Hobby Electronics Basics

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Timer Question

Anyone make an off-the-shelf timer that I can trigger and it'll run for X-hours then operate a relay? Or do I have to r...
15 comments posted 12yrs
posted by To-Email-Use-The-Envelope-Icon
15 comments posted 12yrs posted by To-Email-Use-The-Envelope-Icon

solar cell vs mili amps

does someone know the mili amps vs power vs short circut mili amps and can explane it to this dummy
3 comments posted 12yrs
posted by ken
3 comments posted 12yrs posted by ken

Simulating Power Bandwidth

I'm trying to do a simulation to show power bandwidth for a (high power) OpAmp versus compensation capacitor. In the la...
20 comments posted 12yrs
posted by To-Email-Use-The-Envelope-Icon
20 comments posted 12yrs posted by To-Email-Use-The-Envelope-Icon

distortion with Class B (with NFB) vs Class AB

I was shocked to see such low distortion figures on this Class B audio amplifier: http://www.redcircuits.com/Page164.htm...
45 comments posted 12yrs
posted by mrdarrett
45 comments posted 12yrs posted by mrdarrett

low-power audio amp basics

For some low-power audio amps, usually less than 2 Watts, I see the amplifier powered by +V and ground: http://www.redc...
14 comments posted 12yrs
posted by mrdarrett
14 comments posted 12yrs posted by mrdarrett

Creating sparks with a mosfet and ignition coil

I would like to generate a series of ~1000 volt sparks continuously, for several hours, using a spare automotive igniti...
29 comments posted 12yrs
posted by mrdarrett
29 comments posted 12yrs posted by mrdarrett

Why are FR4 copper clad PCB boards so expensive?

1 Kg of Copper costs around 6$ assuming you bought on the commodities marke t (per ton) however a PCB which is a thin l...
7 comments posted 12yrs
posted by vek.m1234
7 comments posted 12yrs posted by vek.m1234

How do you solder this?

I found this chip: http://www.ti.com/product/TPS60212 that will do all I need - step up 2v to 3.3v, very low quiescent...
2 comments posted 12yrs
posted by eather
2 comments posted 12yrs posted by eather

Which years for the 'current' ARRL Handbook?

I have a copy of AoE, but the other tome I hear recommended often is an ARRL Handbook. I know they pump a new edition o...
9 comments posted 12yrs
posted by guitardorkspamspameggsandham74
9 comments posted 12yrs posted by guitardorkspamspameggsandham74

OT: Length of the Meter?

I read the current definition of a meter is the distance light travels in 1/299,792,358 of a second. How did they come...
21 comments posted 12yrs
posted by bperryb
21 comments posted 12yrs posted by bperryb

Complex Math Question

Is this correct... I have a complex expression Numerator/Denominator where Numerator is the complex conjugate of the De...
3 comments posted 12yrs
posted by To-Email-Use-The-Envelope-Icon
3 comments posted 12yrs posted by To-Email-Use-The-Envelope-Icon

Any Oldtimers Want To Play "What Is This THing ?"

Here's one of those old things you just pick up because it's old. It is a "portable test oscillator". That much is no m...
8 comments posted 12yrs
posted by jurb6006
8 comments posted 12yrs posted by jurb6006