Hobby Electronics Basics

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comparator problem

Hey I'm actually designing a comparator circuit |--------feedback resistor------| | | | |---------------------| | RC CI...
2 comments posted 22yrs
posted by yshashi
2 comments posted 22yrs posted by yshashi

Bias Transistor

Can someone point me to a good explanation of how, why, etc of biasing a transistor. I have been reading different book...
1 comments posted 22yrs
posted by james.douglas
1 comments posted 22yrs posted by james.douglas

Charger - Supply

Greetings, I am wondering if someone has or knows of anyone who has used a 12vdc charger as the foundation of a power s...
3 comments posted 22yrs
posted by aaawelder
3 comments posted 22yrs posted by aaawelder

Jingling key test and noise

There are two VHF (136-174MHz) radios and two UHF (438-470MHz) radios. For UHF radios, some kind of noise appeared at r...
10 comments posted 22yrs
posted by ahkit1021
10 comments posted 22yrs posted by ahkit1021

400v VS 400VRM

Im looking at two triacs one is 6A 400VRM TO-220 2N6343A other 6A 400 V TO-220 L4004L6 My simple question is What does...
1 comments posted 22yrs
posted by stacy
1 comments posted 22yrs posted by stacy

How to Use 2 Telephone HANDSETS as Intercom?

I understand how to use 2 telephones (USA) with 9v battery and resistor and possibly .47mfd cap across resistor to make...
7 comments posted 22yrs
posted by colklink
7 comments posted 22yrs posted by colklink

Bubble bar/wall - not a air stone

Okay - I've got a home made bubble etch tank that I think is pretty effective. That is until the other day when the bub...
7 comments posted 22yrs
posted by james
7 comments posted 22yrs posted by james

Homebrew power supply

Hey, Forgive me for the simplicity of this question but I'm rather new to electronics. I want to build a homebrew bench...
10 comments posted 22yrs
posted by mail.david
10 comments posted 22yrs posted by mail.david

PLL Frequency Synthesizer question

I would like to ask , how to divide 1MHz crystal frequency input frequency to 1kHz output frequency using divide by N co...
1 comments posted 22yrs
posted by j
1 comments posted 22yrs posted by j

Basic Frequency SynthesizerQuestion

If I put a SN7490(divided by five) IC in a Frequency Synthesizer PLL cirucit. Is it equal to input frequency * 5? Cheers
2 comments posted 22yrs
posted by j
2 comments posted 22yrs posted by j

identifying a panel meter

Hey all; I'm thinking about building a project that requires a 0-100mA panel meter. Being the packrat that I am, I have...
8 comments posted 22yrs
posted by toccata
8 comments posted 22yrs posted by toccata

extension cord on a reel

I have a 50 ft. 3 wire extension cord for use with an electrical leaf blower or weed eater outside. I normally keep the...
5 comments posted 22yrs
posted by jshamatcomcast.net
5 comments posted 22yrs posted by jshamatcomcast.net

Newbie question: Identifying Transistors

I recently purchased a 'grab bag' of components which included a bunch of transistors. Most of the transistors are what...
5 comments posted 22yrs
posted by googlegroup
5 comments posted 22yrs posted by googlegroup

120 Volts Micro Switch

Im an amateur/novice at electronics. Mostly I'm interested in electronics to fix things and make life a little easier a...
5 comments posted 22yrs
posted by news
5 comments posted 22yrs posted by news