Latest threads in Hobby Electronics Basicsshow only best voted threads
| Subject | Author | Posted | Replies | |
|---|---|---|---|---|
|
|
orbital shells and energy levels
High school and undergrad physics teaches that electrons change energy levels when they emit or absorb a photon. They also cover orbital shells (moreso in chem than physics). But they never draw a...
5
|
12 years ago
|
5 | |
|
|
How to clean button contacts of IR remote control?
I have an IR remote that needs cleaning since the buttons require excessive force to operate. I tried alcohol and a toothbrush on the circuit board where the buttons make contact, but it didn't last...
6
|
12 years ago
|
6 | |
|
|
equation: dBm to mW/cm^2
I have a 1 GHz 1/4 W whip driving a detector that outputs RF level data as a D.C. reading that is easily convertible to dBm. However I need the reading presented in mW / cm^2 I understand that my...
26
|
12 years ago
|
26 | |
|
|
Photon counting for the masses
Photon counting for the masses. Last Friday on SEB someone asked about the reverse bias voltages for LEDs. So I thought I=92d try and measure it. It turned out to be very interesting. The red LEDs...
395
|
12 years ago
|
395 | |
|
|
Difference in Coils for Electronic Ignition & Mechanical Ignition
A wiki article said some of the mechanical distributors could simply be swapped out with electronic ignition distributors. They didn't say if a new coil was necessary. Bret Cahill
6
|
12 years ago
|
6 | |
|
|
Major Differences In Small Engine Coils
Maybe the voltages vary somewhat for different point and plug gaps but is it enough to make any difference? . Supposedly Honda no longer makes the coils for their 100 outboard, a 2 cylinder 4 stroke...
7
|
12 years ago
|
7 | |
|
|
My Bad-My DELL
I know I'm in the wrong group but this is near my last resort. . . . .I just received a used Dell Optiplex GX280 Desktop and the thing won't power up. It appears the power switch is bad and it doesn't...
10
|
12 years ago
|
10 | |
|
|
Safe ground hookup
I wanna mess around with some LOPTs from CRT monitors, but wanted a reliable chicken stick (ground hook) to discharge caps, etc, first. I bought some 10awg sgl strand wire, a clamp, and a 18" L x 1"...
19
|
12 years ago
|
19 | |
|
|
Choosing a right High Guage Wire
Hi, I am looking for a hookup wire or a wire that can sustain somewhere between 20A and 400 Volts. I tried Digi key and some 10 and 12 AWG wire but the data sheets do not tell me that how much current...
10
|
12 years ago
|
10 | |
|
|
reverse breakdown voltage
Hi seb! I tried to measure the Vrbd of LEDs and found the resistance dropping: Vr R(MOhm) 3.18 244.6153846154 3.97 59.2537313433 4.23 48.6206896552 4.82 36.7938931298 5.65 27.5609756098 6.08...
20
|
12 years ago
|
20 | |
|
|
temperature for shrinking heat-shrink insulation
Looking at heatshrink insulation in catalogues, I typically see specifications like this: Operating temperature -20° to +135°C Shrink temperature 120°C Hot-air guns, however, always seem to have a...
12
|
12 years ago
|
12 | |
|
|
Full Bridge and Voltage Comparision
Hi, I am trying to compare the magnitude of the DC outputs of two full bridge rectifiers. The two rectifiers are getting inputs from two different sinusoidal sources of frequency 80 KHz who are in...
21
|
12 years ago
|
21 | |
|
|
Pinging Slow Man
Just in case you slip by TSA, we've established offensive measures within the family... Nice AR15 >:-} ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | |...
22
|
12 years ago
|
22 | |
|
|
Info Tech _Still_ Vastly Undervalued
You'd think they would have figured it out by now: Sometimes I wonder if maybe _all_ sustainability issues can be solved with applications of information technology. Bret Cahill
—
|
12 years ago
|
— | |
|
|
AA battery dead with debris
I have a one foot diameter clock with a AA battery. I noticed it had stopped. I looked at the back, and found white power had seeped out of battery. I don't think it's acidic, and I know the regular...
4
|
12 years ago
|
4 |