Right. I should be seeing ~11 volts, not 6, after the triangular spike. The 17 volts is unregulated - but I can't see 15K knocking it down. I'll test that - just connect the 15K directly between ground and 17V and measure with the DMM.
Ed
Momentary Switch Circuit
Sep 08, 2005
44 Replies
Here are my latest and probably last test results:
formatting link
formatting link
BTW, it's possible that on some of my earlier tests, I had accidentally set my home-made power supply to its lowest current limit (about 25 mA).
Terry Pinnell
Hobbyist, West Sussex, UK
Here are my latest and probably last test results:
formatting link
formatting link
BTW, it's possible that on some of my earlier tests, I had accidentally set my home-made power supply to its lowest current limit (about 25 mA).
Terry Pinnell
Hobbyist, West Sussex, UK
The zener I was using is no good and now resides in the trash can. With a properly working 6 volt zener, I get the same waveforms as you. The expected ~11 volt level is there, the spike is there, and the mystery is solved. Damn thing tested good in series with 1K at 9 volts.
Ed
Great - glad we sorted that puzzle .
Terry Pinnell
Hobbyist, West Sussex, UK
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required