Pro Audio Design Forum

Well ignition switch was not the only leaky conduction path draining energy from the mag and making it hard to start. Last year I added a switch so I could disconnect the entire safety wiring harness (except the on/off switch) and even with the on/off switch cleaned up I still have balky start (i sm...

There is a laser based drum trigger, and if the drumhead was higher than the rim system (like tympani drums) a straight laser shot flush with the top surface could reveal the small excursion. I could bounce a laser off the drumhead at an angle and amplify the motion. I had a visual image of what I w...

I am ready to stick a fork in this... I got the strobe pretty bright and well behaved but see no standing wave. Then I converted my two speakers from series (16 ohm) to parallel (4 ohm) for more amplitude, and my battery eliminator PS crapped out from the extra current, so I beefed up the power supp...

OK, another chapter in my love/hate relationship with microchip... I like the parts but hate the documentation/support. Yesterday I got bit by a quirk in the software compiler (I think), but something that was working stopped for no apparent reason. I was re-purposing one of the micro pins that is u...

Inching forward... this morning I removed the guts from the cheapo DJ strobe, except for the LEDs... They used 21 in series with a 135V hot chassis power rail. I have reconfigured them into two banks of ten so I can bang with a lower PS. I rolled a quick 50V rail from an old +/-15V transformer using...

I feel like you are working a little too hard to amuse drummers - don't they usually amuse easier than that? Apparently being able to make their drum sound better isn't enough for many. I suspect the amplitude of the drumhead will be too small to make a good visual... I may need to amp up the power...

Yup the vibration modes in drumheads are very similar to speaker breakup. FWIW I already know what my lug mode looks like http://www.resotune.com/circle11.gif To clear lugs I set up this standing wave and synchronously detect the max output to be under the mic... When I adjust the lug tension the st...

Got the cheap LED DJ strobe in... Looks like it uses a hot chassis with 555 timer driving 21 LEDs in series. So I'll need to be careful. I have an opto triac left over from my DIY heater last winter.. Looks like i may need a different part since I want to cycle faster than 60 Hz.

JR

Stuff is still breaking and getting fixed, but this interesting (to me) one that was never completely fixed popped up again. last summer I replaced my lawnmower magneto and repaired some wiring issues to deal with balky starting behavior. My suspicion was a high impedance conduction path on the magn...

After my ethyl assisted review, it looks like I would need to build up a PCB to use the $4 LED chips to properly heat sink them so I need to first prove or disprove the general concept before doing specific production type engineering. Homedepot website didn't have any of those flood lights in stock...