Hobby Electronics Basics

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Sallen and Key's classic 1955 paper

I am looking for the seminal paper by Sallen and Key entitled, "A Practical Method of Designing RC Active Filters." I a...
32 comments posted 16yrs
posted by wayne.little
32 comments posted 16yrs posted by wayne.little

Agilent DMMs?

I've owned & used Fluke DMMs and Tektronix scopes. I don't know much about the Agilent U1242A DMM. What's the history of...
7 comments posted 16yrs
posted by see
7 comments posted 16yrs posted by see

Broadband transformer center tap?

I want to use a transformer on the output of a DAC on a AD9834 DDS IC. Heres is a picture of using a transformer on the...
2 comments posted 16yrs
posted by spam
2 comments posted 16yrs posted by spam

Need a beeping device

Hi, I am looking for a component to control from a microcontroller to make a beeping noise, nothing to loud but to soun...
4 comments posted 16yrs
posted by johnathondev
4 comments posted 16yrs posted by johnathondev

Test equipment search

I have been wanting a particular test system from a company called ABI Electronics in the UK (WWW.ABIELECTRONIC.CO.UK)...
0 comments posted 16yrs
posted by uriahsky
0 comments posted 16yrs posted by uriahsky

AC coupled offset and gain problem

I am having trouble understanding the behavior of a circuit I am using to apply gain and offset to a triangle wave. The...
4 comments posted 16yrs
posted by unkown
4 comments posted 16yrs posted by unkown

How delicate is the output of a CMOS IC?

Are standard CMOS logic ICs any more susceptible to damage from external causes than BJT devices via the OUTput termina...
3 comments posted 16yrs
posted by pawihte
3 comments posted 16yrs posted by pawihte

Linear regulator

Hello HAs anyone ever tried to use a linear regulator to regulate a PWM signal? My situation: Input signal, 24V PWM 400...
5 comments posted 16yrs
posted by jonas.adiator
5 comments posted 16yrs posted by jonas.adiator

transistor astable multivibrator

Hi, when i make one of these using say 2n3904's and a couple of 10uf caps with a cycle time of about 1hz (r=100k approx...
8 comments posted 16yrs
posted by John
8 comments posted 16yrs posted by John

"6000 count" display?

Some DMM manufacturers state that the display of a meter is "6000 count" capacity. With all those 4 digits, the display...
6 comments posted 16yrs
posted by gloriasbest22
6 comments posted 16yrs posted by gloriasbest22

override timer in bathroom fan

Hi there I have a bathroom fan which turns on whenever the lights turned on. After the lights is off again it continues...
3 comments posted 16yrs
posted by nikolajkyndbyholm
3 comments posted 16yrs posted by nikolajkyndbyholm

Gerber files

I've been designing and making PCBs for my own use for almost 40 years now. The few times I needed more than a couple o...
5 comments posted 16yrs
posted by pawihte
5 comments posted 16yrs posted by pawihte

Signal Integrity for PCB Designers

Hello friends, Here is the tutorial on Signal Integrity available for free online. http://ezdia.com/Signal_Integrity_tu...
0 comments posted 16yrs
posted by addy.ind
0 comments posted 16yrs posted by addy.ind

How to make a flashlight reflector?

My powerful LED spotlight has a highly focused beam and I would like to make it more like a floodlight by changing the...
9 comments posted 16yrs
posted by jdoe
9 comments posted 16yrs posted by jdoe

Signal Integrity Quiz

Here are some set of signal integrity quiz taken from the book "Signal Integrity for PCB Designers" . See How many you g...
11 comments posted 16yrs
posted by addy.ind
11 comments posted 16yrs posted by addy.ind