Hobby Electronics Basics

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What do the capacitors in this ducker circuit do?

Hello, about this picture: http://i14.tinypic.com/4pudydx.jpg I understand that OA1 is a threshold circuit using an opa...
10 comments posted 19yrs
posted by mr.whatever
10 comments posted 19yrs posted by mr.whatever

Velleman Kits

Say, Anyone ever assemble the Velleman Kits from Jameco? Namely stuff like radio transmitters and receivers:...
5 comments posted 19yrs
posted by blahbleh666
5 comments posted 19yrs posted by blahbleh666

inductor impedance - why no minus sign?

hola if an inductor has inductance L then the voltage V across it and the current I through it satisfy V = (-1) * L * d...
7 comments posted 19yrs
posted by sean_mcilroy
7 comments posted 19yrs posted by sean_mcilroy

care & feeding of deep cycle batteries

I just bought a 12V, 75 A-h deep cycle/RV battery from Wal-Mart ($45 + $9 core fee), with the intention of turning it i...
4 comments posted 19yrs
posted by mrdarrett
4 comments posted 19yrs posted by mrdarrett

revamping cell phone help

How do I deactivate the phone number inside an old model analog cell phone so that I can use it for 911 emergency calls...
4 comments posted 19yrs
posted by insula
4 comments posted 19yrs posted by insula

One-Electron-Thick Current

Hi: Is it possible to have an AC electric current that's 60 Hz, 5 volts, 0.01 amperes, and only 1-electron-thick? If 1-...
20 comments posted 19yrs
posted by glucegen1
20 comments posted 19yrs posted by glucegen1

OT truth in advertising

Reading packages of breakfast cereals in a store - great, I'm thinking, they are putting no sugar in these. Must be the...
130 comments posted 19yrs
posted by default
130 comments posted 19yrs posted by default

Barkhausen criterion and oscillation

The usual explanation of a feedback oscillator goes like this. ""We have an Amplifier 'A(w)', a feedback circuit 'B(w)'...
3 comments posted 19yrs
posted by manuvarkey
3 comments posted 19yrs posted by manuvarkey

5Vdc to 22Vdc: how?

Hi, for a small elektronic projekt I need to convert 5Vdc to 22-24Vdc at 100mA max. It has to be done on PCB and the ar...
3 comments posted 19yrs
posted by m.horemans
3 comments posted 19yrs posted by m.horemans

variable voltage switch?

Using an 18 V cordless circular saw, but for a different purpose than intended. Apparently the switch is either all or...
9 comments posted 19yrs
posted by jdoe
9 comments posted 19yrs posted by jdoe

Video Format Conversion?

Does anyone know of an easy way to turn anyone of these digital video output formats [ITU 656 8 bit /10), Y-CB-CR 4 : 2...
2 comments posted 19yrs
posted by XXbellis350
2 comments posted 19yrs posted by XXbellis350

something about transistos

hello everybody when i was looking for something about transistor i saw this group and i have just joined the group. i...
26 comments posted 19yrs
posted by ekremsari
26 comments posted 19yrs posted by ekremsari

12V relay surging

One problem here hopefully I can get this to work.. I wired a an automotive relay to drive a 12VDC RV water pump. from...
5 comments posted 19yrs
posted by jeremy_ho
5 comments posted 19yrs posted by jeremy_ho

using PC psu as power source

hi there, i need a 12v regulated power source to run approx 10 CCTV cameras (total should be 3 or 4amps max) which use...
19 comments posted 19yrs
posted by a
19 comments posted 19yrs posted by a