Hobby Electronics Basics

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LPT port input lines

Hi, I'm wonder if i can use lines INTR & WAIT of parallel port in EPP mode as controlled inputs. Three other lines are...
0 comments posted 19yrs
posted by arkadiusz.dawiec
0 comments posted 19yrs posted by arkadiusz.dawiec

Terminology for High Pass Filters

Hi all, for low pass filters, if i say the pass band is 0.15PI n stop band is 0.2PI, tat means freq btwn 0 to 0.15PI ca...
1 comments posted 19yrs
posted by PiaoChieh
1 comments posted 19yrs posted by PiaoChieh

Minimum load current

In the datasheets for regulators does a minimum load current represent the minimum current needed to turn on the regulat...
2 comments posted 19yrs
posted by Jon_Slaughter
2 comments posted 19yrs posted by Jon_Slaughter

DC/AC inverter

Is there any DC/AC inverter method that do not use big step up transformer? Regards,
6 comments posted 19yrs
posted by m.bandu
6 comments posted 19yrs posted by m.bandu

Efficient Speakers

From my other thread, I'm trying to arrange a very efficient solar/battery radio as a burglar deterrent while I'm away....
4 comments posted 19yrs
posted by spamfree
4 comments posted 19yrs posted by spamfree

Small Radio

Does anyone not reading my other thread have any ideas what the power drain would be for a very small radio? I basicall...
12 comments posted 19yrs
posted by spamfree
12 comments posted 19yrs posted by spamfree

5-transistor radio scheme?

Hi, folks. I recently got a 5-transistor (silicon) radio kit manufactured in UK. The kit has a printed circuit board an...
0 comments posted 19yrs
posted by dingd
0 comments posted 19yrs posted by dingd

Transformer drawing 1 amp

I have a transformer that is drawing about 1 amp when the secondary is not in use. Is this normal? Its a 15amp 12V CT t...
36 comments posted 19yrs
posted by Bob.Jones5400
36 comments posted 19yrs posted by Bob.Jones5400

Voltage dropper

Hi Folks I'm trying to run a tiny 6 volt radio for as long as possible off a 12 volt car battery. I came across a 7806...
3 comments posted 19yrs
posted by spamfree
3 comments posted 19yrs posted by spamfree

PIC12F675 Zero crossing

Hi, Which interrupt pin is the best to use zero-crossing interrupt for PIC12F675? Can i use any pin with Interrupt on C...
2 comments posted 19yrs
posted by m.bandu
2 comments posted 19yrs posted by m.bandu

NEED HELP! Simple DC circuit

What do I need? 555/556 Timer? Flip-Flop? I have a basic understanding of electronics, but most likely would not be abl...
6 comments posted 19yrs
posted by piscatory
6 comments posted 19yrs posted by piscatory

Hurrah!! Got my transmittor to work

I just got my first transmittor to work. I know this is small stuff to most of you, but I've only been studying electro...
6 comments posted 19yrs
posted by guitchess
6 comments posted 19yrs posted by guitchess

HDL - microcontroller

I am thinking to begin a project/study using HDL (VHDL or Verilog) to implement/simulate a microcontroller or a micropr...
3 comments posted 19yrs
posted by gethostbyname
3 comments posted 19yrs posted by gethostbyname

VCXO frequency isn't high enough

Hello all, I was playing around and saw that my junk box had all the parts so I started tossing this together: http://n...
58 comments posted 19yrs
posted by spam-not
58 comments posted 19yrs posted by spam-not

Getting started with USB

I have a project in mind to build a device with a USB interface. The device would store some data in an eeprom. There w...
6 comments posted 19yrs
posted by arhodes
6 comments posted 19yrs posted by arhodes