Hobby Electronics Basics

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replace UPS battery with same voltage but bigger

Say, can I replace my computer's UPS's "12V 7AH20HR" battery with a 12V 40AH (car) battery? Both are sealed, maintenance...
3 comments posted 20yrs
posted by jidanni
3 comments posted 20yrs posted by jidanni

Resistors getting hot

Hi I'm a bit of a novice, and I just tested the circuit below on a breadboard, and I find that the RL and R2 resistors...
14 comments posted 20yrs
posted by mmcnospam
14 comments posted 20yrs posted by mmcnospam

How do I calculate a battery internal resistance?

I am looking at various 9V rectangular batteries, notable Duracell. If I know the capacity in mAH, can I calculate the i...
2 comments posted 20yrs
posted by royalmp2001
2 comments posted 20yrs posted by royalmp2001

old telephone crank magneto

On our way back from her parents house Sunday in Houston, we decided to stop by a little antique mall somewhere between...
6 comments posted 20yrs
posted by ke5ckrIGNORECAPS
6 comments posted 20yrs posted by ke5ckrIGNORECAPS

"Electronic" 12V transformers for halogens

Easy question - please don't get turned off by all this text! =) I bought a 12V "Electronic" transformer for a 12V 50W...
0 comments posted 20yrs
posted by jst3712
0 comments posted 20yrs posted by jst3712

Transistor

Hi, I am new to this group..... I appreciate if you guys can help me with this question, I have look for the answer to...
4 comments posted 20yrs
posted by kilo_hrz77
4 comments posted 20yrs posted by kilo_hrz77

Narrowband FM Receiver circuit

Hi group, Can anyone tell me what it is in the circuit of a NBFM receiver that makes it different from that of a wideban...
10 comments posted 20yrs
posted by adrianhosking
10 comments posted 20yrs posted by adrianhosking

How to stop Piracy?

Several days ago, I got one call from my under-classmate in Notre Dame. Now he worked as the sales director in one famo...
5 comments posted 20yrs
posted by synkore
5 comments posted 20yrs posted by synkore

Winding own air core inductor

Hello, I have my own winding machine and lot of motor wire. Problem: There was a DOS based program available on net whi...
2 comments posted 20yrs
posted by yeshu26
2 comments posted 20yrs posted by yeshu26

Audio jammers

Hi.. I need some information on Audio Jammers. I have to implement Audio Jammers in MATLAB and then have to convert the...
0 comments posted 20yrs
posted by lovable.shruti
0 comments posted 20yrs posted by lovable.shruti

Soldering/desoldering batteries?

I have some 9.6V NiMH battery packs (originally for R/C use). Taking apart the plastic casing, I found eight AA-sized u...
5 comments posted 20yrs
posted by noreplies
5 comments posted 20yrs posted by noreplies

12 volt Mains adaptor - query re amps

The mains adaptor for my router (a Cisco Wireless-G WAG54G) has just died a death - the router's power requirements are...
5 comments posted 20yrs
posted by matt-hall
5 comments posted 20yrs posted by matt-hall

RPM of small DC motors

I have an automotive DMM with an inductive clamp to clamp a spark plug lead to measure RPM of an internal combustion en...
6 comments posted 20yrs
posted by johnriley11
6 comments posted 20yrs posted by johnriley11

pull up and pull downs

hiiii guys, I am new to this group and have read the discussion about pull up resistor. Its really good explained. My p...
4 comments posted 20yrs
posted by NishantZala
4 comments posted 20yrs posted by NishantZala