Search found 5 matches

by nkaufma
Wed Dec 03, 2003 3:07 pm
Forum: General Discussion
Topic: using an alarm clock to slowly turn on light
Replies: 9
Views: 1279

Re: using an alarm clock to slowly turn on light

The only part I'm not sure of yet is the output of the 555. What circuit can I design to ramp up the voltage on the gate of the SCR and control the ramp timing with a pot.
by nkaufma
Tue Dec 02, 2003 9:18 pm
Forum: General Discussion
Topic: using an alarm clock to slowly turn on light
Replies: 9
Views: 1279

Re: using an alarm clock to slowly turn on light

That would be great! Thanks
by nkaufma
Tue Dec 02, 2003 9:17 pm
Forum: General Discussion
Topic: testing continuity through capacitors
Replies: 5
Views: 749

Re: testing continuity through capacitors

A DC signal won't make it through an inline cap, or at least not enough current to light the LED. I'm grounding the wafer, putting a positive bias through the signal line which has a LED at the top, when the probe touches the wafer, the circuit it complete and the LED lights. The reason for reactanc...
by nkaufma
Tue Dec 02, 2003 5:27 pm
Forum: General Discussion
Topic: testing continuity through capacitors
Replies: 5
Views: 749

testing continuity through capacitors

I'm touching a few probes down on a wafer to test for continuity. I currently use a DC power supply which lights up LED's when the end is touched to the wafer. However, some lines may have an inline capacitor from 10pf to 100pf. The resistance needs to be around 15 ohms, which by calculations I woul...
by nkaufma
Tue Dec 02, 2003 2:28 pm
Forum: General Discussion
Topic: using an alarm clock to slowly turn on light
Replies: 9
Views: 1279

using an alarm clock to slowly turn on light

I would like to use the alarm output of my alarm clock to turn on an AC light slowly at a variable selected rate, similar to the sunrise alarm clocks. I was going to try using a 555 as a schmidt trigger, and then would have to use a scr on the output. Can somebody help me with this? Thanks