Hobby Electronics Basics

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UPS battery upgrade

Any fundamental reasons why I can't use the guts of my Tripplite 800 UPS with a larger external battery? JazzMan -- ***...
5 comments posted 21yrs
posted by No_Spam
5 comments posted 21yrs posted by No_Spam

Question about piezo buzzers

I want to build a circuit that outputs a 20kHz signal. I found this: http://www.geocities.com/tomzi.geo/whistle/whistle...
4 comments posted 21yrs
posted by
4 comments posted 21yrs posted by

Signal Delay in RC Network

Hi all, (Just for interest) I'm now studying something related to RC network delay. One of the ways (Elmore's) to calcu...
2 comments posted 21yrs
posted by chickenwing2010
2 comments posted 21yrs posted by chickenwing2010

differential mode noise

what causes differential mode noise..can u explain with reference any power converter...buck,boost any? how it is genera...
1 comments posted 21yrs
posted by krishmaniac
1 comments posted 21yrs posted by krishmaniac

OPAMP trouble

Hi, My opamp looks like it isn't amplifying and I need some help. I have a MCP606 opamp in a DIP package. I am inputtin...
7 comments posted 21yrs
posted by letron_2000no__spam
7 comments posted 21yrs posted by letron_2000no__spam

superflux leds

hey guys, can someone explain to me the difference between superflux leds and standard 2 pin led? why do superflux use...
1 comments posted 21yrs
posted by dakota39l
1 comments posted 21yrs posted by dakota39l

How to solder 30ga wire?

Attempting to repair a coil (mag guitar pickup) that's gazillion gauge enameled copper (probably 30ga - I'm guessing)....
4 comments posted 21yrs
posted by lumpy
4 comments posted 21yrs posted by lumpy

How bright would this be?

I am interested in high voltage and want to build a Marx Generator. the basic principle of a Marx Generator is that it...
2 comments posted 21yrs
posted by ngdbud
2 comments posted 21yrs posted by ngdbud

protection for chip

I need to protect a 555 timer circuit that I am going to install on my motorcycle. I'm not using a voltage regulator wi...
3 comments posted 21yrs
posted by kellrobinson
3 comments posted 21yrs posted by kellrobinson

toggle switch DPDT

Hello group, I have a toggle switch DPDT, and a plan to make some wiring. My question is : with 2 ON position for the t...
6 comments posted 21yrs
posted by jachardy
6 comments posted 21yrs posted by jachardy

digital electronics

hi I need to divide two 10 bit numbers.I would like to know if any kind of chip is readily available or what would be t...
6 comments posted 21yrs
posted by srinivasa.rangan
6 comments posted 21yrs posted by srinivasa.rangan

recharging a custom-made battery pack

Is it possible to recharge a custom-made battery pack? Details: I've used a four-AA batter case from radio shack to bui...
4 comments posted 21yrs
posted by esantoro
4 comments posted 21yrs posted by esantoro

Help replacing MFE201

Was looking at the AA-7 VHF preamp. Can't find an easily accessible MFE201 but think maybe (??) a pair of MPF102s would...
0 comments posted 21yrs
posted by logicon
0 comments posted 21yrs posted by logicon