Hobby Electronics Basics

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Advise identifying an IC?

Folks, I'm trying to identify a small 0.4 cm x 0.4 cm 6-pin DIP IC chip that has two rows of part numbers written on it...
1 comments posted 21yrs
posted by oth3ll0
1 comments posted 21yrs posted by oth3ll0

CCTV question

For a remote camera with a regular RCA type plug output do you think I could splice in CAT5 cable for the run? Would it...
4 comments posted 21yrs
posted by dan
4 comments posted 21yrs posted by dan

Question about pickit1 evaluation board

Pickit1 has 8 red leds which are controlled by RA1/2/4/5. I was just wondering if there is any special reason why the le...
1 comments posted 21yrs
posted by lessie
1 comments posted 21yrs posted by lessie

Help! Universal Adaptor Question

Hi, I just bought a portable handheld tv, the Casio TV-970, and want to purchase a universal adaptor for it. The univer...
9 comments posted 21yrs
posted by afritz
9 comments posted 21yrs posted by afritz

Trouble with 4x4 Telephone Keypad

Hi all, I'm making a 4x4 keypad for a DTMF dialer using on/off tactile switch. Problem is Row and Column has internal p...
18 comments posted 21yrs
posted by nospam4u_jack
18 comments posted 21yrs posted by nospam4u_jack

View Data On RS-232 Port

I am trying to modify and existing "lightning detector circuit" so that rather that going to another circuit that does...
2 comments posted 21yrs
posted by james.douglas
2 comments posted 21yrs posted by james.douglas

Intercom Question

I have an intercom that allows me to listen/talk to anybody in front of my door. There is a switch that allows the spea...
3 comments posted 21yrs
posted by puns
3 comments posted 21yrs posted by puns

Infrared remote control repeater circuit

I've built the circuit shown at the following link: http://www.mitedu.freeserve.co.uk/Circuits/Interface/irext5.htm How...
5 comments posted 21yrs
posted by jondoeengineer
5 comments posted 21yrs posted by jondoeengineer

555 question

Is it possible to use 555 to generate a pulse which triggers after every 24 hours. Am I looking at an RC time constant w...
17 comments posted 21yrs
posted by aman.bindra
17 comments posted 21yrs posted by aman.bindra

op amp output

Hello, I'm trying to make a thermostat circuit that uses an op amplifyer in voltage comparator mode. The circuit is her...
25 comments posted 21yrs
posted by frogfot
25 comments posted 21yrs posted by frogfot

Kettering Ignition Question

Hi, Most texts and web sites gloss over the secondary, or HT circuit, in an automotive points based ignition circuit. E...
2 comments posted 21yrs
posted by clive.jervis
2 comments posted 21yrs posted by clive.jervis

HOw to pulse a samll pen laser 650nm < 5mw

Greets, I was wondering if anyone knows how to pulse a small pen laser. or know of a circuit that will do it. TIA
1 comments posted 21yrs
posted by <sal
1 comments posted 21yrs posted by <sal

Help needed for simple circuit troubleshoot

G'day all :-) I am very much a beginner at this electronics lurk so I am hoping that someone can help me figure out wha...
5 comments posted 21yrs
posted by bullack
5 comments posted 21yrs posted by bullack

voltage to resistance convertor?

If I have a source of variable voltage ( a sweep generator for example), is there any way to create a source of varying...
14 comments posted 21yrs
posted by ask.me
14 comments posted 21yrs posted by ask.me