Hobby Electronics Basics

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resistence of 60W glow lamp

Today I experienced a strange fact. I took a glow lamp (classic home lamp 230 V, 60W) and I tested the resistence with...
5 comments posted 21yrs
posted by zooeb
5 comments posted 21yrs posted by zooeb

tapping rs485

Greetings I am trying to eavesdrop on a RS485 system. Four wire, TX+ TX- RX+ RX- and GND. I want to hook up my monitori...
1 comments posted 21yrs
posted by invalid
1 comments posted 21yrs posted by invalid

Ultrasonic range finding - components

Hi all, I want to build a simple ultrasonic range counter. I've got 400ST/400SR transducers. I found a simple schematic...
23 comments posted 21yrs
posted by danny
23 comments posted 21yrs posted by danny

Cascading shift registers

Call me a dumb but I cannot find any app notes on that. Are there any clock implications, is it the major concern? When...
10 comments posted 21yrs
posted by spam
10 comments posted 21yrs posted by spam

Sinking Output?

I have an application for a sensor that calls for a Sinking Output. I am not familiar with electronics. Can someone help...
2 comments posted 21yrs
posted by MROPARTNER
2 comments posted 21yrs posted by MROPARTNER

Op-amp propagation delay calculations?

Can anyone enlighten me as to how to calculate the propagation delays for a series of opamps driving a video signal? I...
2 comments posted 21yrs
posted by uvcceet
2 comments posted 21yrs posted by uvcceet

opamp circuit

anyone knows any good amplifier circuit...tnx
5 comments posted 21yrs
posted by static123ph
5 comments posted 21yrs posted by static123ph

Reversing motors

I've got little motors that change direction if you reverse the polarity. What's the best way to achieve this from a PI...
32 comments posted 21yrs
posted by danny
32 comments posted 21yrs posted by danny

General flash memory question

I'm interested in using a flash chip for some datalogging applications, however am not sure if it's practical to integr...
9 comments posted 21yrs
posted by dave.harper
9 comments posted 21yrs posted by dave.harper

About 555 mode of operation

> Hello > > What thing determines the mode of operation of LM555? For example if a 555 is > triggered externally it is...
3 comments posted 21yrs
posted by asdas
3 comments posted 21yrs posted by asdas

Why are white LEDs so expensive?

Does anyone know why white LEDs are so expensive? Looking through the Mouser catalog, I noticed that $2 a piece is a che...
13 comments posted 21yrs
posted by ThisIsNotMyReal
13 comments posted 21yrs posted by ThisIsNotMyReal

Converting A Cassette Recorder?

Can a cassette recorder be converted for variable speed playback?
3 comments posted 21yrs
posted by puns
3 comments posted 21yrs posted by puns

Using the Earth as a battery

Since the earth stores billions of electrons, is there any way the earth could be used as a usable battery? I guess its...
20 comments posted 21yrs
posted by hindian
20 comments posted 21yrs posted by hindian

Lowest draw "power on" indicator?

What "power on" indicator consumes the least current? An LED draws 20 mA. In a flasher circuit (LM3909) this can be red...
17 comments posted 21yrs
posted by cprstn54zz
17 comments posted 21yrs posted by cprstn54zz

Hands Free DIY Project

I would like to create an adapter which will allow the various "universal" hands-free cell-phone headsets on the market...
1 comments posted 21yrs
posted by googlemyass
1 comments posted 21yrs posted by googlemyass