Hobby Electronics Basics

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Constant voltage/current charging

Hi all, SLA battery often uses constant voltage charging, so overcharging is not an important consideration because cha...
0 comments posted 21yrs
posted by nospam4u_jack
0 comments posted 21yrs posted by nospam4u_jack

sequential?/combinational?

I have read a few different definitions of sequential and combinational and i still do not understand the difference be...
8 comments posted 21yrs
posted by for_england
8 comments posted 21yrs posted by for_england

Voice box

Hi I am planning to build a voice box which I would like to store approximately 10 different phrases, these would be pl...
5 comments posted 21yrs
posted by not.today
5 comments posted 21yrs posted by not.today

Opamp question

I was wondering why in an inverting opamp configuration, sometimes there is resistor from the + input to ground. The re...
5 comments posted 21yrs
posted by a-vinje
5 comments posted 21yrs posted by a-vinje

Does this pot exist?

--Howdy! I've been fiddling around with using a pot to position a "servo". I'm using the teeny weeny one from Parallax...
8 comments posted 21yrs
posted by steamer
8 comments posted 21yrs posted by steamer

Resistor Questions

Im a hobyest and I have a couple of questions. I was looking for a .39 ohm 1 Watt Resistor. I went to 3 places which al...
3 comments posted 21yrs
posted by Macdonald
3 comments posted 21yrs posted by Macdonald

phone lines

How can a two way conversation be transmitted along two wires of my residential phone line?. Why don't the signals conf...
7 comments posted 21yrs
posted by hartlyuk
7 comments posted 21yrs posted by hartlyuk

Car CD changer input

Question - how hard would it be to find the input legs of a CD changer input in the rear of an OEM Car radio? The kits...
1 comments posted 21yrs
posted by dan
1 comments posted 21yrs posted by dan

Why use an FET on battery charger output?

Hi, I'm working on a battery charger for a Palm Pilot. This fits inside the modem docking case, where space is limited....
4 comments posted 21yrs
posted by nospam
4 comments posted 21yrs posted by nospam

REQ: 12V Power Supply Help

hi all I've popped the top off my panasonic RX-ES27 stereo CD player http://www.clubic.com/photo/00032400.jpg I've loca...
1 comments posted 21yrs
posted by x
1 comments posted 21yrs posted by x

Transistor pins EBC

Can anyone confirm that when Im looking at the diagram of a transistor eg http://www.nteinc.com/specs/100to199/pdf/nte1...
3 comments posted 21yrs
posted by Macdonald
3 comments posted 21yrs posted by Macdonald

video camera battery q

It was my daughters birthday today, I put the video camera on charge for three hours before she got up. The camera only...
1 comments posted 21yrs
posted by roy
1 comments posted 21yrs posted by roy

Mic Pre-Amp Chips?

Hello all, Does anyone know if anyone makes a "chip" to do microphone pre-amplification? I know cobbling such a circuit...
7 comments posted 21yrs
posted by don
7 comments posted 21yrs posted by don