Hobby Electronics Basics

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active devices and passive devices

i'm looking at the definition for active device "active device: A device that requires a source of energy for its opera...
2 comments posted 21yrs
posted by jameshanley39
2 comments posted 21yrs posted by jameshanley39

Solid State Relay Leak

Hi, I purchased a surplus Solid State Relay 10A 220 VAC to develop an AC Outlet controlled by the PC. I Design my hardw...
6 comments posted 21yrs
posted by brainchildme
6 comments posted 21yrs posted by brainchildme

EEPROM checksum error

What is the possible cause of EEPROM checksum error? Could magnetic field corrupt the EEPROM data? Any design guidelines...
28 comments posted 21yrs
posted by ahkit1021
28 comments posted 21yrs posted by ahkit1021

temeprature data logger

hi frends, iam new to this group, i just want to now do any one having 8 channel or 16 bit channel temperature data log...
1 comments posted 21yrs
posted by balakrishnavakamalla
1 comments posted 21yrs posted by balakrishnavakamalla

Time Delay Relay

A year or so ago someone on one of these groups told me how a time delay relay was the perfect solution to my problem....
2 comments posted 21yrs
posted by 1qazse4
2 comments posted 21yrs posted by 1qazse4

Cap identification

Someone gave me a bunch of capacitors. One of them has the following. SPAGUE (2) 8 D 100 UF 0-160VDC Then it has +> +>...
2 comments posted 21yrs
posted by Cretian
2 comments posted 21yrs posted by Cretian

low bias mosfets

Hi I am working on a project which requires low bias mosfets, about 3-5V. I am not having much luck finding any and I a...
2 comments posted 21yrs
posted by cwynnes
2 comments posted 21yrs posted by cwynnes

Low bias mosfets

Hi I am doing a project which requires low bias(3-5V) mosfets and I'm having trouble finding them. If anyone could help...
1 comments posted 21yrs
posted by cwynnes
1 comments posted 21yrs posted by cwynnes

Earth reference

When it is said that the Earth or Ground is used as a reference in an audio signal what is meant by that? I know that t...
1 comments posted 21yrs
posted by j.michael
1 comments posted 21yrs posted by j.michael

EAGLE Schematic and PCB layout software

I have been working on figuring this software out for a few days now. I can't seem to figure out how to tell it that I...
5 comments posted 21yrs
posted by 1qazse4
5 comments posted 21yrs posted by 1qazse4

Organic LED display

I need colour Organic LED display about 7" diameter for prototype work. any ideas where can I get them. thanks Padmow
2 comments posted 21yrs
posted by padmow_69
2 comments posted 21yrs posted by padmow_69

Three 12 volt transofrmers in series instead of one 38V?

Hi All, I have an audio power amp kit which requires me to connect an AC-AC 38 volt 5 Amp Transformer. I am having trou...
2 comments posted 21yrs
posted by NOSPAMsurjonesNOSPAM
2 comments posted 21yrs posted by NOSPAMsurjonesNOSPAM

Zener Minimum Current?

In a simple voltage regulator circuit, using a resistor and zener diode. The formula for the resistor in series with th...
12 comments posted 21yrs
posted by bellis350
12 comments posted 21yrs posted by bellis350

Diode - equivalent?

I need to replace a diode on an old PCB, the existing one being a 1N100 What's a suitable modern equivalent to this plea...
6 comments posted 21yrs
posted by max-man010
6 comments posted 21yrs posted by max-man010

Old Mags & Periodicals

Hi all. Call me old-fashioned if you like. It doesn't bother me, because I am! For many, many years I answered hundreds...
8 comments posted 21yrs
posted by tonysavage
8 comments posted 21yrs posted by tonysavage