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Help with fundamental RF problem

Hello, I'm having trouble understanding a very fundamental question with respect to RF measurements. This I know: Rolle...
0 comments posted 22yrs
posted by kbubbar
0 comments posted 22yrs posted by kbubbar

Infra Red or LASER beam counter wanted

I would like to get something that would be able to count crates moving along a conveyer belt, something like where the...
6 comments posted 22yrs
posted by bouncer
6 comments posted 22yrs posted by bouncer

Capacitor ESR ??

I'm having trouble tracking down typical Capacitor ESR values for Aluminum and Tantalum electrolytics. Can someone poin...
40 comments posted 22yrs
posted by thegreatone
40 comments posted 22yrs posted by thegreatone

Driveway metal detector ?

Looking to build one to detect incoming traffic, like the traffic signals have. Any ideas to keep this simple?
5 comments posted 22yrs
posted by NFroehling
5 comments posted 22yrs posted by NFroehling

ultrasonic toothbrushes

Hi everybody! i need the schematics for this device, this is used in odontology for remove dental plaque, so please who...
4 comments posted 22yrs
posted by camilogil
4 comments posted 22yrs posted by camilogil

etching printed circuit boards

One of the problems with making your own printed circuit boards is the difficulty of legally disposing of spent etchant...
20 comments posted 22yrs
posted by ara
20 comments posted 22yrs posted by ara

LED to Sound...

Hello folks, I have a Telephone Caller ID unit with a Light Emitting Diode (LED) that flashes when someone calls me who...
5 comments posted 22yrs
posted by andy
5 comments posted 22yrs posted by andy

Question about Fmax (max oscillation frequency)

Hello, I have a quick question about the maximum oscillation frequency. I was reading earlier in a paper that the maxim...
1 comments posted 22yrs
posted by kbubbar
1 comments posted 22yrs posted by kbubbar

Convert Brinkman LED Flashlight to IR?

I have a Brinkman LED flashlite I want to convert to an IR led. A schematic of the Brinkman driver is here: http://edus...
3 comments posted 22yrs
posted by dcimperg
3 comments posted 22yrs posted by dcimperg

FA: The meager remnants of my junk bin

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3076691491&category=294&sspagename=STRK%3AMESSE%3AIT&rd=1 Thanks for...
2 comments posted 22yrs
posted by smoove
2 comments posted 22yrs posted by smoove

OT: Feynman videos

Some interesting lectures given by Feynman in 1979. They are an attempt to explain QED without all the complex mathemat...
1 comments posted 22yrs
posted by rcsurname
1 comments posted 22yrs posted by rcsurname

simm sockets

Hi all, I have a rightangle simm socket (72pin) which is mounted on a PCB, now the simm points to the right , which is...
0 comments posted 22yrs
posted by chris
0 comments posted 22yrs posted by chris

Spice Model Needed - Schottky Diode

Spice Model Needed - Schottky Diode - MBRS140 Thanks! ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Inn...
19 comments posted 22yrs
posted by thegreatone
19 comments posted 22yrs posted by thegreatone

IR remote controls and sensor

I am trying to source (ideally UK) a remote control unit (RC5 variety) to include teletext functions. Also a sensor to...
8 comments posted 22yrs
posted by fred
8 comments posted 22yrs posted by fred