Hobby Electronics Basics

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Formula for charging time of 12v battery

I have a Powerpack 300, which is a 12v battery at 12Ah. Using the AC adapter with the house outlet (20amp at 120v) it t...
28 comments posted 15yrs
posted by headbangerstudio
28 comments posted 15yrs posted by headbangerstudio

dvd persists

This is getting absurd. A stupid dvd player is locked to the mnc a
2 comments posted 15yrs
posted by kvsteve
2 comments posted 15yrs posted by kvsteve

TO1 Footprint

Hello, I need to make a footprint for a TO1 package but I can't find the pin spacing dimensions anywhere. All I can fin...
2 comments posted 15yrs
posted by jjkooner
2 comments posted 15yrs posted by jjkooner

AC fractional synchronous motor

I have a well-made vintage motor (used in a vintage professional chart recorder)and the motor is marked "Synchronous"....
14 comments posted 15yrs
posted by none
14 comments posted 15yrs posted by none

dvd circuitry

I have a expensive (dvp series) Philips dvd player that is locked to a specific region. It is locked so well that none...
8 comments posted 15yrs
posted by kvsteve
8 comments posted 15yrs posted by kvsteve

Einstein's Car Battery

After the recent threads about charging lead-acid batteries, this might be of interest: Seems that the reason lead-base...
1 comments posted 15yrs
posted by N0Spam
1 comments posted 15yrs posted by N0Spam

Please help me identify these PCB connectors

I need to replace a cable on a piece of equipment. The ends of the cable connect to PCBs using the type of connector I'...
7 comments posted 15yrs
posted by news
7 comments posted 15yrs posted by news

Power supply for LED array

Hi, I hope I'm in the right group to ask these two questions, so here goes... I'm building a lighting feature with 60 L...
5 comments posted 15yrs
posted by david.a.balch
5 comments posted 15yrs posted by david.a.balch

What kind of battery charger ?

I brought a Ansmann ALCS2-24A' auto voltage detacts charger from a shop " Element 14". I encounter a problem. My 6 volt...
28 comments posted 15yrs
posted by mowhoong
28 comments posted 15yrs posted by mowhoong

Yagi TV/FM Antenna--See Through Trees?

Is it possible for an antenna to see through a thicket of trees? I noticed a picture on a web site of a UHF antenna in a...
8 comments posted 15yrs
posted by wolftracks
8 comments posted 15yrs posted by wolftracks

TV Coax--300 vs 75 ohm

Don't TVs (analog) require 300 ohm coax? Can 300 and 75 be mixed? I went to use a old TV the other day that I had hooke...
12 comments posted 15yrs
posted by wolftracks
12 comments posted 15yrs posted by wolftracks

lenses and the 2nd law

This may be a dumb question, but anyway.... A lens focuses energy, does it not? That's its purpose. So given a large ra...
14 comments posted 15yrs
posted by r_delaney2001
14 comments posted 15yrs posted by r_delaney2001

duty cycle and sine waves

I was talking to a guy currently in college who had a lab in which he had to calculate the duty cycle of a sine wave. T...
11 comments posted 15yrs
posted by td_03
11 comments posted 15yrs posted by td_03