DC powered Inductive Timing Light - Page 1
Forum section: electronics / beginners

author: davidbtamplen
author_rank: Newbie
timestamp: November 06, 2014, 10:10:31 pm
content: I have this 80's'ish craftsman Inductive timing light and have lost the cable assy.Im trying to make a new one but having trouble determining the pinout and there is no schematics online anywhere.if anyone has any suggestions please help.

author: davidbtamplen
author_rank: Newbie
timestamp: November 06, 2014, 10:14:41 pm
content: This is what I could gather from the board.but I'm not sure.

author: Paul Moir
author_rank: Frequent Contributor
timestamp: November 07, 2014, 12:24:23 am
content: I think you have it wrong. I get:Top (labelled positive in) - GNDGND+12vBottom (labelled Ground in) SignalReasons:It would make sense to cut power rather than signal with the trigger switch. Also I'm guessing that the component it runs into (hiding under big coil) is a power diode for reverse polarity protection. (It would be pretty inconsiderate to not have reverse polarity protection on a device that uses clamps for power hookup) The idea would be no current would flow through the diode if hooked up backwards by mistake.The bottom one runs through some high value / low wattage resistors setup as a divider into what looks an awful lot like a trigger circuit, and nothing else.If you find an inductive pickup for it, you may have to "tune" those resistors for the right sensitivity."Grounding" the case through that resistor makes some kind of sense.

author: davidbtamplen
author_rank: Newbie
timestamp: November 07, 2014, 01:29:50 am
content: Thank you for the response. The trigger is N-O. I would figure there would be a constant power for the caps since it is a strobe so I didn't think the power would be cut.

author: Paul Moir
author_rank: Frequent Contributor
timestamp: November 07, 2014, 04:26:17 am
content: When you have a big battery, charging the caps doesn't take long.I have a timing light that works that way. On the battery it's running in about 1/10th of a second.Is that a diode underneath the coil? If so does it point the right way?(Note: Changed "competent" to "component" in the previous reply. How the heck did that happen??)

author: davidbtamplen
author_rank: Newbie
timestamp: November 07, 2014, 05:03:17 am
content: There are 2 diodes I followed the one back to the the number 1 and 2 pin out.

author: xwarp
author_rank: Frequent Contributor
timestamp: November 07, 2014, 08:02:27 am
content: This may or may not help you:http://operatormanuals.tpub.com/TM-9-4910-696-14-P/TM-9-4910-696-14-P0013.htm

author: Paul Moir
author_rank: Frequent Contributor
timestamp: November 07, 2014, 06:09:58 pm
content: I meant what component is that underneath the coil (you can only see it's leads in your picture) that the trigger switch connects to?

author: davidbtamplen
author_rank: Newbie
timestamp: November 07, 2014, 06:11:45 pm
content: 2 diodes 3 caps and 2 resistors

author: Paul Moir
author_rank: Frequent Contributor
timestamp: November 07, 2014, 06:26:57 pm
content: Yes, I can see those fine. I meant the circled component:PS - check that red line. I see it going straight along the edge of the PCB into a pair of resistors, and then into the trigger transistor (or maybe SCR).