

4 comments posted 6yrs

posted by rob

4 comments posted 6yrs posted by rob

Problems with 12V and 5V lines on a PC ATX supply

Why do (cheap? expensive ones may be better) PC ATX power supplies need current drawn from the 5V line to make the 12V...

10 comments posted 6yrs

posted by CFKinsey

10 comments posted 6yrs posted by CFKinsey