Hobby Electronics Basics

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Comparator for sensor

Hi, I am building an application that needs to beep when the voltage output from the sensor device is less than 0.8 Vol...
12 comments posted 20yrs
posted by baskaran
12 comments posted 20yrs posted by baskaran

Transmission Gate question

I've been staring at a transmission gate circuit for a while trying to figure out how it works and I'm not making any p...
17 comments posted 20yrs
posted by angmor
17 comments posted 20yrs posted by angmor

555 RFI problem: reprise

Some weeks ago I asked for help with a car blinker circuit, that was prone to being affected by the (magneto) ignition...
4 comments posted 20yrs
posted by jwprincic
4 comments posted 20yrs posted by jwprincic

linear PS's

I'm building a PSU and I've got a 40VCT @.25A transformer. I want to have two outputs of +V1 and -V2 volts... i.e., two...
2 comments posted 20yrs
posted by Abstract.Dissonance.hotmail.co
2 comments posted 20yrs posted by Abstract.Dissonance.hotmail.co

Straight Forward Answers

I am not necessarily new to the hobby, i build a lot of pre-made schematics and kits and such. Now i am looking for an...
21 comments posted 20yrs
posted by dennisj.walter
21 comments posted 20yrs posted by dennisj.walter

Dual Power Supply

Hi! I have been trying to make a +15 0 -15 regulated power supply. I have been using a pair of LM 723C with TIP 3055 an...
6 comments posted 20yrs
posted by ramendra.roy
6 comments posted 20yrs posted by ramendra.roy

basics of transformer

I have a 40VCT .25A transformer and I'm wondering what those numbers mean.. does the 40VCT mean 40VAC from the center t...
6 comments posted 20yrs
posted by Abstract.Dissonance.hotmail.co
6 comments posted 20yrs posted by Abstract.Dissonance.hotmail.co

Basic resistance calculation

1) I know the formula for calculating total resistance but what if the other branch is empty? A -----+---+ | | | | R |...
6 comments posted 20yrs
posted by fakemail
6 comments posted 20yrs posted by fakemail

nixie clock example

Hi, I just add a new pic16f84a project in my web site : http://www.micro-examples.com/public/microex-navig/doc/150-p16f...
4 comments posted 20yrs
posted by noreply
4 comments posted 20yrs posted by noreply

LCD's

I brought some LCD's. One was a package(contained some circuits and stuff) and the other was simply the display itself...
4 comments posted 20yrs
posted by Abstract.Dissonance.hotmail.co
4 comments posted 20yrs posted by Abstract.Dissonance.hotmail.co

LDO AC analysis

hello could you tell me how to do AC open loop LDO simulation properly? how the inputs should be polarized when i open...
1 comments posted 20yrs
posted by jutek13NO_SPAM
1 comments posted 20yrs posted by jutek13NO_SPAM

Doorbell transformer to 7805?

I've built a 418MHz RF receiver into a Radio Shack project box together with a couple of relays. When I push one of the...
1 comments posted 20yrs
posted by jdege
1 comments posted 20yrs posted by jdege

LC oscillator

Hello, I am looking to do a LC or bank oscillator. I searched the internet I have not seen what I want. I just wanted a...
5 comments posted 20yrs
posted by lerameur
5 comments posted 20yrs posted by lerameur