Hobby Electronics Basics

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Carbon microphone amplitude

Hi. I'm building a microphone amplifier and filter for a communication system for my motorcycle. I'm filtering away fre...
16 comments posted 20yrs
posted by RUNE_dahl
16 comments posted 20yrs posted by RUNE_dahl

decoupling capacitors

when using 9v battery as power source is decoupling capacitor still necessary Can anyone explain to newby purpose of de...
14 comments posted 20yrs
posted by magicbullet
14 comments posted 20yrs posted by magicbullet

PN Junction

Hi All, I have a question on the currents in the PN Junction diode. This has been bugging me for a lot of time. When th...
1 comments posted 20yrs
posted by beenuseren
1 comments posted 20yrs posted by beenuseren

Ground Loop isolator homebrew

I am looking for a simple circuit for eliminating ground loops on various audio circuits (max is headphone-type power,...
1 comments posted 20yrs
posted by cprstn54
1 comments posted 20yrs posted by cprstn54

Beginner transformer question

I'm looking for a transformer that is capable of stepping down 240V from the wall outlet to maybe less than 20V dependi...
16 comments posted 20yrs
posted by vcteo1
16 comments posted 20yrs posted by vcteo1

Simultaneous IR Object Detection and IR Control?

I am planning to build a robot that uses a Sharp GP2D120 for IR object detection. I would also like to control it using...
5 comments posted 20yrs
posted by redbrickhat
5 comments posted 20yrs posted by redbrickhat

PS 24 Volts for CPM2B

Dear, I want to make PS with 24 Volts regulated 50Watts for my PLC's. Please help me, how to cretae it, i beg you all t...
1 comments posted 20yrs
posted by ftjte97_east_pioneer
1 comments posted 20yrs posted by ftjte97_east_pioneer

Newbie: Trying to blink a LED using PIC

Can someone help me get started. I have been trying to blink a LED using a 16F88 all morning without any success. I am...
10 comments posted 20yrs
posted by N
10 comments posted 20yrs posted by N

spectrum of rectangular pulse

What do we mean by saying that the spectrum of rectangular pulse is sinc(x) function?
6 comments posted 20yrs
posted by papageorgiou40
6 comments posted 20yrs posted by papageorgiou40

Are UL or CSA approved wall warts enough?

Hi, The subject more or less says it all, my question is: "Is using a UL or CSA approved wall wart considered a safe, l...
8 comments posted 20yrs
posted by me
8 comments posted 20yrs posted by me

Best format to post schematics?

I've recently setup a web site www.myblueroom.com with a handful of schematics on it. Currently they (you click on the...
35 comments posted 20yrs
posted by wrichardson
35 comments posted 20yrs posted by wrichardson

stepper driver help!

So I've designed a translater using basic 74 series ttl gates. I've designed both a half and full step translater. I fi...
3 comments posted 20yrs
posted by Keiichi.McGuire
3 comments posted 20yrs posted by Keiichi.McGuire

Host interface

I've previously ask this question however i did not get a reply. I have a module that interfaces using; 1) MII PHY 2) G...
3 comments posted 20yrs
posted by vcteo1
3 comments posted 20yrs posted by vcteo1

cleaning and rehabbing a tek scope

Can anyone point me to a website that walks you through the details of cleaning and rehabbing an old scope that seems t...
7 comments posted 20yrs
posted by zeitguy
7 comments posted 20yrs posted by zeitguy