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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.

That would be great! Thanks

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...

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...

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