Hobby Electronics Basics

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4 PC printer ports

I'm wondering if there are any DIY projects for putting 4 parallel ports on an ISA or PCI card. I have a use for 4 port...
20 comments posted 20yrs
posted by randy.day
20 comments posted 20yrs posted by randy.day

half duplex

I was just wondering if half duplex Ethernet uses all four pins on the RJ45 plug (like full duplex). Thanks.
11 comments posted 20yrs
posted by mike7411
11 comments posted 20yrs posted by mike7411

mostly off topic - but an interesting link

http://www.freeenergynews.com/Directory/Engines/index.html The URL says it all - but there's a gem or two in amongst th...
0 comments posted 20yrs
posted by default
0 comments posted 20yrs posted by default

Capacitors and resonant frequency

I have a problem that asks about the movement of the second plate of a capacitor in order to change the resonant freque...
7 comments posted 20yrs
posted by meyousikmann
7 comments posted 20yrs posted by meyousikmann

input range on op-amp

I have a circuit that needs a comparator where the negative input will go 12 volts below ground intermittently. Standar...
5 comments posted 20yrs
posted by kellrobinson
5 comments posted 20yrs posted by kellrobinson

downconversion

If I wanted to downconvert a 2.4 GHz wireless signal into something I could run through an A/D converter, what is the ea...
3 comments posted 20yrs
posted by bob
3 comments posted 20yrs posted by bob

Lowering PS from 15 VDV to 12VDC

I finally found out the power supply requirements of my ITS 2000S. It is +12VDC, -12VDC, +5VDC. I found a PS that is cl...
7 comments posted 20yrs
posted by uriahsky
7 comments posted 20yrs posted by uriahsky

Digital automotive tach circuit?

Anyone have a simple digital tachometer schematic handy? I want to put a 4 digit LED tach into my van. Resolution of 50...
5 comments posted 20yrs
posted by dont.spam
5 comments posted 20yrs posted by dont.spam

Voltage Regulator to IC

If I am using a voltage regulator to bring a voltage down from 9 to 5 volts should I still put a capacitor before a TTL...
8 comments posted 20yrs
posted by Digitmode
8 comments posted 20yrs posted by Digitmode

Connection Car Radio to a computer Power Supply ?

Hey ! I'm trying to do that thing and I don't even know if it is possible ... Powering a car radio with a computer powe...
5 comments posted 20yrs
posted by nemzaroth
5 comments posted 20yrs posted by nemzaroth

microprocessor circuits

Hi ,I would like to do simple but interesting circuits using microprocessors Is it possible without a microprocessor tra...
16 comments posted 20yrs
posted by srvenkatraman
16 comments posted 20yrs posted by srvenkatraman

analog to digital coverter PCI card

I am looking for an analog to digital coverter PCI card that can do 10 million samples a second. Anyone know where to lo...
5 comments posted 20yrs
posted by bob
5 comments posted 20yrs posted by bob

RS422 flipping bits

I suspect a device I have is flipping bits before it sends out RS422 signals. I sent 3 capital A's out of it, and the o...
4 comments posted 20yrs
posted by bob
4 comments posted 20yrs posted by bob