Hobby Electronics Basics

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12 v relay

is there a widely available 12 v time delay relay? what i need is a relay that will run between 30 seconds to 1 min, (o...
4 comments posted 21yrs
posted by dakota39l
4 comments posted 21yrs posted by dakota39l

total resistance in parallel circuits

I am new to electronics, and I've been learning the basics of ohm's law. I ran into the formula for finding the total r...
8 comments posted 21yrs
posted by jamie
8 comments posted 21yrs posted by jamie

Newbee: Optocoupler to BasicStamp

I am new to all this stuff an could use a little help. I am trying to determine the state of a MOC3010 Optocoupler usin...
18 comments posted 21yrs
posted by N
18 comments posted 21yrs posted by N

reflex tester game?

I've been wanting to build a fun reflex tester for my kids. I've got the basic idea of using a decade counter to light...
12 comments posted 21yrs
posted by robot
12 comments posted 21yrs posted by robot

Underwater battery charging contacts question

Hello, I read in a previous post about the induction method of charging an electric toothbrush. In my wanderings around...
12 comments posted 21yrs
posted by
12 comments posted 21yrs posted by

Inverter Amplifier Circuit

The Inverter CMOS linear amplifier in Figure 3.64 on page 158 in the book the art of electronics. The schematic seem to...
27 comments posted 21yrs
posted by diespammerdie
27 comments posted 21yrs posted by diespammerdie

Good Switcher

Any recommendations on a good, small switcher to go from 27volts to 5 volts @ 100ma. ----== Posted via Newsfeeds.Com -...
4 comments posted 21yrs
posted by rwskinnerATawesomenetDOTnet
4 comments posted 21yrs posted by rwskinnerATawesomenetDOTnet

Need a negative voltage

In an attempt to repair a presumably faulty preamp I realised the construction deals with two voltages; +14 and -14 (as...
3 comments posted 21yrs
posted by thegreatpain
3 comments posted 21yrs posted by thegreatpain

Help with simple circuit:

At least I think it is simple... I have 2 12v wingtip lights that I need to be able to control with one switch and one...
14 comments posted 21yrs
posted by MacGyver2
14 comments posted 21yrs posted by MacGyver2

help in making infra red light!

Hello, I hope this is the right place to post this message as I wish to know is it possible to make an infra-red flood...
5 comments posted 21yrs
posted by j.l
5 comments posted 21yrs posted by j.l

Oscilloscope primer rec?

Today I used an oscilloscope properly for the first time. It is a Tektronix 465B. The manual for this 'scope isn't that...
3 comments posted 21yrs
posted by etpm
3 comments posted 21yrs posted by etpm

Impedance of digital inputs

Would it be safe to say that ALL digital inputs (pins on microprocessors, microcontrollers, gates, etc.) are always hig...
21 comments posted 21yrs
posted by pdebella
21 comments posted 21yrs posted by pdebella

Series resistor for LED?

Anybody know a formula to work out the resistor needed for several series LEDs operating from a rectified AC source wit...
3 comments posted 21yrs
posted by wrongaddress
3 comments posted 21yrs posted by wrongaddress

luxeon led dimmer circuit

I've built the following circuit on breadboard as a dimmer circuit for 3 luxeon III Star ultrabright LEDs: http://www.n...
9 comments posted 21yrs
posted by news4
9 comments posted 21yrs posted by news4

Is this relay appropriate

I have a 120 VAC 1 hp motor that I want to control with a solid state relay because they are sealed. Looking at solid s...
5 comments posted 21yrs
posted by etpm
5 comments posted 21yrs posted by etpm