Hobby Electronics Basics

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Power consumption of wall-wart power supply?

I'm using a circuit that takes 300mA from a wall-wart 9VDC linear unregulated power supply. What would be an estimate o...
4 comments posted 22yrs
posted by me
4 comments posted 22yrs posted by me

Parts Supply House suggestion

I'm going to build a very basic ultrasonic cleaning tank based on a 555 and using a piezoelectric tweeter (which I will...
5 comments posted 22yrs
posted by casteele95thbgheavy
5 comments posted 22yrs posted by casteele95thbgheavy

electronic dog whistle

Hi , Dose anyone know of a circuit for a annoying electronic dog whistle I could make. I am surrounded by 12 dogs with...
7 comments posted 22yrs
posted by shanekirkman
7 comments posted 22yrs posted by shanekirkman

Leaky zener diodes

Hi I've seen references in newsgroups to zener diodes that become leaky. Could someone explain this for me please. Gordo...
2 comments posted 22yrs
posted by welch
2 comments posted 22yrs posted by welch

R-2R ladder tolerances?

From time to time I think about building an R-2R ladder and drive it with some HCMOS buffer chip, and was wondering abo...
0 comments posted 22yrs
posted by null
0 comments posted 22yrs posted by null

Clamping high voltage?

Hello all, I've a friend who has enlisted my help in an area where I'm not too familiar. He has a power source that pro...
9 comments posted 22yrs
posted by tmh-SPAMISSPICEDHAM
9 comments posted 22yrs posted by tmh-SPAMISSPICEDHAM

A unconventional use for a NPN BJT

It is known that with a high value resistor, a capacitor and NPN transistor is possible to build a relaxation oscillato...
4 comments posted 22yrs
posted by email
4 comments posted 22yrs posted by email

How much current does a flashlight battery offer?

For the typical flashlight battery (AAA, AA, C, D), all of them are 1.5 volts, but how much current do they offer? (I'm...
21 comments posted 22yrs
posted by wylbur37nospam
21 comments posted 22yrs posted by wylbur37nospam

Need an Aussie to Build me something

Guys, I know a little about electronics (enough to be dangerous) but not enough to undertake a project that i need crea...
2 comments posted 22yrs
posted by craig.curtin
2 comments posted 22yrs posted by craig.curtin

Driving an LED

Hello Everyone, I am a novice in Electronic Design. I need to drive an LED depending on the signal I am getting out of...
3 comments posted 22yrs
posted by confused.mind
3 comments posted 22yrs posted by confused.mind

simple alarm system ideas?

hello. I would like to install a very simple alarm system. I've been reading a little about the professional models onl...
6 comments posted 22yrs
posted by sdfasdg
6 comments posted 22yrs posted by sdfasdg

Resin encapsulated modules

Is there a way to "melt" or remove resin from an electronic module? Kind regards, Gordon.
1 comments posted 22yrs
posted by gordon
1 comments posted 22yrs posted by gordon

IR CCD #2

I was talking with a guy a couple of months ago who told me about an OTC CCD by one of the japanese camera companies wh...
0 comments posted 22yrs
posted by john
0 comments posted 22yrs posted by john

Small 24v Ac motor with 3 wires - help!

I have a small AC motor which has 3 wires, the motor is rated at 8RPM 24V 60Hz, and should use a 12mfd capacitor. Can I...
0 comments posted 22yrs
posted by Who
0 comments posted 22yrs posted by Who